Re: [CAD_CAM_EDM_DRO] Set-up tooling left in spindle-collet

The Perske survived the issue even though it was probably a full 60 seconds for me
to get to the main disconnect on the wall (yes I lost machine 0,0 :-) ). The main
switch was directly in the danger zone but I felt better getting to that than
anything right at the control. the E-Stop switch is on the Gantry and I was NOT
going to get that close.

Vibration was incredible and I do recall something hit the part being made so it
was scrapped.

Your "collet wrench back in the holder switch" would be a pretty good idea, though
a collet wrench in this case would have flown off before any real RPM was
developed. This was an extemely off balance item clamped in the spindle in the
chuck. I couldn't think of the proper name before but the holder was an "Indicol",
that and one SHOT "Interapid" too.

My office was on the other side of the window. I thought it would have been nice
to mount a remote "KILL" switch (E-Stop) where I sat in the office while most jobs
were running. That way, if it ever happened again, I would not have to make
believe I am a Super Hero and save the day. I don't work there no more, yippee.


Dismissal ? Well, I find that when you have a guy who actually keeps himself busy,
BY HIMSELF, you have to keep him even with an occasional mistake. We have enough
that need "Hand Holding" all day long. The Boss says "we gotta use 'em the way
they are, not the way they ought to be" !


The "E-Stop" outside of the machine environment isn't a bad Idea...........Nor is
your keyholder switch !

Chris L

JanRwl@... wrote:

> In a message dated 05-Feb-02 13:27:07 Central Standard Time,
> datac@... writes:
>
> > One of the fellows where I worked accidently flipped the switch on for a 3hp
> > Perske. What he forgot was, that he left a Dial Indicater and Flex Arm in
> > the
> > chuck. As one could expect, the last rpm setting was sky high. The Dial
> > came
> > off rather quickly, the arm was hanging for dear life. Vibration was felt
> > thruout the shop.
>
> Chris: I'd be very interested to know, if you can tell us: Was the Perske
> router motor (bearings) ruined by this mishap, or was your switching it off
> done in time to "save" it?
>
> One way to preclude such, and a way I have been often too lazy to implement
> myself, is make the "last switch" for such a spindle-motor dependent on a
> "key", specifically the "handle-end" of a collet-wrench, etc., so that MUST
> be pushed back into the "key-hole" to make it POSSIBLE to switch-on the
> spindle. And make it "grounds for immediate unconditional dismissal" for any
> workman to attempt to "defeat" such a thing with a dummy-plug, etc.
>
> Jan Rowland
>
> [Non-text portions of this message have been removed]
>
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