JonesL
Plastic
- Joined
- Jun 7, 2014
- Location
- California, USA
I'm usually pretty particular about surface finishes since the shaft is going into a bearing or bushing.
Now I've got to produce a rough texture for a dummy gun barrel.
U.S. G.I. gun barrels, especially around WW2, were pretty rough, almost had a super fine-thread look to them. Some of the bigger tubes were actually threaded because you screwed the trunnion up or down to get your elevation... don't think I need to go that coarse.
I figure increasing my carriage feed and taking light cuts, maybe even as if I was single-pointing threads so one pass doesn't mess up the previous one.
Anybody got an old Garand in their closet to give me an idea of a starting point; 30 t.p.i., 60 t.p.i., 48 t.p.i.,
Intentionally producing a rough finish?!? Probably has the old journeyman machinist I apprenticed with spinning in his grave so fast, he sounds like a dynamo.
Now I've got to produce a rough texture for a dummy gun barrel.
U.S. G.I. gun barrels, especially around WW2, were pretty rough, almost had a super fine-thread look to them. Some of the bigger tubes were actually threaded because you screwed the trunnion up or down to get your elevation... don't think I need to go that coarse.
I figure increasing my carriage feed and taking light cuts, maybe even as if I was single-pointing threads so one pass doesn't mess up the previous one.
Anybody got an old Garand in their closet to give me an idea of a starting point; 30 t.p.i., 60 t.p.i., 48 t.p.i.,
Intentionally producing a rough finish?!? Probably has the old journeyman machinist I apprenticed with spinning in his grave so fast, he sounds like a dynamo.