johan teughels
Member
just a brainfart ...is the 120 dgr taper cut setting ( for the bolt) the same setting as the 30 dgr setting for the 60 dgr thread cutting ?
barrel cutting angles
- Thread starter johan teughels
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Randy Perkowski
New member
Cutting Angles
Most lathes used for chambering are a 2-axis design. The angle required must be taken off the correct axis. An angle can be described as the degrees from a given axis. A thirty degree angle from the cross slide axis can also be describe from the machine bed axis. I try to keep all angles defined as an angle less than 90 degrees. This requires use of the correct axis. The direction of the cut will also help define the angle. The cross slide axis is 90 degrees from the machine bed axis. A 30 degree angle from the cross slide axis could either be 60 or 120 degrees from the machine bed axis. That is determined by the requirements of the cut.
Randy
Most lathes used for chambering are a 2-axis design. The angle required must be taken off the correct axis. An angle can be described as the degrees from a given axis. A thirty degree angle from the cross slide axis can also be describe from the machine bed axis. I try to keep all angles defined as an angle less than 90 degrees. This requires use of the correct axis. The direction of the cut will also help define the angle. The cross slide axis is 90 degrees from the machine bed axis. A 30 degree angle from the cross slide axis could either be 60 or 120 degrees from the machine bed axis. That is determined by the requirements of the cut.
Randy
jackie schmidt
New member
just a brainfart ...is the 120 dgr taper cut setting ( for the bolt) the same setting as the 30 dgr setting for the 60 dgr thread cutting ?
Simple answer, yes.
But, do not set your compound at 30 degrees. Set it at 29 degrees, so it will have a tad more clearance toward the OD of the cone, but still have the same support of the case web at the case head.
Last edited:
JerrySharrett
Senile Member
The old handbooks call for setting the compound at29.5 degrees, so use that and cut both the cone and the threads. The 29.5 setting for threading Infeed is to give a burnish finish on the thread loading side.
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