Re: Shopbot, Rack and Pinion, Ball Screw, Acme precision screw?

Here's the url for oriental motors: www.orientalmotor.co.jp
They have the specs on the drives and the gears. I found out that
the one that the Shopbot uses the PN 7.2 reduction gear ratio and
the rack and pinions are Boston Gear pinions (20pitch;14.5deg
pressure angle).

I am finding out a bunch from the folks here and I am grateful. I am
pricing building a machine from very good parts, i.e. ball screws, to
not so good, rack and pinion. I think I will stick with stepper
motors though. I have read that the NEMA 42 and under are better
values for the money than servos. Over NEMA 42, go with servos.

> >Hi Wes,
> >
> >I'd watch the surplus and ebay channels for Oriental Motors (Vexta)
> >stepper/gearhead motors. I recall seeing ShopBot pix, and the
> >motors/gearheads looked like ones I've picked up. PH266 motors,
> >2GK7.5KA gearheads. Makes me want to build a router if I can use

my

> >parts!
>
> I've looked for the specs on the gearheads. I've got several
> PH66-01GK Vexta steppers with 2GK18KA gearheads. I've managed to
> crossreference the motors, and found the specs on the motors (I
> think), but the gearheads remain unavailable, spec wise...
>
> Any pointers?
>
> I'm thinking of driving the fine feed on a Grizzly Mini-mill with

one,

> I've got a Z axis DRO, so I'm less worried about backlash than
> otherwise.
>
> Harvey
>
>
> >
> >Alan KM6VV