Just picked up a SB heavy 10, ? about setting up for threading
Hello, Me and my dad just picked up a South Bend Haeavy 10 lathe and I was wondering how most folks here set theirs up for barrel threading. I have heard many people say the best thing is to make a spider for the backside of the headstock and use a 4J chuck. Is the the easiest solution? thanks
That's one way of doing it. In the past I've held the breech end in a chuck and threaded out at the tailstock as well, but your bed needs to be pretty straight for that.
Ditto, Bore gauge in the barrel to mic the bore/ gauge out as far as you dare to confirm that the bore it true to the machine.
So spider on the on the back end, and thinner point jaws/clasping ring on the 4 independent chuck to get the barrel bore running true to the machine all the way (and not just the end of the bore muzzle alone).
You may be away without a spider for a short FS just mic'g the end of bore), but on a can, you talking baffle strike every time if the can is not running true with the bore.
Should work on all but the shortest bbls on the heavy10. Only very long bbls can be done that way on my SB13...so I use a 4jaw and live center with a mandrel down the bbl end to indicate concentricity. I also sometimes put a dead center in the 4jaw and then use a dog on the bbl as it is nice to be able to pop it in and out for test fitting as you creep up on the pitch diameter.