tool bit/inserts for turning

[WSnyder]

I built this fixture for actions and dies.

@tonyben This ^^^^ is the Bryant style I was referring to.

 

[ELR LVR]

I always clean up the action face, and pin the recoil lug.
If the threads aren't perfect... just turn your tenon thread another couple of thou.

Yes, the angled profile of the threads will tend to center things up themselves

As long as your barrel shoulder meets the action face properly, the threads don't matter.

My two cents.

This is my opinion as well, ^^^
since there is tolerance in the threads (slightly), and when the 2 mating surfaces are parallel,
(Tenon and front of action)
and the lug is square to them, and the barrel tightened down.
Any tolerance/clearance in the threads will be taken up
The threads are merely there to provide a ramped leverage advantage of squeezing the mating surfaces together.
If this can be accomplished by torquing down the barrel square to the action
The important thing is the barrel won't wiggle, vibrate etc and that there is no air between the mating surfaces at the junction
---
I did know of one gunsmith who said he trued the action threads with an appropriate Tap
I still do not see how he could hold it rigid enough with his 12x36 to true existing threads by using a center at the end of the tap but - hey that was his claim/method for what that's worth.
Maybe some guys simply chase the existing threads with a tap and called them trued?
---
I have never trued any threads on a Rem 700 Action for example
Instead I choose to lap the Tenon/Action threads for a smooth, gall free, mating contact
By lapping the threads to each other, you provide more thread contact
which is basically the same thing one would accomplish by truing the threads of the action.
There may not be Full thread contact, but there WILL be more contact
If your threads only have contact at 12 O'clock when tight and you lap them together
then you may have 11 - 2 O'clock contact
Then you can color blue / sharpie the threads and see where you have contact and keep going if you wish
I usually see a lot of sharpie marred or gone due to thread contact when I have checked
---
Also when I chamber and thread the tenon, I am continuously screwing the action on and off anyway to check for headspace.
if the thread were crooked or out very much it would be visible by seeing wobble of the action..
I've yet to see one that bothered me in any way
---
However --- with all things Factory Remington, I would be more willing to believe somebody got an action where the threads were noticeably crooked, and from there on it became a Gunsmith selling point to convince everyone they needed it, just like convincing everyone they must need the boltface trued up
(not if it aint out much) to a machinist that means not more than 2 thou
Most of us can see 5 thou of wobble, being out, crooked with our naked eye, using light, Dykem etc
---
Q., how many of us have a Remington with its skinny/non ground recoil lug that shoots lights out?
---
I would focus more on getting a perfect, burr free, exit crown without using a countersink

 

[tobnpr]

I did know of one gunsmith who said he trued the action threads with an appropriate Tap
I still do not see how he could hold it rigid enough with his 12x36 to true existing threads by using a center at the end of the tap but - hey that was his claim/method for what that's worth.

Both Manson and PTG sell tooling (I own Manson's but have rarely used it) which consists of piloted mandrels for a reamer and tap. Mandrels assure perpendicularity with bolt raceway. Reamer removes ten thou from internal receiver threads first. Then the tap- which is ten thou over spec recuts the threads oversize and true.

Despite naysayers screaming "it's not as good as single-pointing" it IS (indicators don't lie), but rarely is it needed. BIG downside nowadays is that prefits can't be used for rebarreling, and much of the time someone will say they want a "trued" action rebarreled when there is no documentation as to what exactly was done...

JMO, YMMV

 

[LVLAaron]

action rebarreled when there is no documentation as to what exactly was done...

That's why ya need a laser.

 

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