RE: [CAD_CAM_EDM_DRO] Crashing CNCs: what gives ?

I, as well as others have used limit switches mounted on magnets. Slide
the swich to the point you want it to trip and there you go.
Dan

-----Original Message-----
From: Kim Lux [mailto:lux@...]
Sent: Wednesday, October 29, 2003 6:06 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: 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@...>


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OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it
if you have trouble.
http://www.metalworking.com/news_servers.html

http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there,
for OT subjects, that are not allowed on the CCED list.

NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill
List Mom List Owner



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