In article ,
Ignoramus11290 wrote:

No, nothing happened, I just want to know a little more.

What happens if I make a wrong instruction and, say, crash a spindle
into a vise. What would happen in reality? It is somewhere in the
range between "nothing special" and "explode in a giant fireball". So,
in reality, what happens if I crash a running spindle into a vise or
something of that sort. Would the mill be ruined permanently?

i

It depends. You will (almost) always kill the bit. You'll scar the vise
with the remains of the bit. At that point, either something breaks or
the drive system notices that things are not moving and hopefully goes
to a graceful error mode (ie, stop trying, shut down spindle if spindle
shut down is under program control), rather than making things worse.
Otherwise it becomes an "irresistible force .vs. immovable object" game
until one of them gives up.

In general, watch like a hawk (with a manual kill switch for the machine
- if you don't have one, make one or more) on any new program or
modification. With the router, I also like to "air cut" the whole
program with the machine zero raised an inch or more off the table,
looking for moves that don't belong. I don't always do this, but I've
had some nasty reminders when I don't (ie, trying a particular routine
thats supposed to do a circle cut which turns out to ignore z-axis
scaling - I was working about 25%, so the bit dropped 4 times deeper
than called for and took off smoking, while I grabbed for the kill
switch.)

This is one area where having super-fast, super-powerful axis drives can
become super-expensive when they crash in a superlative fashion and
damage things thought to be sturdy. If your drive logic/control allows
for it, setting some limits that are considerably lower than the drive
is capable of may help with damage control. You can also put mechanical
fuses (shear pins or slip clutches) into the drive train for a
non-computer-dependent limit on possible damages.

--
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