Gunsmithing picking internal threads

[GasLight]

When you gunsmiths are truing the interior threads of a Remington 700 action, how are you picking the threads? When I am picking them up on external threads it seems pretty easy, lock down the thread lever, and then adjust with the cross and compound until the threading bit is perfectly aligned. I am having trouble wrapping my mind around how to line it up on the interior?

Thanks for any tips

Dave

 

[treebasher]

Re: picking internal threads

It should be the same except for your compound angle.

Here are a couple of links:

http://www.practicalmachinist.com/vb/south-bend-lathes/how-pick-up-thread-128748/

http://groups.yahoo.com/group/southbend10k/photos/album/2121999836/pic/list

 

[GasLight]

Re: picking internal threads

It is basically the same process, but when I pick external threads, I can see how the threading tool lines up, with internal threads you are basically blind? Guess I am wondering if there is a good way to do this without slamming the carbide around too much and chipping it

 

[CS223]

Re: picking internal threads

Optivisor, Dykem, and a bright light.

 

[ScottWatkins]

Re: picking internal threads

Pick it up by using the face of the first thread. This way you can see alot easier and not have to worry about being on the inside.

 

[wnroscoe]

Re: picking internal threads

It's the same process as external threads but, on the internal threads, I use a step stool, magnifying glass and bright light. I look over and into the receiver making my adjustments as needed. The machine is off of course, the E-stop set. Once set I adjust my depth of cut with the cross slide only and not the compound.