Hi Folks
Thanks for replies ..
Back online .. modem went tits-up ..
Reason I was asking this, in a rambling fashion, was I get a good finish on PVC sheet edges with this cutter, which is NOT a Rotazip, as I thought, but probably a woodwork cutter.
No camera at the moment, mate's daughter pinched mine,
again, 'cos the battery on hers won't charge. C-O C here with.
Sort of black phosphate thing ..

It appears it may be made some 20 - 30 yrs ago, possibly by Morrisflex?, for woodcarving in an air tool. The geezer who gave this info. could not see the thing, but it seems plausible. Not common or popular, but my description fits. Apparently very good on some woods where grain is 'interlocked'. Don't know what that is, kept quiet, ... anyway ..
In trying to get a decent finish on the edge of 10mm PVC sheet, with sheet horizontal, if I use a 2-edge slot drill, cuts fast, don't pick up, lots of chatter marks. 3-edge, better finish but either slow feed or it picks up. 4-edge good finish but picks up like nobody's business.
So, tried this cutter, did not look very convincing, but with about .010" .015" cut, fast and nice finish. No chatter marks.
Even better if I could do fast passes both ways. Works on ally, found out only 'cos it was in the chuck when I did it.
I surmise the cut on PVC is good, 'cos the 'trailing?' edges are ironing it for me ??

Dunno!. Accept that milling machines are more or less unidirectional ??
Too damn cold to bother about it now

Dave BC