Re: Plasma cnc

I am not sure of the tolerances you plan to hold, but you might want
to read more about that.

from what I have read, the cutting tip can meander and the highly
accurate stuff is not needed.

what I found as the simplest approach is a heavy table with water
bath under and a decent fan for exhaust.

inverted angle iron and Vee notched wheels. then mount a gear rack
on one of the angles so the dust will fall off. smaller motors are
all that is needed for non-contact tables.

eleminats linear shafting, and ball screws. if you felt the need for
linear shafting you could get by with one rail on one side.

That should save you enough to buy the Hypertherm.

Dave





--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Tyson S."
<timbercutter@y...> wrote:

> Yeah, the Hypertherm Powermax 1250 is top of the line
> for CNC plasma operations. It allready has the remote
> torch on/off terminal installed for the G-Code to run
> the torch. But at $3500 I say ouch. I am also drawing
> up plans for a combo plasma/router cnc machine and am
> looking at drive options. The ball screws for an
> 5'X10' table run in the thousands of dollars. I was
> wondering if anyone here has ever seen,used,heard of
> chain and sprockets instead of screws? My parents have
> a picture framing shop and they use a CNC mat cutter.
> I was looking at the gantry rails to see what kind of
> drive system was there and it's all small chain and
> sprockets. a littls smaller than a bicycle chain would
> be. seems like if the chain was tight enough there
> would be no backlash. Since I want to use dual drive
> on the long axis, I am going to need 20 feet of ball
> screws, this is way out of budget at this point.
> --- "Jens Swales <jipeess2000@y...>"
> <jipeess2000@y...> wrote:
> > hi
> >
> > i was recomended a plasma-rig from hypertherm, they
> > dont produce
> > those nasty ignition-sparks that knocks out the
> > system
> >
> >
> > js
> >
> >
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