Ballscrew to Stepper Coupling?

[ZeroReciprocity]

Hi All,

Just wondered what style of coupling most people use/recommend when connecting their stepper motors directly to the ballscrew end?

Looking at those available on the BST Automation store of AliExpress, there seems to be 3 distinct types... Disc, Flexible and Jaw.
I'm wondering which is preferred to prevent any possible backlash?

Cheers

[mike-f]

Hi,

Well the slotted metal ones are the best regarding backlash but have a limited error of alignment allowance and do break if you fatigue them to much! the flexible jaw type with an insert are pretty good all-round but depending on the quality may introduce a small amount of backlash
it just depends on if you need Zero backlash or not?

[gd485]

Hi, I have tried various solutions to the problem and came to the conclusion that jaw type coupling ( plum coupling) works with the least hassle. Consideration of the required accuracy, bed size and inertia of the components affect the choice. The perfect solution would be a straight connection but in the real world it would be very difficult to align everything perfectly under dynamic load conditions. Good luck.

[Lee Roberts]

Oldham type every time, the other options (Jaw etc.) are for other applications of automation.

[gd485]

[QUOTE=Lee Roberts;134702]Oldham type every time

I’ve used them on 3d printer and found dove tail groove versions really good.

However, I’ve not found any to handle serious torque. My servos produce 20Nm and dynamic loads created by the inertia of heavy components may cause problems.