Mini-Mauser barrel threads?

willsnipe · January 16, 2006, 02:15 PM

Have any of you folks barreled a Charles Daly Mini-Mauser? I'm thinking about one, but the only information I've come across says the threads are 22mm-1.5 which might be a real challenge on my lathe. Said information is from a 1989 magazine article, so anything could have changed since. Any help would be greatly appreciated.

Clemson · January 16, 2006, 03:10 PM

22x1.5 is correct. Metric threads.

Clemson

Harry Bonar · January 17, 2006, 07:17 PM

Dear Shooter:
You should have gotten several gears with your lathe so you could cut the proper thread.
But, all is not lost - Ha! Consult the "feed chart" on your lathe for the amount of advance it would be that would give you 22 TPI, set it for that and you'll probably be O.K.

Now, I take it that it would be 22 TPI with a thread angle or pitch
of 1.5?? Correct, I hope!
Now 22TPI would be a tread (one turn) of .0455 ten-thosands, or rounded off to.046 tip to tip of threads (Hope I'm doing this right!)
So, if you find in your tables a gear setting for .045 it will turn out to be 22TPI. (I think the best I can help you.)
The way to test this is to chuck your removed bbl in your lathe and engage the thread lever with the tool almost touching the bbl. threads and check!
You can grind your tool for the 1.5 piych to fit your bbl threads and take a test piece of steel turned down to the major dia.' and run a test thread and see if it fits your action!

Hope this helps. If you're getting a Douglas bbl, I'm certainn they'll turn this for you. Harry B.

Harry Bonar · January 17, 2006, 07:20 PM

Dear Shooter:
You should have gotten several gears with your lathe so you could cut the proper thread.
But, all is not lost - Ha! Consult the "feed chart" on your lathe for the amount of advance it would be that would give you 22 TPI, set it for that and you'll probably be O.K.

Now, I take it that it would be 22 TPI with a thread angle or pitch
of 1.5?? Correct, I hope!
Now 22TPI would be a thread (one turn) of .0455 ten-thosands, or rounded off to.046 tip to tip of threads (Hope I'm doing this right!)
So, if you find in your tables a gear setting for .045 it will turn out to be 22TPI. (I think the best I can help you.)
The way to test this is to chuck your removed bbl in your lathe and engage the thread lever with the tool almost touching the bbl. threads and check!
You can grind your tool for the 1.5 pitch to fit your bbl threads and take a test piece of steel turned down to the major dia.' and run a test thread and see if it fits your action!

Hope this helps. If you're getting a Douglas bbl, I'm certainn they'll turn this for you. Harry B.

willsnipe · January 19, 2006, 04:11 PM

Thanks to all for your help. Mine is an old lathe, purchased used, short a lot of the extras that undoubtedly came with it. Can you tell me how to get hold of Douglas? That might be the answer.

Clemson · January 19, 2006, 04:29 PM

http://www.benchrest.com/douglas/

Lazy D · January 20, 2006, 09:46 PM

On metric threads of 22X1.5 the "22" is 22 mm in diameter and the "1.5" is number of threads per/mm. This is like SAE measurements "1/2 X 28" 1/2 inch diameter X 28 threds per inch. This is my understanding of metric thread cifering

Not sure if they are still a 60 degree pitch. I would check first. Good luck

Dave Haven · January 21, 2006, 12:01 AM

Quote:

...and the "1.5" is number of threads per/mm.

Actually, it's the number of mm/thread. They are a 60° V.

January 16, 2006, 02:15 PM	#1
willsnipe Member Join Date: October 30, 2005 Posts: 24	Mini-Mauser barrel threads? Have any of you folks barreled a Charles Daly Mini-Mauser? I'm thinking about one, but the only information I've come across says the threads are 22mm-1.5 which might be a real challenge on my lathe. Said information is from a 1989 magazine article, so anything could have changed since. Any help would be greatly appreciated.

January 16, 2006, 03:10 PM	#2
Clemson Senior Member Join Date: March 9, 2001 Location: Greenwood, SC Posts: 875	22x1.5 is correct. Metric threads. Clemson __________________ NRA Endowment Member, NRA Certified Instructor CWP Holder US Army veteran Gunsmith www.boltandbarrel.com

January 17, 2006, 07:17 PM	#3
Harry Bonar Senior Member Join Date: December 5, 2004 Location: In the Vincent, Ohio general area. Posts: 1,804	mini-mauser threads Dear Shooter: You should have gotten several gears with your lathe so you could cut the proper thread. But, all is not lost - Ha! Consult the "feed chart" on your lathe for the amount of advance it would be that would give you 22 TPI, set it for that and you'll probably be O.K. Now, I take it that it would be 22 TPI with a thread angle or pitch of 1.5?? Correct, I hope! Now 22TPI would be a tread (one turn) of .0455 ten-thosands, or rounded off to.046 tip to tip of threads (Hope I'm doing this right!) So, if you find in your tables a gear setting for .045 it will turn out to be 22TPI. (I think the best I can help you.) The way to test this is to chuck your removed bbl in your lathe and engage the thread lever with the tool almost touching the bbl. threads and check! You can grind your tool for the 1.5 piych to fit your bbl threads and take a test piece of steel turned down to the major dia.' and run a test thread and see if it fits your action! Hope this helps. If you're getting a Douglas bbl, I'm certainn they'll turn this for you. Harry B.

January 17, 2006, 07:20 PM	#4
Harry Bonar Senior Member Join Date: December 5, 2004 Location: In the Vincent, Ohio general area. Posts: 1,804	mini-mauser threads Dear Shooter: You should have gotten several gears with your lathe so you could cut the proper thread. But, all is not lost - Ha! Consult the "feed chart" on your lathe for the amount of advance it would be that would give you 22 TPI, set it for that and you'll probably be O.K. Now, I take it that it would be 22 TPI with a thread angle or pitch of 1.5?? Correct, I hope! Now 22TPI would be a thread (one turn) of .0455 ten-thosands, or rounded off to.046 tip to tip of threads (Hope I'm doing this right!) So, if you find in your tables a gear setting for .045 it will turn out to be 22TPI. (I think the best I can help you.) The way to test this is to chuck your removed bbl in your lathe and engage the thread lever with the tool almost touching the bbl. threads and check! You can grind your tool for the 1.5 pitch to fit your bbl threads and take a test piece of steel turned down to the major dia.' and run a test thread and see if it fits your action! Hope this helps. If you're getting a Douglas bbl, I'm certainn they'll turn this for you. Harry B.

January 19, 2006, 04:29 PM	#6
Clemson Senior Member Join Date: March 9, 2001 Location: Greenwood, SC Posts: 875	http://www.benchrest.com/douglas/ __________________ NRA Endowment Member, NRA Certified Instructor CWP Holder US Army veteran Gunsmith www.boltandbarrel.com

January 19, 2006, 04:11 PM	#5
willsnipe Member Join Date: October 30, 2005 Posts: 24	Thanks to all for your help. Mine is an old lathe, purchased used, short a lot of the extras that undoubtedly came with it. Can you tell me how to get hold of Douglas? That might be the answer.

January 20, 2006, 09:46 PM	#7
Lazy D Senior Member Join Date: December 11, 2004 Location: Indian Territory Posts: 192	Metric threads? On metric threads of 22X1.5 the "22" is 22 mm in diameter and the "1.5" is number of threads per/mm. This is like SAE measurements "1/2 X 28" 1/2 inch diameter X 28 threds per inch. This is my understanding of metric thread cifering Not sure if they are still a 60 degree pitch. I would check first. Good luck __________________ "Fast is Fine but accuracy is final.".....Wyatt Earp.