Originally Posted by
WilDun
Yes, 39B I always found was a delight to machine. - In my later days I worked part time in a gearcutting shop and most days I trudged through the traffic from Mt Wellington to Mt Albert with shafts and gears to have them hardened at Heat Treatments, then trudged back with hardened ones.
On the odd occasion we might get a slightly banana shaped shaft (after hardening) which tended to piss us off somewhat!
I once had one out of 6 shafts come back bent. They were machined more or less identical, except the bent one had a wee witness mark from where a chamfer hadn't quite cleaned up the end of the bar stock.
Ever since then I've avoided the last couple of inches and haven't had any significant issues.
Oh, except for a bit of Chinese shit, the remainder of which went in the bin at tolerably high speed.
Go soothingly on the grease mud, as there lurks the skid demon
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