Welcome! Log In Create A New Profile

Advanced

5mm to 7.8mm shaft coupling?

Posted by Claghorn 
5mm to 7.8mm shaft coupling?
March 09, 2021 02:07PM
I didn't notice till today that the acme screws I got from openbuilds are actually 7.8mm in diameter, not 8mm. I have 5mm to 8mm shaft adapters for turning these screws as the Z drive on the printer I'm building, but tightening the screw on the adapter won't grab the 7.8 mm shaft. The adapter I have is a clamping style that has a screw which draws the sides of a slit together. Is there another style adapter that would work better? I've looked on Misumi and didn't find 7.8mm as an option, but there are lots of other style adapters. (Or I could get McMaster to make a couple to order for $300 or so :-). Would wrapping some aluminum foil around the end of the screw work? Or I just thought - maybe wrap some wire in the threads to make the end larger?

Edited 1 time(s). Last edit at 03/09/2021 02:11PM by Claghorn.
VDX
Re: 5mm to 7.8mm shaft coupling?
March 09, 2021 03:00PM
... get some 0,1mm steel-sheet and cut pieces to wrap them around the 7,8mm to get 8,0 smoking smiley


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]
Re: 5mm to 7.8mm shaft coupling?
March 09, 2021 03:32PM
Or cut shims from a beer can....


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: 5mm to 7.8mm shaft coupling?
March 21, 2021 04:08PM
I finally got back to this, and some strips from a can rolled around the screw thread worked great (sorry, it was a soda can, not a beer can :-).
VDX
Re: 5mm to 7.8mm shaft coupling?
March 22, 2021 02:02AM
smileys with beer


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]
Sorry, only registered users may post in this forum.

Click here to login