Re: Home made CNC rotary table??

Thanks for showing me the photo section. It looks like this rotary
table has lost its ability to become horizontal. That does not
matter, I don't think that this design tried to limit the backlash
that is in these rotary tables.

I just had a thought. I dont know enough about the way a servo works
with its encoder. I know that if the encoder is not recieving it's
signal the motor will just run when I turn on the servo box power.
So somehow the encoder stops the servo motor from turning until a
step is delivered.

What if somehow the encoder was placed on the axis of the rotary
table? Would this cause a problem with the backlash in the table? I
don't know if the servo motor is bouncing back and forth when in a
holding position. If this is so then the motor would be bouncing
back and forth in a greater movement if the encoder was on the table.

Can you see where I'm going with this? I just don't know enough
about the way these servo motors and encoders work.

Jeff
http://www.homecnc.info

--- In CAD_CAM_EDM_DRO@y..., Larry Van Duyn <lvanduyn@z...> wrote:
> Hello jeffdavis516,
>
> Tuesday, May 7, 2002, 2:25:31 PM, you wrote:
>
> j> I'm wondering if anyone here has any experience with making your
own
> j> CNC rotary table. I'm not interested in the small one from
sherline
> j> but maybe a 6" or 8" size. Has anyone taken a standard one and
> j> somehow removed the backlash and added a stepper or servo motor
to it?
>
> Take a look in the photo section at the folder labeled "K8JBL".
This
> is a standard Phase II 10 inch table which they also make in an
8 inch
> size...
>
>
>
> j> Maybe there are places that sell ones ready that are not too
> j> expensive :)
>
> j> Thanks
> j> Jeff Davis
> j> http://www.homecnc.info