Re: Stepper mount for Vertex H/V 6" rotory table ?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Tony Jeffree <tony@j...>
wrote:

> At 02:54 03/05/2003 +0000, you wrote:
>
> > > For the 6", I would not go below 200 oz-in or thereabouts. The
> >Vertex
> > > tables, despite having ball races on the worm shaft & on the

table

> >spindle,
> > > seem to need a fair amount of power to drive them. May be

something

> >to do
> > > with the grease they lube them with.
> > >
> > > Regards,
> > > Tony
> > >
> > >
> >
> >Tony,
> > I have a 6" Vertex and can not get a 200 oz in motor to turn
> >it. The stepper is a Pacific Scientific Powermax II. I have taken
> >all the backlash adjustment to where it is very free running, but
> >still no luck.
>
> Suggest you try cleaning out all of the bearing surfaces & re-

lubricating

> with a light machine oil - see if that makes a difference.
>
>
> Regards,
> Tony

When I set up my 4" Vertex table (from Tony !), I found that the worm
shaft was not free to turn in the eccentric bush that engages /
disengages the worm. I had to ream the bush to get a good fit before
it was suitable to 'show a stepper' - maybe Vertex has a
manufacturing problem in this area. Both parts looked well made, but
I suspect that either the shaft was very slightly warped or the bush
was oval. Either way a VERY small shaving with a reamer sorted it in
10 minutes.

Andrew Mawson
Bromley, Kent, UK