There are many methods to centre workpieces for turning. They all
seemed laborious to me. The method I have devised may be a case of
reinventing the wheel but for me it was a discovery so I thought I'd
post it in case it helps fellow woodturning enthusiasts. I use a self-
centering four jaw chuck (my preference is a scroll chuck for speed of
adjustment but a keyed chuck does the job). The centre hole of the
chuck is fitted with a metal bung, either threaded or with a small
shoulder to stop it dropping through. (Threaded is better as it stays
in place when the workpiece is pulled away). The bung has a sharp
nipple turned on it in the centre. To use, place the chuck on its back
on a firm surface. Set the jaws to the right dimension and hammer the
two ends of the stock down onto it. This of cause not only marks it
but dents it for easy mounting. Very accurate, very fast.
Hope it helps
Exbrat