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3/6/2013 4:25:03 AM EDT
Assuming there are no belts to slip in the drive system, what happens when the cutting tool stalls (eg, drill bit breakthrough)?

Is there a clutch or does the motor stall and overload trip?
3/6/2013 4:32:29 AM EDT
[#1]
It usually slips in the holder (chuck) and tears up the shank or in the case an end mill it will usually break the flutes corners off.

Or it rips the piece out of the holder and flings it across the room.
3/7/2013 1:20:34 PM EDT
[#2]
Thanks for the input.
3/7/2013 2:44:59 PM EDT
[#3]
I've had my mill stall, and even being belt driven the cutter stopping, stoped the motor. Its a manual mill so I just hit the power switch really fast and backed everything up to get free and started again. The motor is controlled by a vfd and it likely would have shut down the output had I not intervened first. Its also only a 1 HP mill, the larger the motor the more power is available to tear stuff up!!
3/7/2013 3:11:13 PM EDT
[#4]
With a drill bit, the bit will probably break first. If it doesn't then it'll probably slip in your drill chuck or collet. Probably not going to break the machine if that's what you are getting at unless it's a cheapo small machine. We have kids at school that have left wrenches on the draw bar when they turned the machine on and it just snaps the draw bar.
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