Re: Home made CNC rotary table??

--- In CAD_CAM_EDM_DRO@y..., "jeffdavis516" <cadman@p...> wrote:

> I'm wondering if anyone here has any experience with making your
>own
> CNC rotary table. I'm not interested in the small one from
>sherline
> but maybe a 6" or 8" size. Has anyone taken a standard one and
> somehow removed the backlash and added a stepper or servo motor to
>it?
>
> Maybe there are places that sell ones ready that are not too
> expensive :)
>
> Thanks
> Jeff Davis

Jeff,
Take a look at http://www.divisionmaster.com
Have a look at the examples page and also have a look at the
following three files.
http://homepage.ntlworld.com/machines/5cga.jpg
http://homepage.ntlworld.com/machines/5ccomplete.jpg
http://homepage.ntlworld.com/machines/vertex_GA.jpg

The first file is a general arangement shot of a standard el cheapo
J&L 5C spin indexer being converted. The worm gearbox is a standard
popular Italian reduction gearbox that is very common in the UK and
also cheap.
Second shot is the finished indexer with a samll 3" 5C chuck fitted.

Last shot is an 8" vertex table converted to stepper drive and being
driven by the Division master unit on a manual Bridgeport.
This is a shot of cutting some pneumatic face seal valves.

The Divisionmaster is similar to the Sherline unit but because it's
more versatile it's only just reached the market.
You can program this for jog speed, cutting speed, number of
divisions of the reduction, backlash and motor amps to name a few
points that differ from the sherline unit.
It also puts out step and direction so you can drive bigger units
with it. I have mine running a Gecko 210 on 74 volt 7 amp to run a
big Hoffman dividing head powered by 1,100 ox in type 42 stepper.

John S.