1 00:00:00,000 --> 00:00:28,440 I 2 00:00:28,440 --> 00:00:28,450 3 00:00:28,450 --> 00:00:31,450 okay we'll go into match drilling and 4 00:00:31,450 --> 00:00:31,460 okay we'll go into match drilling and 5 00:00:31,460 --> 00:00:33,310 okay we'll go into match drilling and fastener holes this is something that I 6 00:00:33,310 --> 00:00:33,320 fastener holes this is something that I 7 00:00:33,320 --> 00:00:37,180 fastener holes this is something that I touched on earlier which has to do with 8 00:00:37,180 --> 00:00:37,190 touched on earlier which has to do with 9 00:00:37,190 --> 00:00:39,190 touched on earlier which has to do with making sure that the holes match whether 10 00:00:39,190 --> 00:00:39,200 making sure that the holes match whether 11 00:00:39,200 --> 00:00:40,870 making sure that the holes match whether they're in their true position or not 12 00:00:40,870 --> 00:00:40,880 they're in their true position or not 13 00:00:40,880 --> 00:00:44,410 they're in their true position or not and by having a pilot hole in one part 14 00:00:44,410 --> 00:00:44,420 and by having a pilot hole in one part 15 00:00:44,420 --> 00:00:46,030 and by having a pilot hole in one part and then drilling all the way through 16 00:00:46,030 --> 00:00:46,040 and then drilling all the way through 17 00:00:46,040 --> 00:00:49,090 and then drilling all the way through with the mating pieces clamped in 18 00:00:49,090 --> 00:00:49,100 with the mating pieces clamped in 19 00:00:49,100 --> 00:00:52,479 with the mating pieces clamped in position this way you have a precision 20 00:00:52,479 --> 00:00:52,489 position this way you have a precision 21 00:00:52,489 --> 00:00:55,119 position this way you have a precision hole even if the holes are not in their 22 00:00:55,119 --> 00:00:55,129 hole even if the holes are not in their 23 00:00:55,129 --> 00:00:57,939 hole even if the holes are not in their troop positions because they can be off 24 00:00:57,939 --> 00:00:57,949 troop positions because they can be off 25 00:00:57,949 --> 00:01:00,160 troop positions because they can be off a little bit and still still be close 26 00:01:00,160 --> 00:01:00,170 a little bit and still still be close 27 00:01:00,170 --> 00:01:03,310 a little bit and still still be close enough and I have some examples of 28 00:01:03,310 --> 00:01:03,320 enough and I have some examples of 29 00:01:03,320 --> 00:01:08,020 enough and I have some examples of mismatched countersunk holes in the next 30 00:01:08,020 --> 00:01:08,030 mismatched countersunk holes in the next 31 00:01:08,030 --> 00:01:12,940 mismatched countersunk holes in the next figure now notice that this mismatch 32 00:01:12,940 --> 00:01:12,950 figure now notice that this mismatch 33 00:01:12,950 --> 00:01:17,410 figure now notice that this mismatch usually causes head bending which is bad 34 00:01:17,410 --> 00:01:17,420 usually causes head bending which is bad 35 00:01:17,420 --> 00:01:20,530 usually causes head bending which is bad news these these are cases in which see 36 00:01:20,530 --> 00:01:20,540 news these these are cases in which see 37 00:01:20,540 --> 00:01:22,690 news these these are cases in which see in the first one there the holes match 38 00:01:22,690 --> 00:01:22,700 in the first one there the holes match 39 00:01:22,700 --> 00:01:27,160 in the first one there the holes match the counter sunk is not in line so you 40 00:01:27,160 --> 00:01:27,170 the counter sunk is not in line so you 41 00:01:27,170 --> 00:01:29,020 the counter sunk is not in line so you have head bending where the era is up 42 00:01:29,020 --> 00:01:29,030 have head bending where the era is up 43 00:01:29,030 --> 00:01:32,679 have head bending where the era is up there the over here we even use the 44 00:01:32,679 --> 00:01:32,689 there the over here we even use the 45 00:01:32,689 --> 00:01:37,569 there the over here we even use the wrong counter snug hole and because 46 00:01:37,569 --> 00:01:37,579 wrong counter snug hole and because 47 00:01:37,579 --> 00:01:41,350 wrong counter snug hole and because there are two normal types 82 degree and 48 00:01:41,350 --> 00:01:41,360 there are two normal types 82 degree and 49 00:01:41,360 --> 00:01:45,219 there are two normal types 82 degree and 100 degree countersunk heads and so if 50 00:01:45,219 --> 00:01:45,229 100 degree countersunk heads and so if 51 00:01:45,229 --> 00:01:48,090 100 degree countersunk heads and so if you use the wrong one you're in trouble 52 00:01:48,090 --> 00:01:48,100 you use the wrong one you're in trouble 53 00:01:48,100 --> 00:01:51,490 you use the wrong one you're in trouble here we have the holes parallel but not 54 00:01:51,490 --> 00:01:51,500 here we have the holes parallel but not 55 00:01:51,500 --> 00:01:54,760 here we have the holes parallel but not in line and here the holes weren't even 56 00:01:54,760 --> 