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I am looking to make a constraint to animate a cnc model. So i want to have a given object travel along an axis as a result of the rotation of another screw and bolt.

To be specific a 360 degree rotation should move the child object 2mm limiting the rotations to 125 or 45 000 degrees for a total travel distance of 250mm.

Constraint should be able to work in both directions like a normal bolt and screw animation.

Thanks

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  • $\begingroup$ I am not optimistic that you will be able to make it "work in both directions". My first instinct matches Craig's: that you should use a driver. But then the target of the driver is the master and the object with the driver is the slave.. $\endgroup$
    – Mutant Bob
    Jul 21 '17 at 14:00
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Sounds like you need to set up a custom driver based on the rotation of the screw. This video is on corrective shape keys but is a good introduction to the use of drivers in animation https://www.youtube.com/watch?v=6mrceZ6fe-o

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Humane Rigging by Nathan Vegdahl may be your best bet for a truly deep understanding of rigs and constraints. It's also available on Youtube if you're strapped for cash, but you won't have the benefit of the tutorial rigs he provides.

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