Re: [CAD_CAM_EDM_DRO] making an ali flexible coupler

Graham,
If you go to www.mcmaster.com , and search for spider couplings,
you'll find what I used to connect stepper motors to the Proxxon shafts, and
they're pretty cheap. The rubber spider that's inserted between the two
coupling halves allows for misalignment. If I remember correctly, I had to
order the couplings with undersize holes, and drill them to fit the shafts.
If you have a problem, let me know, and I'll be glad to help.

Marv Frankel
Los Angeles

----- Original Message -----
From: "Graham Stabler" <eexgs@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, November 10, 2003 5:52 AM
Subject: [CAD_CAM_EDM_DRO] making an ali flexible coupler


> I am building a tiny CNC rotary table for my Proxxon milling machine
> and now have a small 60:1 wormwheel gearbox and a Nema11 stepper to
> turn it. What I now require is a flexible coupler to link the two.
> I could just use some flexible tubing and I could just buy one but I
> thought it might be nice to try and make one.
>
> I have one very small aliminium coupler I got off a DC motor some
> time ago. It has 6 slots cut into it, 3 in one direction and 3 in an
> orthogonal direction through the adapter. This allows it to flex in
> both directions easily. I think I can make these easily, I have nice
> thin diamond wheels and could program the mill to take nice gentle
> cuts at the correct heights and orientations.
>
> I have some larger couplers though that have two spiral cuts through
> the aluminium of the adapter so it is more like a spring in those
> sections. I have been reading about thread milling on the board
> recently but is that possible if the blank was held on the bed at the
> correct angle?
>
> Graham
>
>
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