Re: Crashing CNCs: what gives ?

Hello,
I work with HAAS VMC's at work and am still very disappointed in
the lack of protection built into these otherwise wonderful
machines. I don't think there will be a perfect solution for this
until the CAM software is built into the controls of the machine so
that the ENTIRE setup can be simulated making it easy to visulize how
close the spindle and tools will come to your fixtures/clamps. I
think this isn't asking much when the price of even the cheapest CNC
machines is around $20,000. I think maybe in 20-30yrs machines will
come with cameras that can spot when a crash will occur and alert the
operator, that would be a dream come true :).

David Bloomfield

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Kim Lux <lux@d...> wrote:
> 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@d...>