Cheap stepper motor couplings?

[AdrianhParticipant @adrianh95127]

Have a look at the Transmission Development web site, hardware section.

You could use a double UJ or a nylon sleeve coupling.

Better still would be a timing belt drive as you can have low backlash (Breco or Contiflex).

Prices from Trans Dev are very good. They sell a massive range of drive parts and bearings – mostly Chinese!

[Martin ConnellyParticipant @martinconnelly55370]

I agree with Adrianh. Timing belts make an easy set up. All that is needed to adjust the belt are slotted holes. You can have a 1:1 ratio on timing belt pulleys or increase or decrease the ratio. If top speed is not important because it is not a production environment then lower speed can give higher torque. If the stepper motors you are using are going to be open loop then higher torque is always better to avoid missed steps. Steppers with feedback, such as Leadshine hybrids, can give an error signal from missed steps but with open loop it is always a possibility. Timing belts also increase the options of the motor position relative to the leadscrew. This may not be a consideration for you but for people with restricted width setups it can be a bonus. The y axis motor can often be tucked under the table rather than having it stuck out in front.

Martin

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