Mike in Oregon
Gold $$ Contributor
Defiantly carbide!When your doing 100s -1000s the turning mandrel can get warm and expand. At a minimum go with carbide mandrels for both expanding and turning.
I really like the PMA neck turner. I haven't done 1000 of one batch but several different cals in the 500 ish range. I just use a drill and case driver and hold the turner by hand. Do 50-100 while sitting the turner on an ice pack between each case and then get sick of it and do something else for a while.
A while ago I saw a guy machine a mandrel in the lathe, push the case neck onto the mandrel and support it with the live centre in the tailstock, then turn the neck with the lathe. This idea has the benifits that the mandrel is not turning inside the neck creating friction. How well it holds tolerance is up to the operator and lathe. Speedy did it the other way around using a small lathe to hold and spin the case while holding a pumpkin turner by hand. Cortina was doing it in a milling machine.