Re: [CAD_CAM_EDM_DRO] Crashing CNCs: what gives ?

I keep hearing the same thing: some sort of settable limit should be
employed to keep the tooling from doing something stupid. The potential
for disaster bothers me most on our lathe. The more I think about it,
the more I'd like some sort of movable mechanical limit switch system.
The range of tools we use on the lathe is pretty big, so this might not
do much anyway.

Kim

On Tue, 2003-10-28 at 17:13, Raymond Heckert wrote:
> Most of the 'big dollar' programs employ 'no-go' zones. Places where the
> machine dare not go - under any circumstances (like chucks, etc.) These
> collision-avoidance zones are programmed at initial installation. That
> doesn't stop Stupid Operator Mistakes, though. I remember once, I 'backed
> up' part way through a program to re-do a feature that didn't clean up
> properly. Only after I hot the start button, and watched as the WRONG tool
> (1", multi-flute x 6" long endmill) promptly tried to go through a 2" thick
> section of aluminum. The endmill lost the battle, but the $800+ part was
> scrapped, I was reduced to a state of some humility... But I never did that
> again! When I went through Lincoln Electric's Robotic Welding Program, they
> employed a break-away head to prevent ultimate ruination.
>
> RayHex
>
> ----------
> > From: Kim Lux <lux@...>
> >
> > I'd like to know what is supposed to "give" when one crashes a CNC
> > tool/slide into a chuck, tailstock, etc ?
> >
> > Lets say we've got a servo/ballscrew set up that generates 1000 to 1500
> > pounds of force when called on. Next, we accidentally command that axis
> > to run into something immovable: a chuck, tailstock, etc. On a
> > commercial machine, how is this handled without wrecking anything ?
> >
> > Right now we've got a quick blow fuse that pops in our equipment. It is
> > the only way that I can see to limit the damage. What is everyone else
> > doing ?
> >
> > BTW: now that we are experienced, we rarely crash our equipment. I'm
> > just curious/wondering how others and commercial equipment handle this.
> >
> > --
> > Kim Lux <lux@...>
> >
>
>
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--
Kim Lux <lux@...>