I working on getting all the MIM out of my Springfield mil spec and I'm taking on just about as much as I can. I know home gunsmithing is probably not the best of ideas, but we all have to learn somewhere and I think I can do it. Anyway, I was reading the 1911 Clinic thread and took a look at the hammer squarness part of it all. I have a Brown Hardcore hammer, and to check the squareness I got a new square lathe bit (GREAT idea Fuff, I wouldn't have thought of it). The hammer hooks didn't seem square, when I checked them under magnification and up to a light. Weird for a good hammer, "ah well" I said. After a bit I got to thinking. Most machineing processes will leave ever so slight a radius in the corner of things. So I got a piece of carbide that we had laying around that had square corners but a ever so slight radius on the edge. And lo and behold the hooks are perfectly square. As it turns out there is just a slight radius in the very bottom corner. I would imagine less then the .003" that spec drawings calls for (or is it .005? can't remember off the top of my head). Since there is going to be a secondary relief angle on the sear, the sear will likely never touch said radius to cause problems right? So here is the question, is it okay to leave that radius? And if it isn't how could i get rid of it? I have a milling machine in my dad's shop which I know how to use, but i never had experience with something to small and it doesn't have a DRO. If it is okay as is I'm gonna polish it up nice and good. Using tuners square (lathe bit) and polishing compound (another fine idea!). Anyway I'm gonna try and get pics and post them and a report after the rebuild, but if i'm gonna do it i better get on it.
quote:
Since there is going to be a secondary relief angle on the sear, the sear
will likely never touch said radius to cause problems right?
Right-o!
Yes! Leave the radius! A sharp corner leads to a crack. We wouldn't want the hammer hooks to break off.