Re: flexible couplings for PCB router - coupling

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<dave_mucha@...> wrote:

>
> I put a file in the files section. not too high deff.
>
> It shows how one can slot a connector to obtain some flexability.
>
> the key is that the only part that really flexes is at the inside
> diam, between the place the sections are joined.
>
> Use a samll dia cutter and you get long sweeping cuts. get a smaller
> dia and you get tighter bend.
>
> If you wanted to attempt a screw slot, the problem with those are

that

> they are springy.

Dave have you any photos or seen any that anybody actually made this
style?

I've played with a lot of flex couplings over the years, the rubber
spider style (oldham) are the cheapest, but they always seem to wear
out and develop a lot of backlash. They need the spiders replaced
periodically.

My favorite is the helical beam, but I have not seen anybody discuss
actually making one of them. The helical beam appears to be cut with
a saw cutter, like a threaded toolpath around the axis of the tube.

Rino is starting to sell some molded couplings that have the same
construction as your drawing:

http://www.rinomechanical.com/shftcoup_molded.htm

They don't publish prices, so they may want too much to make them a
viable alternative.

Also here is an article about couplings(with definitions) that may be
of interest:

http://tinyurl.com/mgcce

Fred Smith - IMService
http://www.cadcamcadcam.com/hobby