Re: [CAD_CAM_EDM_DRO] flexible couplings for PCB router

my taig has oldhams, alan
and i make my own using weedwhacker nylon pins.
with the tools you have, direct drive is not out of
the question either!

--- Alan Marconett <KM6VV@...> wrote:

> Hi to the list,
>
> I'm designing and building a small PCB router,
> gantry style. Size is about
> 12" W x 12" L x 12" D. I'll be using stepper
> motors; this project was to be
> "from stock on hand". I salvaged a couple linear
> slides.
>
> I also found linear bushings and precision shafts on
> E-bay that look to do
> the job, I thought I might as well find commercial
> parts as well. The lead
> screws are another subject!
>
> I'm familiar with helical beam couplings (my CNC'd
> Sherline has them).
> Anyone ever use slotted disk couplings, also known
> as Oldham couplings?
>
> McMaster Carr under couplings:
>
> Hub 3/4" D. 7/8" L. 3/16" to 1/4" shafts. 59985K2
> $8.02, 2 ea.
> + disk 59985K62 $1.46 or 59985K92 $2.29
>
> Helical couplings:
> 3/4" x 3/4"; 3/16" to 1/4" 6208K4 $20.50
>
> Not cheap!
>
> McMaster says neither have backlash. The Oldham
> couplers would make it much
> easier to assemble/disassemble. Seem to tolerate
> similar miss-alignment.
>
> Looks like I'll be mounting the NEMA #23 steppers on
> short threaded rod. I
> really like the Sherline mounts, but other then
> using a piece of pipe for
> the standoff and LONG bolts, I don't have a similar
> design in mind.
>
> Alan KM6VV
>
>
>
>
>
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