Hi All,
I have a Criterion DBL-202 Boring Head with an R8 Shank. I've been trying to remove it so I can switch it to a 3/4" straight shank to do some ball end turning.
I tried mounting it in my mill with a 1/2 steel bar in the cross holes of the boring head - The design of my mill prevents me from "locking the spindle", so I'm left using the spindle spanner and I can't even come close to to getting enough torque to break the head loose from the shank.
Next I grabbed the shank in the 3 jaw chuck of my lathe. Engaged the back gear to lock the spindle. Applied a fair amount of torque, such that I started unscrewing the Chuck from the spindle.
Next I clamped it in my vice with soft jaws - No luck, started to bend the 1/2 rod and spin in the jaws.
Next while still in the vice, I heated the head with a heat gun, til it started to smoke, applied torque - Still no luck. I even tried shocking it a bit by hitting the bar with a hammer while applying torque to head.
Criterion specs show it's RH tread, so I double checked I've been applying torque in the counter clockwise direction.
Anyone have any other suggestions? I'd prefer to not destroy the R8 shank, since I still plan to use it.
Thank in advance,
Chris
I have a Criterion DBL-202 Boring Head with an R8 Shank. I've been trying to remove it so I can switch it to a 3/4" straight shank to do some ball end turning.
I tried mounting it in my mill with a 1/2 steel bar in the cross holes of the boring head - The design of my mill prevents me from "locking the spindle", so I'm left using the spindle spanner and I can't even come close to to getting enough torque to break the head loose from the shank.
Next I grabbed the shank in the 3 jaw chuck of my lathe. Engaged the back gear to lock the spindle. Applied a fair amount of torque, such that I started unscrewing the Chuck from the spindle.
Next I clamped it in my vice with soft jaws - No luck, started to bend the 1/2 rod and spin in the jaws.
Next while still in the vice, I heated the head with a heat gun, til it started to smoke, applied torque - Still no luck. I even tried shocking it a bit by hitting the bar with a hammer while applying torque to head.
Criterion specs show it's RH tread, so I double checked I've been applying torque in the counter clockwise direction.
Anyone have any other suggestions? I'd prefer to not destroy the R8 shank, since I still plan to use it.
Thank in advance,
Chris