Re: $250 machine pics

--- In CAD_CAM_EDM_DRO@yahoogroups.com, John Dammeyer <johnd@a...> wrote:

>
> Hi John,
>
> Thanks. One of the problems I ran into was coupling the leadscrew

to the

> motor. Since my system was purely for positioning and not milling I

made a

> coupler that was threaded on one end to the same pitch as the screw.

The

> other side presses onto the motor shaft and is held in place with a
> setscrew. A locknut prevents the leadscrew from unwinding. The Stepper
> bearings are used to hold things in place. (not the best I agree).
>
> I've posted a photo at http://www.autoartisans.com/cnc/leadscrew.jpg
>
> I've never really been able to get a decent connection with this coupler
> method. How did you connect your screw to the motor?
>
> John Dammeyer
>
>
> Wireless CAN with the CANRF module now available.
> http://www.autoartisans.com/products
> Automation Artisans Inc.
> Ph. 1 250 544 4950
>
> >
> > Pictures at Flickr
> > I think this is right
> > http://www.flickr.com/photos/26361144@N00/
> >
> > these are prototype and apartial assembly.
> >
> > Thank -John
>

I'm glad you mentioned that.

The motors have a washer in them that when direction changes
will spring the shaft in or out just slightly.

the leadscrew needs to be put between the support columns in such a way
that it can't move from side to side at all. Not directly attached
to the motor shaft. I used skate bearings to "lock" the screw between
the columns...then carefully connect motor directly to the end of the
leadscrew with a straight coupler.

My circles were coming out not round and I watched what was happening
for hours before I saw that.

That's why my prototype machine in my pictures are "rigged up"

If you need more info let me know and I'll get you some pictures.

_John