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

Hi Dave,

Those Oldham couplings are a LOT cheaper then the Slotted Disk couplers I
was looking at.

59985K2 $8 each (2x), plus a $2 slotted disk. I wonder why so much more.
They are a similar price to the Helical couplers.

A slotted disk doesn't look too hard to make, 'tho.

Alan KM6VV

>
>
> I have not needed to make any as I have been very lucky to be able to
> use rigid on everything so far.
>
> I would make one if the need arose, but only to save the $5.00 the
> Oldham costs from McMaster Carr.
>
> 5/8" OD, 13/16" long 1/8" to 3/8" shaft
> 6408K9 $2.28 ea
>
> times 2, plus the spider.
>
> BUT... the torque on the spider is really low.
>
> The Rino ones are plastic and also have very low torque ratings.
>
> As for the helical beam, you do need to run the cutter around and
> 'thread' the cut. They are super flexible. the one beam style (you
> slit all the way past the bore and well into the opposite side, then
> rotate the part 180°, move down and repeat so the connection is on
> opposite sides) are also very flexible and would be MUCH easier to
> make than a helical. Flexibility becomes a function of number of cuts
> and thickness of the web.
>
> The dual beam I described offers less flexibility as the span of the
> flexing section is so much shorter.
>
> Dave
>