You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
1941 johnson firing pin
- Thread starter ongaro
- Start date
I have one on my kitchen table right now, but you can't have it: it's outta my Johnson!
As a machining job, it doesn't look all THAT awfully difficult, just so long as you have a lathe with a milling attachment on the cross-slide. Gotta be somebody who can help out.
I CAN tell you that it is 5-point-six inches long precisely and that you can make it outta quarter-inch stock: major diameter is .245".
The thing was designed for mass production by a guy who really knew his stuff. Cranston Tool in Providence was where a lot of the work was done, but many parts were subcontracted to small shops. That was one of the design features of the Johnson: most of the gun could be made almost anywhere.
There are guys on here who are very talented with machine-tools; they know a LOT more than I do. If you can find someone who will make one, I will measure up the one here and put it onto paper. I'm no draughtsman but I do have a good micrometer and a 6-inch caliper and if I try real hard, people can read my hen-scratches. A Johnson is just too nice not to shoot.
BTW, does anybody know if a Springfield barrel can be put onto a Johnson barrel-extension? My barrel is utterly shot: slugs gain speed all the way while they're falling through it! I know that Johnson started off with a Springfield barrel when he was designing the thing, just don't know if he kept that thread.
As a machining job, it doesn't look all THAT awfully difficult, just so long as you have a lathe with a milling attachment on the cross-slide. Gotta be somebody who can help out.
I CAN tell you that it is 5-point-six inches long precisely and that you can make it outta quarter-inch stock: major diameter is .245".
The thing was designed for mass production by a guy who really knew his stuff. Cranston Tool in Providence was where a lot of the work was done, but many parts were subcontracted to small shops. That was one of the design features of the Johnson: most of the gun could be made almost anywhere.
There are guys on here who are very talented with machine-tools; they know a LOT more than I do. If you can find someone who will make one, I will measure up the one here and put it onto paper. I'm no draughtsman but I do have a good micrometer and a 6-inch caliper and if I try real hard, people can read my hen-scratches. A Johnson is just too nice not to shoot.
BTW, does anybody know if a Springfield barrel can be put onto a Johnson barrel-extension? My barrel is utterly shot: slugs gain speed all the way while they're falling through it! I know that Johnson started off with a Springfield barrel when he was designing the thing, just don't know if he kept that thread.
If only the tip is missing then, as soon as you start doing anything to it, you're down into the triangular section where there's lotsa meat.
I would thing you're right: centre it up, drill into the triangular section, set in a new pin, silver-solder it in place, contour to fit and then cut it off and round the tip, right at 5.6". Should work.
Working from mine, precise diameter of the actual firing-pin tip, the part that whacks the primer, is .0774", but I really don't think they were all THAT critical. (If they had been, nobody could have made them!) But that's what mine measures, according to Mister Moore & Wright. Likely there is wear to take into consideration.... mine was REALLY through the Pacific campaign: nowhere nearly good-enough looking to go on television!
Keep us posted, kindly. This is interesting!
Hope this helps.
I would thing you're right: centre it up, drill into the triangular section, set in a new pin, silver-solder it in place, contour to fit and then cut it off and round the tip, right at 5.6". Should work.
Working from mine, precise diameter of the actual firing-pin tip, the part that whacks the primer, is .0774", but I really don't think they were all THAT critical. (If they had been, nobody could have made them!) But that's what mine measures, according to Mister Moore & Wright. Likely there is wear to take into consideration.... mine was REALLY through the Pacific campaign: nowhere nearly good-enough looking to go on television!
Keep us posted, kindly. This is interesting!
Hope this helps.
