Had a drill chuck let go at 12,000 RPM on a production run last Tuesday

I was running a job on a Haas VF-2 in the corner bay at Precision Parts in Dayton and that cheap import collet nut I threw on three months back just spun the HSS endmill straight into the aluminum fixture, bending the part and shattering the insert before I even hit the feed hold, has anyone else had a tool holder failure like this on a fast spindle where the real damage came from the time it took you to react?

2 comments

2 Comments

nathan_webb1mo ago

Take this with a grain of salt but a faster reaction time still won't save you from a 12k rpm launch.

grace_fox31mo ago

Ngl I gotta push back here. A faster reaction time DOES save you from a 12k rpm launch if you know what you're doing. Put two drivers in the same car, one with a half second reaction and one with a 0.1 second reaction. The faster guy is gonna get the jump every time and be ahead before the other guy even moves. Reaction time gaps are huge in real racing, not just drag racing. Even if the car pulls hard at high rpm, that first instant off the line decides who gets the track position and who has to play catch up.