[chmedly]

I'm trying to figure out who manufactured this motor coupling. It's 2" long and 2" in diameter. The bore in one end is 12mm. The other is 14mm. I can't find any beam slit couplings from any of the major manufacturers that are both 2" (or 50mm) diameter AND 2" long.
Attachment 401844

[john-100]

this may get you started :-

https://docs-emea.rs-online.com/webd...6b80f6d673.pdf

John

[Jim Dawson]

Automation Direct sells a 2x2 beam style, but they don't have any reducing bushings that small for that unit, but you could make your own reducing bushings. https://www.automationdirect.com/adc.../DC-SBS51-1616

[awerby]

If it's aluminum, throw it out. They aren't suitable for CNC use, and break in short order. The stainless ones will last longer, but not as long as 3-part couplings.

[chmedly]

this may get you started :-

https://docs-emea.rs-online.com/webd...6b80f6d673.pdf

John

Hmm. I don't see any couplings in that doc over 32mm in diameter or 39mm length. Is there another page I'm not seeing?

[chmedly]

If it's aluminum, throw it out. They aren't suitable for CNC use, and break in short order. The stainless ones will last longer, but not as long as 3-part couplings.

I appreciate the warning. And it's one I've heard before. But I have to wonder if this bad luck isn't because of some other factor than them being aluminum. If they are underspecified in terms of torque or if they are taking up too large of a misalignment then that could explain premature failure. I understand that slit beam couplings are especially unforgiving of axial movement. I would be curious to hear more of your experience.

This particular coupling is particularly large in diameter. This implies extra strength. Since couplings in this size range are generally over $100, and I have one in my possession already, I was thinking to see how much another one would cost. I need two for my CNC application.

[Al_The_Man]

I agree on the stainless over aluminum, I would use aluminum for encoder coupling, but not for motor/drive shaft, check out Misumi for a range of couplings. (and other hardware).
Al.