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Symmetric Prusia Z-coupling

by fil, published

Symmetric Prusia Z-coupling by fil Sep 4, 2011
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License

GNU - GPL
Symmetric Prusia Z-coupling by fil is licensed under the GNU - GPL license.

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Summary

Couples a 5mm motor shaft to an 8mm threaded rod, ensuring they are coaxial, but allowing some angular movement if the rod is not straight. This version has the advantage of using two identical parts, rather than having a captive-nut side, and a smooth side. This means that one needs one fewer part type, which seems like a good idea, but it also ensures that the bolts balance one another.

As mentioned here: http://things.hands.com/thing/pla_coupling/ this version avoids the use of center=true, which seems to have been causing printing difficulties for some reason (as yet undetermined).

Oh, and it has round corners (it's mostly an intersection of a 'cube' and a cylinder)

Instructions

Place some plastic tubing over the motor shaft and then clamp it with M3x20 bolts

Alternatively (as mentioned in the comment by Pointedstick) one can reduce the diameter of the smaller radius hole to 2.5mm, and forget about the tubing, but this will of course reduce the suspension element of the design, so will presumably be less tolerant of bent rods.

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Nil, you had the same idea I had just as fast as I saw the original design. Why have two parts when one will do. Keeps the torsion balanced better. Good job!

Nil, you had the same idea I had just as fast as I saw the original design. Why have two parts when one will do. Keeps the torsion balanced better. Good job!

This model is wrong. The radius of the smaller curve is 3.5mm, which makes it 7mm diameter, not 5mm. It will not clamp onto a 5mm bar no matter how tight you screw it.

If you don't want to use a tube, just decrease the radius to 2.5. That's what I did.

Nevermind, just realized this is supposed to be used in conjunction with vinyl tubing.

Nevermind, just realized this is supposed to be used with rubber tubing.

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