Turns out Helical Beam Couplers aren't meant to handle that much stress . . .

[AdamHeard]

Originally Posted by Monochron

Or should I say, this particular coupler from China isn't meant to handle so much stress.

We have been trying to dampen some of the vibration caused by a huge lead screw that we use to raise and lower our ball holder. Mounting with grommets and the like helped some, but still the vibration was intense and the noise was horrendous. So I had the bright idea to get some Helical Couplers and see if they couldn't absorb some of the movement.

Unfortunately, I was wrong:
https://drive.google.com/file/d/0B5a...it?usp=sharing

You are using these incorrectly.

You are relying on them to provide bearing support to the leadscrew (via the CIMs bearings) and they are not designed to do that. The end of the leadscrew should be in bearings properly in some structure, the CIM bolting to that, and then coupled with the beam coupler. The helical portion of the coupler then just handling shaft misalignment. They're also not really good at dampening vibration as they are intended to be stiff.