Bob I have been following this with Keen interest. I especially like the looks of the loop lever short range model. I had a thought ,it does happen occasionally anyway, what about using a straight taper instead of the radius. If the breech block doesn’t need it, it would be much easier to broach in. Actually, you could mill it in with the Long end mill.

This is great, Bob. You are doing the work and the rest of us suggesting how you should do it.
On Rodney's thought: The Farrow action has a similar cut which I could not do. Was able to make straight cuts work.
Keep it original if you can and appreciate this discussion.
Chuck

Couple picture that I have shown before but it’s easier for folks to reference them here for what I’m talking about.

I had said before that it appeared the breech block dropped into a valley in the trigger guard and then was forced to tip back, see the picture here.   

But I wasn’t sure how it lined up with the breech block because this can’t be seen when assembled.   

I now have enough measurement that I can say it does.   

My measurement from the center of the front hole in the guard to the bottom of the valley is .794.  I don’t show it in the attached drawing but from the front of the frame to the center of the first hole is .404.  The total of the 2 is 1.198.  From the front of the frame to the center of the breech block rail mortise is 1.210.  Only .012 off and some of that is probably my measurement of the trigger guard being slightly off.
Bob

rodneys wrote on Nov 2^nd, 2024 at 6:07pm:


Rodney, didn’t take it that you were.  One of the reasons I post builds like this here, is to get others input.  I’m not all that experienced and it’s nice getting others thoughts.

I was wondering about hand chiseling this in!  I have experience engraving so I understand the cutting tool profile but have never tried heavy material removal with a chisel.  I was going to use Greg’s method to rough it out in the mill on a test piece, then try taking it to the final radius using the chisel and see how smooth I can get it.  Of course the concave shape is going to make it more difficult!
Bob

rodneys wrote on Nov 2^nd, 2024 at 10:20pm:


That would be great Rodney.   

I’m not headed to Tulsa, just got back from a long trip 2 weeks ago.  I need to get to Tulsa at some point and will definitely stop when I do.

I also need to give you a call at some point in the next couple weeks.
Bob

Here are the chisels I made. And some practice cut. I need the practice too, took too heavy of a cut on the first pass. I use high speed, steel lathe tool bits, cobalt if you can get it. It is basically heavy duty engraving. Always practice before cutting your actual project, I guarantee it will save you time in the long run.

Rodney, I think this may be the answer for a one-off gun like this.  I got to thinking today that I have die sinker chisel in my engraving things, I think they ate 1/4 inch.  I need to dig them out.

I think it will take a special chisel though.  I’m fairly certain I can’t cut  the full radius with a straight tool, the tool will get to the point where you can lower it enough to continue cutting and control the depth.

Looks like if you want to remove metal these chisels will do it!
Bob