glbreil
Cast Iron
- Joined
- Feb 10, 2008
- Location
- McLeansboro, IL
I know questions like this are very common but while searching for answers I couldn't find anything with same goal in mind.
I want to remove some metal with a twist drill before boring but I want to do it gently without inducing anymore stress or pressure on the fixturing setup than absolutely necessary.
This is part of the process of chambering a rifle barrel in a Hardinge CHNC II lathe.
The material (416 Stainless 28RC) will be set up and dialed in running as true to the center of the barrel bore as I can possibly get it and the goal is for it to remain that way through out the entire process without disturbing it.
The barrel has a .250 pilot hole and I will be opening that up with a 7/16" cobalt twist drill going 2" deep. I will have about 80 psi oil coolant meeting the drill to help evacuate the chips.
After drilling it will be bored to the same taper as the cartridge.
So I am looking for recommendations on speed and feeds as well as peck increments.
Again the goal is to keep the stress low. It's not production and time isn't a real factor.
Any thoughts on this would be appreciated.
Thanks Gary
I want to remove some metal with a twist drill before boring but I want to do it gently without inducing anymore stress or pressure on the fixturing setup than absolutely necessary.
This is part of the process of chambering a rifle barrel in a Hardinge CHNC II lathe.
The material (416 Stainless 28RC) will be set up and dialed in running as true to the center of the barrel bore as I can possibly get it and the goal is for it to remain that way through out the entire process without disturbing it.
The barrel has a .250 pilot hole and I will be opening that up with a 7/16" cobalt twist drill going 2" deep. I will have about 80 psi oil coolant meeting the drill to help evacuate the chips.
After drilling it will be bored to the same taper as the cartridge.
So I am looking for recommendations on speed and feeds as well as peck increments.
Again the goal is to keep the stress low. It's not production and time isn't a real factor.
Any thoughts on this would be appreciated.
Thanks Gary