Re: [CAD_CAM_EDM_DRO] Looking for Coupler

And if you really want to splash out;

http://www.servometer.com/product.php?Id=3024



2010/1/12 gcode fi (hanermo) <yahoog@...>

>
>
> Most couplers are quite poor, actually.
> Including the "almost good" industrial ones at 40-50$ and more each !
>
> The problem is precision, under load, and wear.
> A coupler is a mechanical engineering challenge. It is not easy.
>
> The cheap ones will work, but will not be precise. For your use, it may
> not matter.
> The problem is , that the coupler should bend in two direcions (angular
> x and z) but should not move vertically, and should not change length in
> the x axis.
> The best solution to this are the oldham style couplers, with 3 piece
> construction, but they suffer from wear and usually bend under load.
>
> Thats why they are expensive ... if your needs are for mderate power,
> and around 1 degree resolution, the above may not be relevant or important.
>
> You can get one type, well made, aluminium, from Peter Homann in
> Australia at a decent price for the under 100W (ie stepper) territory.
> Homanndesigns.
> No affiliation etc. just a satisfied client. I have some and they are ok
> for stepper/low precision use.
>
> As an example, good couplers/precision motion requires repeatability in
> the 0.1 degrees to 0.001 degree or one thousandths of a degree.
> Timing belts work well for this use, upto about 0.01 degrees (for me).
>
>
> >
> >
> > Hey I am new to this group, so Howdy.
> >
> > I am looking for a supplier of Couplers, I wish to couple to a Stepper
> > motor a sprocket, so I am looking for 1/4 bore with 5/8 OD and about
> > an inch long, I have seen them at about $12 each but cannot see why
> > they woud cost more than a $ or 2.
> >
> > Thanks
> > Ray
> >
>
>

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