Re: To Belt or Not to Belt

--- In CAD_CAM_EDM_DRO@y..., JanRwl@A... wrote:

> In a message dated 22-Feb-01 23:55:21 Central Standard Time,
> carlcnc@s... writes:
>
>
> > Any input is appreciated.
> >
>
> (snip)Carl: I suppose if your absolute-positional accuracy is not

as critical on

> the alum. and plastics as much metal-machining demands, i.e., "same

as good

> cabinetmaker work" is close enough, then the belt would be OK.

Okay, that does IT! I scored 4 used really nice 7' ballscrew(1"
Warner) assemblies with big, heavy steel tracks and a carriage
assembly. The whole thing is spun with a EG&G servo motor with 500
line encoders and tach feedback. Complete with limit switches the
assemblies weigh 80 -90 lbs each. I was going to use them to build
my combo plasma cutter/wood router-interchangable head design. The
screws are 5 TPI. The units really hum along at 48 volts DC. Prior
to aquisition of the units I was sold on rack and pinion. Now after
reading some more posts I have decided that ballscrews on this type
of design are going to cause me problems. I guess I will use the
servos and go back to rack and pinion for rapid traverse and dirty
atmospheres. I can still use the ballscrews cut down for my
mill/drill conversion. Now I have to go back to the drawing board!
All that daydream engineering wasted :-)