PMA barrel mic, will it fit over a 1-1/8th tenon?

[LVLAaron]

PMA Barrel Micrometer

The highest quality, most innovative reloading tools and shooting supplies for precision riflemen. Unparalleled customer service. Shop Now - PMA Tool

www.pmatool.com

Will this work with a 1.081 pitch diameter tenon? It says it's good for up to 1.075 - Can I bore out a couple thou from the body without some other negative consequence?

 

[TylerFromMS]

PMA Barrel Micrometer

The highest quality, most innovative reloading tools and shooting supplies for precision riflemen. Unparalleled customer service. Shop Now - PMA Tool

www.pmatool.com

Will this work with a 1.081 pitch diameter tenon? It says it's good for up to 1.075 - Can I bore out a couple thou from the body without some other negative consequence?

Up in it where the micrometer is is flat. I bet you could.

 

[xr650rRider]

You can bore it, just be a little sloppy fit but not a big deal. They are so easy to make. $50 micrometer spindle off of Ebay and $5 worth of 12L14. Maybe $10 for a precision 1" bearing.

 

[jkohler]

Just make your own it’s every easy

 

[hoz53]

You can bore it, just be a little sloppy fit but not a big deal. They are so easy to make. $50 micrometer spindle off of Ebay and $5 worth of 12L14. Maybe $10 for a precision 1" bearing.

xxx

how do you use that tool to measure the length of tenon on a rem counterbore barrel or a fixed breach with chember allready there? A .100 disc would work except you mite wanna take this measurement while the barrel is horizontal— like in the lathe. just been wondering. Thanks

 

[Dusty Stevens]

Bore it

 

[xr650rRider]

@hoz53 said:
how do you use that tool to measure the length of tenon on a rem counterbore barrel or a fixed breach with chember allready there? A .100 disc would work except you mite wanna take this measurement while the barrel is horizontal— like in the lathe. just been wondering. Thanks

I'd use a depth micrometer to measure tenon length. It's more of a barrel duplicating tool. You use a headspace gauge in conjunction with the 1" ball (might have to use a different 25 degree or 30 degree disk if the 1" ball doesn't contact the chamber edge. Take measurements from a known good barrel and using the measurements, you should be able to duplicate it. Some actions are glue-ins. If your not an FFL, you might not be legal to possess the action.

 

[hoz53]

@hoz53 said:
how do you use that tool to measure the length of tenon on a rem counterbore barrel or a fixed breach with chember allready there? A .100 disc would work except you mite wanna take this measurement while the barrel is horizontal— like in the lathe. just been wondering. Thanks

I'd use a depth micrometer to measure tenon length. It's more of a barrel duplicating tool. You use a headspace gauge in conjunction with the 1" ball (might have to use a different 25 degree or 30 degree disk if the 1" ball doesn't contact the chamber edge. Take measurements from a known good barrel and using the measurements, you should be able to duplicate it. Some actions are glue-ins. If your not an FFL, you might not be legal to possess the action.

Right— I know that stuff. I to use a depth mic to measure tenon length but would sure be nice to use something like this to measure tenon length - dont ya think- and i know there are some people that do. just gotta figure it out. Its perfectly legal here for me to possess a bolt acton rifle action. Thanks for your help

 

[butchlambert]

I did this one many years ago and gave it to Nez.

I made 2 threaded ones that I use now with the 16&18TPI. The valve is for the bolt nose clearance. I have one for the Bats and another for Kelbly's and others.

The vertical lines allow me to locate the proper location of the lettering on your barrel.

 

[xr650rRider]

Right— I know that stuff. I to use a depth mic to measure tenon length but would sure be nice to use something like this to measure tenon length - dont ya think- and i know there are some people that do. just gotta figure it out. Its perfectly legal here for me to possess a bolt acton rifle action. Thanks for your help

Another piece of duplicating a barrel. Indexed for barrel marking, so you write it down for action your chambering for. That piece is threaded 18 pitch for Panda. You measure it's OAL and scribe it on the side. Use your depth mic over to the side and measure to the end of the tenon. Little math and you have your tenon length. You can make it slip on just as easily but I use the index marks, so threaded makes it dual use.

 

[butchlambert]

Another piece of duplicating a barrel. Indexed for barrel marking, so you write it down for action your chambering for. That piece is threaded 18 pitch for Panda. You measure it's OAL and scribe it on the side. Use your depth mic over to the side and measure to the end of the tenon. Little math and you have your tenon length. You can make it slip on just as easily but I use the index marks, so threaded makes it dual use.

View attachment 1407432

Hum, just like my photo above.

 

[LVLAaron]

I like that Butch.

Yes, I want to chamber barrels without having the action. I’ve built a little threaded collar to keep track of how to properly clock the barrel for the action.

 

[LVLAaron]

Another piece of duplicating a barrel. Indexed for barrel marking, so you write it down for action your chambering for. That piece is threaded 18 pitch for Panda. You measure it's OAL and scribe it on the side. Use your depth mic over to the side and measure to the end of the tenon. Little math and you have your tenon length. You can make it slip on just as easily but I use the index marks, so threaded makes it dual use.

View attachment 1407432

That’s effectively what I made. I need to get out the rotary table and engrave the marks on it.

 

[butchlambert]

I like that Butch.

Yes, I want to chamber barrels without having the action. I’ve built a little threaded collar to keep track of how to properly clock the barrel for the action.

I keep a book with the info for each barrel. I will not need the receiver anymore to chamber a new barrel for each receiver.

 

[gunsandgunsmithing]

I did this one many years ago and gave it to Nez.
View attachment 1407395
I made 2 threaded ones that I use now with the 16&18TPI. The valve is for the bolt nose clearance. I have one for the Bats and another for Kelbly's and others.
View attachment 1407398
The vertical lines allow me to locate the proper location of the lettering on your barrel.

The top one is pretty much identical to one I'm making some of right now and posted a thread on. I didn't steal it from ya, I promise. Great minds just think alike! Lol! Do you find the window worthwhile? I put one on one, just to see if I wanted it. Didn't see a lot of value to it but just wondering your thoughts. Not a big deal to add.

 

[butchlambert]

That’s effectively what I made. I need to get out the rotary table and engrave the marks on it.

Use an indexing head in your mill.

 

[xr650rRider]

My lathe has electronic lead screw and I can change to displaying the position from 0-359.9 degrees. Then used a carbide boring bar in a toolholder for scribing. Spin indexer works well too.

 

[xr650rRider]

Hum, just like my photo above.

Other than yours has a mic in the center. I copied mine from a local smith that's been in business since 1965.

 

[butchlambert]

Other than yours has a mic in the center. I copied mine from a local smith that's been in business since 1965.

Yes sir, one tool instead of 2. They all work.

 

[hoz53]

I did this one many years ago and gave it to Nez.
View attachment 1407395
I made 2 threaded ones that I use now with the 16&18TPI. The valve is for the bolt nose clearance. I have one for the Bats and another for Kelbly's and others.
View attachment 1407398
The vertical lines allow me to locate the proper location of the lettering on your barrel.

Thanks for that info Butch. Those tools are interesting.