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Stop trusting your tool offsets after a crash, I learned the hard way last shift
I used to just re-zero my tool after any crash and keep running, figured a quick touch off was enough. Then last Tuesday on a 3 inch aluminum part for a local shop in Akron, I had a .500 end mill snap and I reset the offset but didn't check the holder. The next part came out .015 oversize and I scrapped a $40 blank before I realized the collet had shifted in the crash. Now I pull the tool completely, inspect the taper and the holder, and do a full indicator check on the spindle before anything else. It adds maybe 15 minutes but it beats redoing a whole setup or fighting a chatter issue that shows up two hours later. Has anyone else gotten burned by a hidden crash issue like a pulled tool or a tweaked holder that didn't look wrong at first glance?
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rosek7316d ago
The collet shift is sneaky because runout can still look fine at low rpm and only show up when you spin it up. Check the holder taper with blueing too, not just a dial test, since a small ding there will pull the tool off center once it heats up.
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brian30316d ago
Did you catch the collet shift right away or did it take a few parts before things started looking off? I had a similar deal where the holder looked fine but the taper had a tiny ding that only showed up once things got hot, and it cost me way more than 15 minutes of checking would have. Good on you for slowing down and doing the full once over, that habit pays for itself.
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