Re: [CAD_CAM_EDM_DRO] X-Y Table, Rotary Table for CNC INFO

Hi Marcus
Hmmm I guess 4 short ballscrews with timing belt or something.
Kind of like my wood planer.

It would have to be rigid, but it might be so small that it would not
be too heavy.

Just daydreaming really... people often ask if I can design a
small cnc with good accuracy for an arbitrarily low price...
but the price usually turns out high. Manufacturing even small
machine tools in the US is a pretty rough proposition.... consider
Bridgeport, South Bend, et al. But one can do it for a hobby
with no problems! As a business I only build machine tools
for internal use and that has worked out ok. Of course I do
design some production machine tool components, but
the development cost is pretty high for my customers.

Les

Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.alltel.net/~leswatts/wattsfurniturewp.html
engineering page:
http://www.alltel.net/~leswatts/shop.html
Surplus cnc for sale:
http://www.alltel.net/~leswatts/forsale.html

----- Original Message -----
From: "Marcus & Eva" <implmex@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, January 15, 2003 11:10 PM
Subject: Re: [CAD_CAM_EDM_DRO] X-Y Table, Rotary Table for CNC INFO


> Hi Les:
> Were you thinking of a four poster bed type of setup with a central
> screw?
> Or maybe four timed screws with encoders or steppers slaved together?
> I suppose you could chain drive them or belt drive them from one stepper
> too.
> That could work pretty well I think, if you used good hunky frictionless
die
> bushings and pins.
> I'm thinking of the kind that have sleeves with balls in them; the ones
> that are used for big punch dies.
> You could make the base wide enough that the pins hang over the edges of
the
> mill table as they come through the base plate.
> That way you wouldn't lose too much height under the spindle nose.
> Gonna be a pretty heavy accessory unless you make the base out of
aluminum.
> Cheers
>
> Marcus
>