Posted by Mike Poole on 06/03/2018 18:45:09:
I always avoid standing in the firing line if at all possible, apart from the key all sorts of crap come out of a spinning chuck, bits of swarf and oil and even the job if you forget to tighten the chuck.
Mike
The main exceptions in my case would be:-
- when watching for a boring bar or internal threading tool emerging from the back end of a bore at low revs or on a very light finishing cut;
- when knurling or parting close to the chuck and the action needs close inspection
- when forming (typically radii) across a broad cutting face at low revs.
Plus, of course, with most lathes without a clutch and with headstock switchgear, it's necessary to reach across the line to switch on and off. So all-engaged threadcutting – forward and reversing out – should probably be added.
I think it's a matter of knowing what the risks are, and which ones to take and when.