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the mirrors on the james webb space

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telescope have components attached to

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the back of each of them what exactly

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are these and what do they do well we're

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here at ball aerospace in boulder

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colorado to find out

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so brad what's going on over here now

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well we are bonding items to the back of

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the mirror and that is to distribute the

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loads during launch as well as to

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distribute the lows during the mission

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and this is a precursor to more items

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being attached to the mirror right yeah

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that's correct

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the next step is when we attach the

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hexapod assembly and the radius of

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curvature subsystem onto the back of the

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mirror sounds like a mouthful i think

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it'd be better understood if we actually

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see one sure

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the hexapod assembly has the six rigid

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body actuators its job is to manipulate

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the mirror

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in six degrees of motion

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the radius the curvature subsystem it's

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one of the six struts and there is a

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an actuator that goes to the center of

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the mirror

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it can very precisely change the radius

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of curvature of the primary mirror

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because the mirror consists of 18

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primary mirror segment assemblies those

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18 primary mirror segment assemblies

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must be adjusted while on orbit to mimic

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a perfect primary mirror

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so brad can we take a closer look at

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these actuators talk to jake lewis and

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he will bring you up to speed with the

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actuators

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jake

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yes yeah brad brad told me that you are

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the man with the actuators absolutely

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so here we have the hexapod and we're

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aligning the actuators onto it a

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precision alignment fixture allows us to

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build each hexapod identically now that

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they've positioned the actuators on here

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they've got to verify that it's

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intolerance so they're measuring it to

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make sure that it's in the exact

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position that it needs to be you have

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different actuators for the different

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mirrors are they all the same no one of

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the things that we've done is that all

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of the mirrors have exactly the same

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actuators on them secondary tertiary all

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those just the secondary and primary

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mirrors have actuators the tertiary

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doesn't have any actuators on it it

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stays fixed but the only difference

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between the primary and secondary mirror

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hexapods is the size of the frame the

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actuator assembly all remains identical

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and that's a cost savings and a great

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simplification for us well thanks for

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giving us a sense of what actuators are

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on the james webb space telescope and

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the hexapod assembly you're welcome

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as you can see these actuators with the

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hexapod assembly make these mirrors on

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the james webb space telescope much more

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complex than the ones that say you might

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have in your bathroom but these mirrors

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have a job to do to look at a universe

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billions of light years away