Improving single point thread quality?

[rwm]

I’ve played with it. I mentioned earlier using an internal boring bar and the spindle in reverse. That way the tool forces aren’t lifting the carriage assembly, and I can see the tool. Makes me feel better.

I am not following this? Are you talking for internal threads?

 

[Ken226]

I am not following this? Are you talking for internal threads?

I believe he's talking about using an internal threading tool, like a boring bar with a threading insert. Threading the OD of the part on the back side, running the spindle in reverse. Threading away from the chuck, so that the cutting forces are directed downward.

 

[LVLAaron]

I believe he's talking about using an internal threading tool, like a boring bar with a threading insert. Threading on the back side, running the spindle in reverse. Threading away from the chuck, so that the cutting forces are directed downward.

Yep!

 

[LVLAaron]

OK we're cooking with gas. This fits my BAT M action perfectly. RPM's were very low but the carmex insert says it's designed for slow speeds. Saturated in cutting oil it pulled a beautiful and shiny chip.

 

[LVLAaron]

I'm having the time of my life!

 

[Illinoyance]

All the grief about compound angles on the lathe can be resolved by following one rule of thumb: The compound slideshould be parallel with the trailing flank of the cutter thentap it about 1/2* toward the cross slide. This works for V threads of any thread angle (60*, 55*, 47,5* orany other included angle) and Acme or trapezoidal threads. It works for external threads, internal threads, right or left hand threads.

 

[Mitch Alsup]

I'm having the time of my life!

There is a tiny section of "Houston Warehouse" that mentions cutting a bevel on the chamber end of the barrel and matching bevel inside the action creates better centering of the barrel in the action.

 

[LVLAaron]

There is a tiny section of "Houston Warehouse" that mentions cutting a bevel on the chamber end of the barrel and matching bevel inside the action creates better centering of the barrel in the action.

I did touch the edges lightly. Wasn't too worried about it as these are just paper weights

 

[rock_breaker]

Good looking threads!

 

[Henry Komorowski]

Thread away from the chuck. Makes threading trivial. Checkout YouTube JoePi

Threading tool upside down in the holder; spindle in reverse. You can also leave the half nut engaged and jog the tool back into position.


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Very good suggestion provided you do not have a screw on chuck which could UNSCREW if something goes wrong
with very bad consequences.