300RUM Report post Posted September 10, 2017 I have seen one used. It is a hollow cutter, that when lowered over the bolt knob, turns it into a 5/16 shaft in one pass. Tools are expensive. Sometimes when you are a shade tree guy you just make do with what you have. Mill the knob down to square. Place the boring bar in the boring head backwards and run the mill in reverse. The boring head can now cut inwards and form a shaft. Thread the shaft & install the bolt knob. Hey, I got there. I just took the scenic route. Share this post Link to post Share on other sites
Zeke-BE Report post Posted September 10, 2017 It took me a second to catch on but that was pretty cool Share this post Link to post Share on other sites
MULEPACKHUNTER Report post Posted September 10, 2017 It's called a lathe, lol A fixture on a lathe would do that quick and threads too. Nothing wrong with it though, specially if you do 1 a year. Share this post Link to post Share on other sites
jeffro Report post Posted September 10, 2017 I did one with a grinder and a file. It cam out fine it just took forever to get it to dia. to thread. Share this post Link to post Share on other sites
mfernaz Report post Posted September 10, 2017 Nice. Share this post Link to post Share on other sites
300RUM Report post Posted September 10, 2017 It's called a lathe, lol A fixture on a lathe would do that quick and threads too. Nothing wrong with it though, specially if you do 1 a year. I have the lathe. Someone does make a fixture that attaches to a face plate and aligns the bolt for turning. Can you imagine trying to get a bolt set up on a face plate without a special fixture to hold it? I believe I would join jeffro with the grinder and file approach first. Share this post Link to post Share on other sites
Lucafu1 Report post Posted September 10, 2017 I used a cut off wheel, then hit it with a die grinder using a washer as a guide. The run a die over it. Done. Share this post Link to post Share on other sites
MULEPACKHUNTER Report post Posted September 10, 2017 Here's you go, just what you need. Share this post Link to post Share on other sites
300RUM Report post Posted September 10, 2017 That's kind of the same idea. The one I saw had 3 or 4 prongs and a flared opening to cut away the knob before it cut the 5/16 shaft. It was designed specifically for that job. Hate to think what it cost. Share this post Link to post Share on other sites
MULEPACKHUNTER Report post Posted September 10, 2017 You could make that body easy on your machines then just have a tool shop braze on the carbide. Could be under a hundred bucks Share this post Link to post Share on other sites
300RUM Report post Posted September 10, 2017 The one I saw was not brazed carbide. I am just a hobby gunsmith. I have done two of those bolt knobs in 5 years. I think the boring head still has a job. Maybe I will do another one in another 5 years. Thanks for the input though. I'm curious about the mic to the upper left of the cutter in your picture. Does it clamp onto the work to measure hole depth? Share this post Link to post Share on other sites
MULEPACKHUNTER Report post Posted September 10, 2017 That's an anvil mic, can do many jobs but mostly it's for measuring a hole to a surface. It can be a mic by adding a flat ground plate, a pin mic by adding a pin, a depth mic as well. Very good tool. Share this post Link to post Share on other sites
MULEPACKHUNTER Report post Posted September 10, 2017 Here's on as pin mic and one as regular mic. Pull the top plate off and it's a depth mic Share this post Link to post Share on other sites
300RUM Report post Posted September 10, 2017 That's funny, now I recognize it. Remove 1 little piece and I get all confused. Not a very good qualification for playing gunsmith is it? Share this post Link to post Share on other sites
muledeerarea33? Report post Posted September 11, 2017 I'm curious about the tool in the upper right hand corner? Odd tool in the bunch. Does it cut steel with one swift cut? Share this post Link to post Share on other sites
