OAKVILLE SHOOTER
Member
- Joined
- Sep 19, 2007
- Messages
- 352
I am trying to drill and tap the barrel of my son's Henry Mini-bolt .22 so that I can install the cantilever scope mount that I purchased from Henry Arms. The holes were drilled with a #31 drill bit. I attempted to tap the holes with a 6-48 tap. This is where the fun began. As per the instuctions, I drilled the holes to .155" (.156" MAX tap drill depth, .120" MIN thread depth.) What I found was that a Taper tap bottomed out with out even touching the sides of the hole. The Plug tap touched the sides, but bottomed out before being able to cut any threads. I tried starting with the Bottom tap but had a tough time keeping it straight. I did not run it in far enough to cut any threads, just to see if it would work and decided against it. Next, I filed the end of the plug tap off a little, so that it at least be able to start threading the hole. Turned roughly 1/4 turn, backed it out, started again. Yes, this is the point where THE TAP BROKE!!!:banghead: Yes, I was using thread cutting oil.
I realize that getting the tap out will be a major PITA, and that is if I can do it without ruining the barrel. So, now I have 2 questions:
1: What is the best way to remove the broken tap? Most of it is below the top of the hole, with a tiny piece sticking slightly above the top of the barrel.
2: If I am able to get the tap out, what is the best/proper way to tap a blind hole that is too shallow for a taper or plug tap to start?
Any help would be greatly appreciated and I thank you in advance
Oakville Shooter
I realize that getting the tap out will be a major PITA, and that is if I can do it without ruining the barrel. So, now I have 2 questions:
1: What is the best way to remove the broken tap? Most of it is below the top of the hole, with a tiny piece sticking slightly above the top of the barrel.
2: If I am able to get the tap out, what is the best/proper way to tap a blind hole that is too shallow for a taper or plug tap to start?
Any help would be greatly appreciated and I thank you in advance
Oakville Shooter