LochinvarDan
Plastic
- Joined
- Dec 4, 2007
- Location
- Lebanon, TN
Today I witness what I thought was an oddity.
My machinist was plunging a .500" 4 flute tool steel endmill into a block of 1.5" thick cold rolled when the spindle "stalled" out. The hole was predrilled with a .375" drill to 1.000" the endmill was set to plung the same distance so the last couple pecks would have to hog out more material. On the second to last and the last peck of 0.050" the entire spindle stalled. We where both shocked that the spindle would stall before the tool would break or the tool would spin in the collet. I believe the spindle speed was right around 350rpms and the feedrate at 1.67 with coolant on(what ever the factory defaults are for).
We did two identical blocks the second one is the only one that stalled but both had holes meausreing .540"
We had tricked the machine by going to the tool setup page and idicating the end mill was a drill in order to get the machine to do the single hole peck drill. We are both new to cnc milling.
The holes being oversized I think is cleary chips building up and ruining the wall of the bore.
It never through any alarms like I thought it would.
What do you all think?
My machinist was plunging a .500" 4 flute tool steel endmill into a block of 1.5" thick cold rolled when the spindle "stalled" out. The hole was predrilled with a .375" drill to 1.000" the endmill was set to plung the same distance so the last couple pecks would have to hog out more material. On the second to last and the last peck of 0.050" the entire spindle stalled. We where both shocked that the spindle would stall before the tool would break or the tool would spin in the collet. I believe the spindle speed was right around 350rpms and the feedrate at 1.67 with coolant on(what ever the factory defaults are for).
We did two identical blocks the second one is the only one that stalled but both had holes meausreing .540"
We had tricked the machine by going to the tool setup page and idicating the end mill was a drill in order to get the machine to do the single hole peck drill. We are both new to cnc milling.
The holes being oversized I think is cleary chips building up and ruining the wall of the bore.
It never through any alarms like I thought it would.
What do you all think?