Flintlock muzzle loader came in today broke.

[aametalmaster]

A guy up the road from me brought in his flintlock ML and said the breech plug was stripped out. He had worked on it with a hacksaw and some fishing line. So i need to figure out the thread in the bore to restore it then make a new breech plug from scratch. And yes that is a chopped off brass powder measure pounded in the plug. Don't know why but its there. More pics to come...Bob

[doubleboost]

That would hurt if it blew out
John

[ScrapMetal]

Wow! I'm impressed the owner didn't hurt himself. Good thing he had enough sense to at least turn it over to you.

-Ron

[aametalmaster]

Going to have to re thread the ml barrel as it has triple start threads and is metric. Going to make it something standard i can work with...Bob

[stevec]

Triple start threads, I'm glad you're doing it . not me.
Keep us posted

[f350ca]

Haven't tried multiple start threads yet, the Summit has some sort of indexing plate built into the back of the spindle for up to 10 start threads. Been a while since I had the cover open but I think its a plate on the spindle and a pin system to lock the first gear in the drive. Simply index it over to move the start of the next thread.

[stevec]

Aw c'mon Greg, ya just engage the half nuts in between numbers (if you can) .
I guess it depends on the lead screw pitch and what its gearbox can provide.

[Mayhem]

I recently made a multi start thread

[stevec]

See how easy it is!

[aametalmaster]

On V Kay until the 2nd of September so i went to the shop to work on the ML. Made a new breech plug and threaded the barrel. My camera died so here are the barrel drilling pics and how i did it. There could be a zillion ways to do what i did but this was the easiest for me....Bob

Pic 1 1/2 pin in the bore to line the barrel up
Pic 2 jig holding the barrel to the t slot cross slide.
Pic 3 Using my steady rest to hold up the end of the barrel. Yes you can hold an octagon just don't turn the machine on. The barrel will slide L-R as i am drilling and tapping it just won't turn.
Pic 4 Drilling out the old 4 start metric threads with a 4 flute 5/8" drill.
Pic 5 Drilling 11/16
Pic 6 Tapping 3/4-16