RE: [CAD_CAM_EDM_DRO] Re: flexible couplings for PCB router - coupling

HI Fred,

That's what I thought. How do you make a helical SAW cut? Just a simple
shallow angle for the blade? The blade probably wouldn't like it. Hard
enough to make a simple clean cut and worry about killing the blade!

These "stepped" helical cuts on the plastic couplers look do-able. Their
site must be new, it faltered on the form for the tech notes (AND, I'd just
filled out a form for a catalog!).

Alan KM6VV

> <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
>
>
>
>
>
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