00:01:54,770 in line and here the holes weren't even 57 00:01:54,770 --> 00:01:56,590 in line and here the holes weren't even parallel so we're real trouble there on 58 00:01:56,590 --> 00:01:56,600 parallel so we're real trouble there on 59 00:01:56,600 --> 00:02:01,749 parallel so we're real trouble there on bending on both of these so what you 60 00:02:01,749 --> 00:02:01,759 bending on both of these so what you 61 00:02:01,759 --> 00:02:03,969 bending on both of these so what you have here is a case in which you need on 62 00:02:03,969 --> 00:02:03,979 have here is a case in which you need on 63 00:02:03,979 --> 00:02:07,060 have here is a case in which you need on countersunk holes to use the same drill 64 00:02:07,060 --> 00:02:07,070 countersunk holes to use the same drill 65 00:02:07,070 --> 00:02:09,609 countersunk holes to use the same drill fixture put all the holes in through 66 00:02:09,609 --> 00:02:09,619 fixture put all the holes in through 67 00:02:09,619 --> 00:02:12,040 fixture put all the holes in through everything so that at least even if it's 68 00:02:12,040 --> 00:02:12,050 everything so that at least even if it's 69 00:02:12,050 --> 00:02:17,260 everything so that at least even if it's a little bit off the 90-degree alignment 70 00:02:17,260 --> 00:02:17,270 a little bit off the 90-degree alignment 71 00:02:17,270 --> 00:02:20,170 a little bit off the 90-degree alignment at least everything will match and 72 00:02:20,170 --> 00:02:20,180 at least everything will match and 73 00:02:20,180 --> 00:02:21,760 at least everything will match and you're in better shape that way than you 74 00:02:21,760 --> 00:02:21,770 you're in better shape that way than you 75 00:02:21,770 --> 00:02:23,320 you're in better shape that way than you are if you have one of them drilled 76 00:02:23,320 --> 00:02:23,330 are if you have one of them drilled 77 00:02:23,330 --> 00:02:24,610 are if you have one of them drilled right and the other one drilled it a 78 00:02:24,610 --> 00:02:24,620 right and the other one drilled it a 79 00:02:24,620 --> 00:02:28,559 right and the other one drilled it a slight angle then you're in real trouble 80 00:02:28,559 --> 00:02:28,569 81 00:02:28,569 --> 00:02:31,980 now knife edges in a countersunk whole 82 00:02:31,980 --> 00:02:31,990 now knife edges in a countersunk whole 83 00:02:31,990 --> 00:02:35,170 now knife edges in a countersunk whole knife edges or stress risers and are to 84 00:02:35,170 --> 00:02:35,180 knife edges or stress risers and are to 85 00:02:35,180 --> 00:02:39,070 knife edges or stress risers and are to be avoided in fact the aerospace 86 00:02:39,070 --> 00:02:39,080 be avoided in fact the aerospace 87 00:02:39,080 --> 00:02:40,990 be avoided in fact the aerospace industry makes a big issue over this 88 00:02:40,990 --> 00:02:41,000 industry makes a big issue over this 89 00:02:41,000 --> 00:02:44,800 industry makes a big issue over this thou shalt not do it so if we go on to 90 00:02:44,800 --> 00:02:44,810 thou shalt not do it so if we go on to 91 00:02:44,810 --> 00:02:49,480 thou shalt not do it so if we go on to the next sheet it will show some 92 00:02:49,480 --> 00:02:49,490 the next sheet it will show some 93 00:02:49,490 --> 00:02:51,190 the next sheet it will show some examples of this and I can just talk 94 00:02:51,190 --> 00:02:51,200 examples of this and I can just talk 95 00:02:51,200 --> 00:02:58,440 examples of this and I can just talk from the examples there is a knife edge 96 00:02:58,440 --> 00:02:58,450 from the examples there is a knife edge 97 00:02:58,450 --> 00:03:03,670 from the examples there is a knife edge right here and you see that edge can be 98 00:03:03,670 --> 00:03:03,680 right here and you see that edge can be 99 00:03:03,680 --> 00:03:06,340 right here and you see that edge can be very jagged and developed cracks real 100 00:03:06,340 --> 00:03:06,350 very jagged and developed cracks real 101 00:03:06,350 --> 00:03:09,430 very jagged and developed cracks real easy so therefore you're not supposed to 102 00:03:09,430 --> 00:03:09,440 easy so therefore you're not supposed to 103 00:03:09,440 --> 00:03:11,550 easy so therefore you're not supposed to have that at all in a critical 104 00:03:11,550 --> 00:03:11,560 have that at all in a critical 105 00:03:11,560 --> 00:03:14,500 have that at all in a critical application you're supposed to make sure 106 00:03:14,500 --> 00:03:14,510 application you're supposed to make sure 107 00:03:14,510 --> 00:03:16,870 application you're supposed to make sure that you have enough thickness that you 108 00:03:16,870 --> 00:03:16,880 that you have enough thickness that you 109 00:03:16,880 --> 00:03:19,390 that you have enough thickness that you can counter sink and still have a piece 110 00:03:19,390 --> 00:03:19,400 can counter sink and still have a piece 111 00:03:19,400 --> 00:03:21,760 