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Yet another low-cost leadscrew coupling

by keegi, published

Yet another low-cost leadscrew coupling by keegi Jun 15, 2011
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Description

Coupling to connect M8 threaded rod leadscrew to 5mm stepper motor shaft.

(It seems Thingiverse lost the list of materials)
List of materials:
- 1-2cm of flexible tubing e.g. 4x6 or 4x7mm
- M8 coupling nut
- M8 nut for contra

Recent Comments

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I used Cristallo Extra PVC tube 4x7mm - one that was available in my local shop. http://www.hifitt.it/en/catalo...

This is so much smaller than the OEM coupler found in Prusa Mendels. I could gain a couple centimeters of x motion at z=10cm. Very cool. :-)

What type of tubing did you use in your coupler? The two I bought just bind up and tear when I try to thread the nut on.

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Tags

5/16, axis, cartesian, cheap, CNC, coupler, coupling, leadscrew, M8, motor, NEMA17, reprap, stepper, threaded rod

License

Yet another low-cost leadscrew coupling by keegi is licensed under the Creative Commons - Attribution - Share Alike license.

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Instructions

* slide the tubing on 5mm motor shaft
* thread one nut (or better yet, a coupling nut) onto the top of the tubing so that half of the nut is above the shaft
* thread another nut onto the threaded rod
* screw the rod onto the nut on the motor
* tighten the rod against motor shaft (but not too tight)
* tighten the nuts against each other

I used coupling nut on the picture for better grip, but it seems to work with regular nut as well.

I don't see a reason why this shouldn't work for 5/16" threaded rod as well.
Yet another low-cost leadscrew coupling by keegi is licensed under the Creative Commons - Attribution - Share Alike license.
By downloading this thing, you agree to abide by the license: Creative Commons - Attribution - Share Alike

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foxpup on Feb 12, 2013 said:

This is so much smaller than the OEM coupler found in Prusa Mendels. I could gain a couple centimeters of x motion at z=10cm. Very cool. :-)

TJSav on Jan 15, 2013 said:

What type of tubing did you use in your coupler? The two I bought just bind up and tear when I try to thread the nut on.

keegi on Feb 22, 2013 said:

I used Cristallo Extra PVC tube 4x7mm - one that was available in my local shop. http://www.hifitt.it/en/catalo...

thebaron88 on Apr 26, 2012 said:

Damn that's good. I looked at it and it looked a bit flimsy, but trying it its really good.

I attached the coupling and the nut to the rod, used pliers to hold the motor shaft, and screwed the two halves together.

Miro87043 on Jan 15, 2012 said:

This is great! I printed a few different z couplings, but I could never completely get rid of z axis wobble until I tried your solution.

Thanks for sharing!

ParallelPilgrim on Sep 12, 2011 said:

I used a lock washer to keep the coupling nut and hex nut together so the the threaded rod didnt accidentally get unscrewed.

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