Maximum chuck RPM - how much danger?
How seriously should maximum chuck RPM figures be taken? For example, if I spin my Vicmarc VM120 (max quoted speed 2500rpm) at the top speed of my lathe (3200 rpm), is it likely to explode and kill me, or is Vicmarc being very conservative with its specifications? Does anyone know of a chuck failing due to high rpm? What are the actual risks of running a chuck faster than it says on the label?
I don't see why a 5" woodturning chuck would have as low a limit as 2500rpm. If you look at specs for 5" engineering chucks, they're generally good to 5000rpm and beyond. Manufacturers obviously intend even their bigger chucks to be used for very small workpieces because they supply the appropriate jaws - so why would they make the chuck unable to withstand the high speeds necessary for turning 1" stock and smaller?