can counter sink and still have a piece left here to avoid that knife edge in 112 00:03:21,760 --> 00:03:21,770 left here to avoid that knife edge in 113 00:03:21,770 --> 00:03:26,949 left here to avoid that knife edge in fact having the countersink be no more 114 00:03:26,949 --> 00:03:26,959 fact having the countersink be no more 115 00:03:26,959 --> 00:03:30,070 fact having the countersink be no more than two-thirds of the thickness of the 116 00:03:30,070 --> 00:03:30,080 than two-thirds of the thickness of the 117 00:03:30,080 --> 00:03:33,340 than two-thirds of the thickness of the sheet is one of the criteria that the 118 00:03:33,340 --> 00:03:33,350 sheet is one of the criteria that the 119 00:03:33,350 --> 00:03:35,650 sheet is one of the criteria that the aircraft companies use then going to the 120 00:03:35,650 --> 00:03:35,660 aircraft companies use then going to the 121 00:03:35,660 --> 00:03:41,080 aircraft companies use then going to the next page now here we have dimpled and 122 00:03:41,080 --> 00:03:41,090 next page now here we have dimpled and 123 00:03:41,090 --> 00:03:43,660 next page now here we have dimpled and countersunk holes in this case we have 124 00:03:43,660 --> 00:03:43,670 countersunk holes in this case we have 125 00:03:43,670 --> 00:03:47,289 countersunk holes in this case we have the countersink in the bottom sheet we 126 00:03:47,289 --> 00:03:47,299 the countersink in the bottom sheet we 127 00:03:47,299 --> 00:03:49,060 the countersink in the bottom sheet we dimpled it just simply by hitting it 128 00:03:49,060 --> 00:03:49,070 dimpled it just simply by hitting it 129 00:03:49,070 --> 00:03:51,550 dimpled it just simply by hitting it with a tool to make this one fit so we 130 00:03:51,550 --> 00:03:51,560 with a tool to make this one fit so we 131 00:03:51,560 --> 00:03:54,160 with a tool to make this one fit so we could have a place surface up here and 132 00:03:54,160 --> 00:03:54,170 could have a place surface up here and 133 00:03:54,170 --> 00:03:56,410 could have a place surface up here and that's in in the case where you where 134 00:03:56,410 --> 00:03:56,420 that's in in the case where you where 135 00:03:56,420 --> 00:03:58,810 that's in in the case where you where the top sheet is too thin to countersink 136 00:03:58,810 --> 00:03:58,820 the top sheet is too thin to countersink 137 00:03:58,820 --> 00:04:01,060 the top sheet is too thin to countersink in it then we're both of them are too 138 00:04:01,060 --> 00:04:01,070 in it then we're both of them are too 139 00:04:01,070 --> 00:04:03,460 in it then we're both of them are too thin you can actually dimple both of 140 00:04:03,460 --> 00:04:03,470 thin you can actually dimple both of 141 00:04:03,470 --> 00:04:06,000 thin you can actually dimple both of them and still have a flesh surface now 142 00:04:06,000 --> 00:04:06,010 them and still have a flesh surface now 143 00:04:06,010 --> 00:04:10,680 them and still have a flesh surface now as I understand it this is still allowed 144 00:04:10,680 --> 00:04:10,690 as I understand it this is still allowed 145 00:04:10,690 --> 00:04:17,770 as I understand it this is still allowed mr. murky on small airplanes they still 146 00:04:17,770 --> 00:04:17,780 mr. murky on small airplanes they still 147 00:04:17,780 --> 00:04:20,620 mr. murky on small airplanes they still allow dimpling yeah Mario you put you 148 00:04:20,620 --> 00:04:20,630 allow dimpling yeah Mario you put you 149 00:04:20,630 --> 00:04:22,780 allow dimpling yeah Mario you put you fly so so this will this make you feel 150 00:04:22,780 --> 00:04:22,790 fly so so this will this make you feel 151 00:04:22,790 --> 00:04:25,450 fly so so this will this make you feel better they allow dimpled holes on small 152 00:04:25,450 --> 00:04:25,460 better they allow dimpled holes on small 153 00:04:25,460 --> 00:04:27,550 better they allow dimpled holes on small aircraft but they don't allow them on 154 00:04:27,550 --> 00:04:27,560 aircraft but they don't allow them on 155 00:04:27,560 --> 00:04:31,270 aircraft but they don't allow them on the big ones because the fact that where 156 00:04:31,270 --> 00:04:31,280 the big ones because the fact that where 157 00:04:31,280 --> 00:04:33,790 the big ones because the fact that where you deform the metal like that there's 158 00:04:33,790 --> 00:04:33,800 you deform the metal like that there's 159 00:04:33,800 --> 00:04:39,969 you deform the metal like that there's danger of developing cracks so so the 160 00:04:39,969 --> 00:04:39,979 danger of developing cracks so so the 161 00:04:39,979 --> 00:04:42,520 danger of developing cracks so so the the major aircraft manufacturers 162 00:04:42,520 --> 00:04:42,530 the major aircraft manufacturers 163 00:04:42,530 --> 00:04:47,800 the major aircraft manufacturers prohibit that now dowel pins there 164 00:04:47,800 --> 00:04:47,810 prohibit that now dowel pins there 165 00:04:47,810 --> 00:04:49,690 prohibit that now dowel pins there they're a very important thing and have 166 00:04:49,690 --> 00:04:49,700 they're a very important thing and have 167 00:04:49,700 --> 00:04:53,050 they're a very important thing and have an important function but sometimes 168 00:04:53,050 --> 00:04:53,060 an important function but sometimes 169 00:04:53,060 --> 00:04:54,550 an important function but sometimes people want to use them in way 170 00:04:54,550 --> 00:04:54,560 people want to use them in way 171 00:04:54,560 --> 00:04:57,040 people want to use them in way they shouldn't be used there are close 172 00:04:57,040 --> 00:04:57,050 they shouldn't be used there are close 173 00:04:57,050 --> 00:04:59,250 they shouldn't be used there are close tolerance pins which are used on lane 174 00:04:59,250 --> 00:04:59,260 tolerance pins which are used on lane 175 00:04:59,260 --> 00:05:02,340 tolerance pins which are used on lane mating components and that's really the 176 00:05:02,340 --> 00:05:02,350 mating components and that's really the 177 00:05:02,350 --> 00:05:05,020 mating components and that's really the their major function they usually 178 00:05:05,020 --> 00:05:05,030 their major function they usually 179 00:05:05,030 --> 00:05:07,330 their major function they usually mounted in what in one of the pieces 180 00:05:07,330 --> 00:05:07,340 mounted in what in one of the pieces 181 00:05:07,340 --> 00:05:10,720 mounted in what in one of the pieces with a slight interference fit then the 182 00:05:10,720 --> 00:05:10,730 with a slight interference fit then the 183 00:05:10,730 --> 00:05:13,000 with a slight interference fit then the meeting piece has a close tolerance hole 184 00:05:13,000 --> 00:05:13,010 meeting piece has a close tolerance hole 185 00:05:13,010 --> 00:05:15,310 meeting piece has a close tolerance hole the slip over it and you get good 186 00:05:15,310 --> 00:05:15,320 the slip over it and you get good 187 00:05:15,320 --> 00:05:17,710 the slip over it and you get good alignment of the pieces and then you 188 00:05:17,710 --> 00:05:17,720 alignment of the pieces and then you 189 00:05:17,720 --> 00:05:19,480 alignment of the pieces and then you bold them together or ever ever how you 190 00:05:19,480 --> 00:05:19,490 bold them together or ever ever how you 191 00:05:19,490 --> 00:05:22,000 bold them together or ever ever how you want to fasten together and you analyze 192 00:05:22,000 --> 00:05:22,010 want to fasten together and you analyze 193 00:05:22,010 --> 00:05:24,730 want to fasten together and you analyze the bolts for the total shear load and 194 00:05:24,730 --> 00:05:24,740 the bolts for the total shear load and 195 00:05:24,740 --> 00:05:27,670 the bolts for the total shear load and you don't use the dowel pins and bolts 196 00:05:27,670 --> 00:05:27,680 you don't use the dowel pins and bolts 197 00:05:27,680 --> 00:05:29,740 you don't use the dowel pins and bolts together to calculate the load because 198 00:05:29,740 --> 00:05:29,750 together to calculate the load because 199 00:05:29,750 --> 00:05:31,990 together to calculate the load because one of them is interference fit and the 200 00:05:31,990 --> 00:05:32,000 one of them is interference fit and the 201 00:05:32,000 --> 00:05:34,090 one of them is interference fit and the other one isn't so therefore the dowel 202 00:05:34,090 --> 00:05:34,100 other one isn't so therefore the dowel 203 00:05:34,100 --> 00:05:36,700 other one isn't so therefore the dowel pins would load up first so now if you 204 00:05:36,700 --> 00:05:36,710 pins would load up first so now if you 205 00:05:36,710 --> 00:05:38,200 pins would load up first so now if you want to put enough dowel pins in the 206 00:05:38,200 --> 00:05:38,210 want to put enough dowel pins in the 207 00:05:38,210 --> 00:05:39,940 want to put enough dowel pins in the carry all the load you could do that and 208 00:05:39,940 --> 00:05:39,950 carry all the load you could do that and 209 00:05:39,950 --> 00:05:41,500 carry all the load you could do that and then just hold them together with the 210 00:05:41,500 --> 00:05:41,510 then just hold them together with the 211 00:05:41,510 --> 00:05:44,110 then just hold them together with the intention with the bolts but you can't 212 00:05:44,110 --> 00:05:44,120 intention with the bolts but you can't 213 00:05:44,120 --> 00:05:47,560 intention with the bolts but you can't use two different fasteners that have 214 00:05:47,560 --> 00:05:47,570 use two different fasteners that have 215 00:05:47,570 --> 00:05:51,940 use two different fasteners that have different tolerances and say that both 216 00:05:51,940 --> 00:05:51,950 different tolerances and say that both 217 00:05:51,950 --> 00:05:53,290 different tolerances and say that both of them are going to carry load equally 218 00:05:53,290 --> 00:05:53,300 of them are going to carry load equally 219 00:05:53,300 --> 00:05:55,060 of them are going to carry load equally just like you don't use bolts and rivets 220 00:05:55,060 --> 00:05:55,070 just like you don't use bolts and rivets 221 00:05:55,070 --> 00:05:57,790 just like you don't use bolts and rivets together because the rivets would fail 222 00:05:57,790 --> 00:05:57,800 together because the rivets would fail 223 00:05:57,800 --> 00:05:59,320 together because the rivets would fail before the bolts pick up any load 224 00:05:59,320 --> 00:05:59,330 before the bolts pick up any load 225 00:05:59,330 --> 00:06:00,730 before the bolts pick up any load because the rivets and her parents fit 226 00:06:00,730 --> 00:06:00,740 because the rivets and her parents fit 227 00:06:00,740 --> 00:06:05,800 because the rivets and her parents fit the mold isn't so so that's that's the 228 00:06:05,800 --> 00:06:05,810 the mold isn't so so that's that's the 229 00:06:05,810 --> 00:06:08,440 the mold isn't so so that's that's the way that they're supposed to be used now 230 00:06:08,440 --> 00:06:08,450 way that they're supposed to be used now 231 00:06:08,450 --> 00:06:10,779 way that they're supposed to be used now you can design them to carry all the 232 00:06:10,779 --> 00:06:10,789 you can design them to carry all the 233 00:06:10,789 --> 00:06:12,490 you can design them to carry all the cheer load although normally you don't 234 00:06:12,490 --> 00:06:12,500 cheer load although normally you don't 235 00:06:12,500 --> 00:06:15,880 cheer load although normally you don't and now here's here's one of the things 236 00:06:15,880 --> 00:06:15,890 and now here's here's one of the things 237 00:06:15,890 --> 00:06:19,000 and now here's here's one of the things you can run into with dowel pins if you 238 00:06:19,000 --> 00:06:19,010 you can run into with dowel pins if you 239 00:06:19,010 --> 00:06:22,060 you can run into with dowel pins if you put them in blind holes they're kind of 240 00:06:22,060 --> 00:06:22,070 put them in blind holes they're kind of 241 00:06:22,070 --> 00:06:27,940 put them in blind holes they're kind of hard to remove so particularly if it's a 242 00:06:27,940 --> 00:06:27,950 hard to remove so particularly if it's a 243 00:06:27,950 --> 00:06:30,190 hard to remove so particularly if it's a solid pin so it's a lot better to have a 244 00:06:30,190 --> 00:06:30,200 solid pin so it's a lot better to have a 245 00:06:30,200 --> 00:06:32,680 solid pin so it's a lot better to have a through-hole to put a dowel pin in so 246 00:06:32,680 --> 00:06:32,690 through-hole to put a dowel pin in so 247 00:06:32,690 --> 00:06:34,330 through-hole to put a dowel pin in so you can take a punch to the back side 248 00:06:34,330 --> 00:06:34,340 you can take a punch to the back side 249 00:06:34,340 --> 00:06:39,820 you can take a punch to the back side and knock the thing out or use a vetted 250 00:06:39,820 --> 00:06:39,830 and knock the thing out or use a vetted 251 00:06:39,830 --> 00:06:42,640 and knock the thing out or use a vetted been with a groove or a flat edge for 252 00:06:42,640 --> 00:06:42,650 been with a groove or a flat edge for 253 00:06:42,650 --> 00:06:44,379 been with a groove or a flat edge for blind installations is to make sure you 254 00:06:44,379 --> 00:06:44,389 blind installations is to make sure you 255 00:06:44,389 --> 00:06:49,390 blind installations is to make sure you get the thing out and tapered dowel pins 256 00:06:49,390 --> 00:06:49,400 get the thing out and tapered dowel pins 257 00:06:49,400 --> 00:06:53,560 get the thing out and tapered dowel pins are available and pins with external 258 00:06:53,560 --> 00:06:53,570 are available and pins with external 259 00:06:53,570 --> 00:06:56,980 are available and pins with external serrations or ridges to prevent pin boat 260 00:06:56,980 --> 00:06:56,990 serrations or ridges to prevent pin boat 261 00:06:56,990 --> 00:06:59,260 serrations or ridges to prevent pin boat rotation so you drive the thing in place 262 00:06:59,260 --> 00:06:59,270 rotation so you drive the thing in place 263 00:06:59,270 --> 00:07:00,940 rotation so you drive the thing in place and it has the Russians on the edge of 264 00:07:00,940 --> 00:07:00,950 and it has the Russians on the edge of 265 00:07:00,950 --> 00:07:04,779 and it has the Russians on the edge of it that keeps it and rotating now sure 266 00:07:04,779 --> 00:07:04,789 it that keeps it and rotating now sure 267 00:07:04,789 --> 00:07:06,760 it that keeps it and rotating now sure allowables for dowel pins are usually 268 00:07:06,760 --> 00:07:06,770 allowables for dowel pins are usually 269 00:07:06,770 --> 00:07:07,690 allowables for dowel pins are usually determined by the 270 00:07:07,690 --> 00:07:07,700 determined by the 271 00:07:07,700 --> 00:07:09,730 determined by the manufacturers test program because a lot 272 00:07:09,730 --> 00:07:09,740 manufacturers test program because a lot 273 00:07:09,740 --> 00:07:11,560 manufacturers test program because a lot of the times the irregularity of the 274 00:07:11,560 --> 00:07:11,570 of the times the irregularity of the 275 00:07:11,570 --> 00:07:15,490 of the times the irregularity of the cross section means it is difficult for 276 00:07:15,490 --> 00:07:15,500 cross section means it is difficult for 277 00:07:15,500 --> 00:07:18,100 cross section means it is difficult for you to calculate the cross sectional 278 00:07:18,100 --> 00:07:18,110 you to calculate the cross sectional 279 00:07:18,110 --> 00:07:21,400 you to calculate the cross sectional area that you have so it's easier to use 280 00:07:21,400 --> 00:07:21,410 area that you have so it's easier to use 281 00:07:21,410 --> 00:07:24,700 area that you have so it's easier to use the manufacturers values for it so some 282 00:07:24,700 --> 00:07:24,710 the manufacturers values for it so some 283 00:07:24,710 --> 00:07:26,620 the manufacturers values for it so some of the common types of dowel pins that 284 00:07:26,620 --> 00:07:26,630 of the common types of dowel pins that 285 00:07:26,630 --> 00:07:35,400 of the common types of dowel pins that we have here is a plain solid one and 286 00:07:35,400 --> 00:07:35,410 we have here is a plain solid one and 287 00:07:35,410 --> 00:07:40,780 we have here is a plain solid one and pebble greened even this one is one of 288 00:07:40,780 --> 00:07:40,790 pebble greened even this one is one of 289 00:07:40,790 --> 00:07:43,030 pebble greened even this one is one of the ones that we Fred year since people 290 00:07:43,030 --> 00:07:43,040 the ones that we Fred year since people 291 00:07:43,040 --> 00:07:46,150 the ones that we Fred year since people made for me with some sort of a new 292 00:07:46,150 --> 00:07:46,160 made for me with some sort of a new 293 00:07:46,160 --> 00:07:48,160 made for me with some sort of a new system that they had gave it kind of a 294 00:07:48,160 --> 00:07:48,170 system that they had gave it kind of a 295 00:07:48,170 --> 00:07:52,720 system that they had gave it kind of a rough surface then we go to the drilled 296 00:07:52,720 --> 00:07:52,730 rough surface then we go to the drilled 297 00:07:52,730 --> 00:07:55,630 rough surface then we go to the drilled and tapped dowel pin with vents these 298 00:07:55,630 --> 00:07:55,640 and tapped dowel pin with vents these 299 00:07:55,640 --> 00:07:57,940 and tapped dowel pin with vents these are these even have little grooves 300 00:07:57,940 --> 00:07:57,950 are these even have little grooves 301 00:07:57,950 --> 00:08:00,040 are these even have little grooves around them so that they will vent and 302 00:08:00,040 --> 00:08:00,050 around them so that they will vent and 303 00:08:00,050 --> 00:08:02,590 around them so that they will vent and you can pull them out and then they have 304 00:08:02,590 --> 00:08:02,600 you can pull them out and then they have 305 00:08:02,600 --> 00:08:05,740 you can pull them out and then they have a drilled and tapped hole so that you 306 00:08:05,740 --> 00:08:05,750 a drilled and tapped hole so that you 307 00:08:05,750 --> 00:08:08,890 a drilled and tapped hole so that you can run a threaded rod in there of some 308 00:08:08,890 --> 00:08:08,900 can run a threaded rod in there of some 309 00:08:08,900 --> 00:08:10,750 can run a threaded rod in there of some kind or screw and actually pull the 310 00:08:10,750 --> 00:08:10,760 kind or screw and actually pull the 311 00:08:10,760 --> 00:08:20,290 kind or screw and actually pull the thing out with the ride here is a groove 312 00:08:20,290 --> 00:08:20,300 thing out with the ride here is a groove 313 00:08:20,300 --> 00:08:23,380 thing out with the ride here is a groove dowel pin and this one actually this 314 00:08:23,380 --> 00:08:23,390 dowel pin and this one actually this 315 00:08:23,390 --> 00:08:30,910 dowel pin and this one actually this this groove is on it to give it a little 316 00:08:30,910 --> 00:08:30,920 this groove is on it to give it a little 317 00:08:30,920 --> 00:08:34,240 this groove is on it to give it a little bit of compressibility you so this the 318 00:08:34,240 --> 00:08:34,250 bit of compressibility you so this the 319 00:08:34,250 --> 00:08:36,850 bit of compressibility you so this the grooved end would be slightly larger and 320 00:08:36,850 --> 00:08:36,860 grooved end would be slightly larger and 321 00:08:36,860 --> 00:08:39,790 grooved end would be slightly larger and that then you can pound it in and the 322 00:08:39,790 --> 00:08:39,800 that then you can pound it in and the 323 00:08:39,800 --> 00:08:42,040 that then you can pound it in and the groove will close up on some as you're 324 00:08:42,040 --> 00:08:42,050 groove will close up on some as you're 325 00:08:42,050 --> 00:08:45,460 groove will close up on some as you're pounding it in which is because you 326 00:08:45,460 --> 00:08:45,470 pounding it in which is because you 327 00:08:45,470 --> 00:08:47,320 pounding it in which is because you notice the groove doesn't go all the way 328 00:08:47,320 --> 00:08:47,330 notice the groove doesn't go all the way 329 00:08:47,330 --> 00:08:50,020 notice the groove doesn't go all the way down it is just it to one end then this 330 00:08:50,020 --> 00:08:50,030 down it is just it to one end then this 331 00:08:50,030 --> 00:08:54,250 down it is just it to one end then this is a vented dowel pin here and the 332 00:08:54,250 --> 00:08:54,260 is a vented dowel pin here and the 333 00:08:54,260 --> 00:08:56,380 is a vented dowel pin here and the groove does go all the way down so that 334 00:08:56,380 --> 00:08:56,390 groove does go all the way down so that 335 00:08:56,390 --> 00:08:58,300 groove does go all the way down so that you can get so she don't pull any vacuum 336 00:08:58,300 --> 00:08:58,310 you can get so she don't pull any vacuum 337 00:08:58,310 --> 00:09:01,590 you can get so she don't pull any vacuum when you put the thing in the blind hole 338 00:09:01,590 --> 00:09:01,600 when you put the thing in the blind hole 339 00:09:01,600 --> 00:09:05,550 when you put the thing in the blind hole now here's a tape that that I like and 340 00:09:05,550 --> 00:09:05,560 now here's a tape that that I like and 341 00:09:05,560 --> 00:09:08,320 now here's a tape that that I like and we use some of these because you can 342 00:09:08,320 --> 00:09:08,330 we use some of these because you can 343 00:09:08,330 --> 00:09:11,950 we use some of these because you can pull them this is the tapered dowel pin 344 00:09:11,950 --> 00:09:11,960 pull them this is the tapered dowel pin 345 00:09:11,960 --> 00:09:14,920 pull them this is the tapered dowel pin with a jacking net so that one you can 346 00:09:14,920 --> 00:09:14,930 with a jacking net so that one you can 347 00:09:14,930 --> 00:09:16,750 with a jacking net so that one you can slap it in the hole and then when you 348 00:09:16,750 --> 00:09:16,760 slap it in the hole and then when you 349 00:09:16,760 --> 00:09:18,250 slap it in the hole and then when you get ready to take it out all you got to 350 00:09:18,250 --> 00:09:18,260 get ready to take it out all you got to 351 00:09:18,260 --> 00:09:20,440 get ready to take it out all you got to do is tighten the nut up and that will 352 00:09:20,440 --> 00:09:20,450 do is tighten the nut up and that will 353 00:09:20,450 --> 00:09:21,509 do is tighten the nut up and that will pull it 354 00:09:21,509 --> 00:09:21,519 pull it 355 00:09:21,519 --> 00:09:24,699 pull it so those those are pretty pretty good if 356 00:09:24,699 --> 00:09:24,709 so those those are pretty pretty good if 357 00:09:24,709 --> 00:09:26,139 so those those are pretty pretty good if you if you've got a place where you can 358 00:09:26,139 --> 00:09:26,149 you if you've got a place where you can 359 00:09:26,149 --> 00:09:30,639 you if you've got a place where you can use them that way now roll pins are 360 00:09:30,639 --> 00:09:30,649 use them that way now roll pins are 361 00:09:30,649 --> 00:09:34,779 use them that way now roll pins are sometimes called spring pins are 362 00:09:34,779 --> 00:09:34,789 sometimes called spring pins are 363 00:09:34,789 --> 00:09:38,710 sometimes called spring pins are actually made by rolling a piece of thin 364 00:09:38,710 --> 00:09:38,720 actually made by rolling a piece of thin 365 00:09:38,720 --> 00:09:42,429 actually made by rolling a piece of thin alloy steel or stainless steel to a 366 00:09:42,429 --> 00:09:42,439 alloy steel or stainless steel to a 367 00:09:42,439 --> 00:09:44,559 alloy steel or stainless steel to a given diameter with a temper on each end 368 00:09:44,559 --> 00:09:44,569 given diameter with a temper on each end 369 00:09:44,569 --> 00:09:46,359 given diameter with a temper on each end of it so you can take a hammer and drive 370 00:09:46,359 --> 00:09:46,369 of it so you can take a hammer and drive 371 00:09:46,369 --> 00:09:49,989 of it so you can take a hammer and drive it in the hole it's then heat-treated a 372 00:09:49,989 --> 00:09:49,999 it in the hole it's then heat-treated a 373 00:09:49,999 --> 00:09:55,119 it in the hole it's then heat-treated a real high hardness and the coiled cross 374 00:09:55,119 --> 00:09:55,129 real high hardness and the coiled cross 375 00:09:55,129 --> 00:09:57,819 real high hardness and the coiled cross section on it decreases in diameter as 376 00:09:57,819 --> 00:09:57,829 section on it decreases in diameter as 377 00:09:57,829 --> 00:09:59,589 section on it decreases in diameter as you're driving it so that you have an 378 00:09:59,589 --> 00:09:59,599 you're driving it so that you have an 379 00:09:59,599 --> 00:10:03,279 you're driving it so that you have an interference fit now the slotted tubular 380 00:10:03,279 --> 00:10:03,289 interference fit now the slotted tubular 381 00:10:03,289 --> 00:10:05,289 interference fit now the slotted tubular pin is one that it's not really rolled 382 00:10:05,289 --> 00:10:05,299 pin is one that it's not really rolled 383 00:10:05,299 --> 00:10:08,079 pin is one that it's not really rolled up it's just a cylindrical piece of 384 00:10:08,079 --> 00:10:08,089 up it's just a cylindrical piece of 385 00:10:08,089 --> 00:10:10,659 up it's just a cylindrical piece of tubing with a slight cut in it and you 386 00:10:10,659 --> 00:10:10,669 tubing with a slight cut in it and you 387 00:10:10,669 --> 00:10:14,739 tubing with a slight cut in it and you can use that also SI spring pin so 388 00:10:14,739 --> 00:10:14,749 can use that also SI spring pin so 389 00:10:14,749 --> 00:10:16,869 can use that also SI spring pin so there's one of each shown on the next 390 00:10:16,869 --> 00:10:16,879 there's one of each shown on the next 391 00:10:16,879 --> 00:10:19,269 there's one of each shown on the next page here here is the roll pin which is 392 00:10:19,269 --> 00:10:19,279 page here here is the roll pin which is 393 00:10:19,279 --> 00:10:22,899 page here here is the roll pin which is wound up if you look at that one I 394 00:10:22,899 --> 00:10:22,909 wound up if you look at that one I 395 00:10:22,909 --> 00:10:24,759 wound up if you look at that one I believe you can see it better there that 396 00:10:24,759 --> 00:10:24,769 believe you can see it better there that 397 00:10:24,769 --> 00:10:27,279 believe you can see it better there that it's actually overlapped rolls of 398 00:10:27,279 --> 00:10:27,289 it's actually overlapped rolls of 399 00:10:27,289 --> 00:10:30,489 it's actually overlapped rolls of material so that it will develop more 400 00:10:30,489 --> 00:10:30,499 material so that it will develop more 401 00:10:30,499 --> 00:10:33,789 material so that it will develop more load of course than the single slotted 402 00:10:33,789 --> 00:10:33,799 load of course than the single slotted 403 00:10:33,799 --> 00:10:36,909 load of course than the single slotted tubular pin here these are used for 404 00:10:36,909 --> 00:10:36,919 tubular pin here these are used for 405 00:10:36,919 --> 00:10:41,739 tubular pin here these are used for installing cranks and I know that I've 406 00:10:41,739 --> 00:10:41,749 installing cranks and I know that I've 407 00:10:41,749 --> 00:10:44,349 installing cranks and I know that I've seen them used on bicycle cranks to hold 408 00:10:44,349 --> 00:10:44,359 seen them used on bicycle cranks to hold 409 00:10:44,359 --> 00:10:48,369 seen them used on bicycle cranks to hold them together and they're easy to tap in 410 00:10:48,369 --> 00:10:48,379 them together and they're easy to tap in 411 00:10:48,379 --> 00:10:49,809 them together and they're easy to tap in place and if they're in a through-hole 412 00:10:49,809 --> 00:10:49,819 place and if they're in a through-hole 413 00:10:49,819 --> 00:10:51,969 place and if they're in a through-hole then you can take a punch and knock them 414 00:10:51,969 --> 00:10:51,979 then you can take a punch and knock them 415 00:10:51,979 --> 00:10:56,340 then you can take a punch and knock them out when you get ready to take them out 416 00:10:56,340 --> 00:10:56,350 417 00:10:56,350 --> 00:10:58,989 the once again the load carrying 418 00:10:58,989 --> 00:10:58,999 the once again the load carrying 419 00:10:58,999 --> 00:11:02,079 the once again the load carrying capabilities for these are usually 420 00:11:02,079 --> 00:11:02,089 capabilities for these are usually 421 00:11:02,089 --> 00:11:04,329 capabilities for these are usually determined and tabulated by the pin 422 00:11:04,329 --> 00:11:04,339 determined and tabulated by the pin 423 00:11:04,339 --> 00:11:06,249 determined and tabulated by the pin manufacturer because due to the 424 00:11:06,249 --> 00:11:06,259 manufacturer because due to the 425 00:11:06,259 --> 00:11:08,049 manufacturer because due to the irregularity of the cross section it's 426 00:11:08,049 --> 00:11:08,059 irregularity of the cross section it's 427 00:11:08,059 --> 00:11:14,820 irregularity of the cross section it's hard for you to calculate it directly 428 00:11:14,820 --> 00:11:14,830 429 00:11:14,830 --> 00:11:18,640 and that will conclude roll pins in our 430 00:11:18,640 --> 00:11:18,650 and that will conclude roll pins in our 431 00:11:18,650 --> 00:11:21,790 and that will conclude roll pins in our next section when we come back we'll be 432 00:11:21,790 --> 00:11:21,800 next section when we come back we'll be 433 00:11:21,800 --> 00:11:25,540 next section when we come back we'll be on Ribbit's