When things go badly!

[Scota4570]

Just tapped the nipple hole for my under hammer.  It was going weird.  It did not want to start.  Then it did not want to come out.

I found out how far I can throw a LEFT HAND 1/4 X 28 TPI tap. 

[bob in the woods]

Can you just make a couple of nipples with reverse threads ?   

[Bsharp]

I was just trying to make an internal thread on the lathe 11/32-32. Tried twice be for quitting and took a brake.

DUH!, I need to run in reverse when threading out.

My cutter was making threads in the brass, but my part wouldn't thread in, till the hole was way too big.

And I was using a left hand cutter.

One nice thing about 1/4-28 is that you can still go bigger if needed.

[Jim S]

Bsharp - that's an interesting one.
 I've never tried threading outwards and only a few times making an internal thread. Just trying to visualize that gets me confused!

[P.W.Berkuta]

Threading outwards on a lathe is the BEST way not to crash the tool into the headstock!

[Scota4570]

I cut off the offending part of the barrel and started over.  it will be about an inch shorter than planned.  Too bad, the original work was really precise neat.  I guess I will be cutting and crowning last in the future. 

[bluenoser]

Threading outwards on a lathe is the BEST way not to crash the tool into the headstock!

Or a shoulder

[Scota4570]

About threading left to right.  I have never done that.  For breech plug threads in barrels that would be handy. 

Is the lathe run backwards, with the tool upside down? 

On my day to day lathe the chuck is held on with threads.  Any problem with the chuck unscrewing? 

[Bsharp]

About threading left to right.  I have never done that.  For breech plug threads in barrels that would be handy. 

Is the lathe run backwards, with the tool upside down? 

On my day to day lathe the chuck is held on with threads.  Any problem with the chuck unscrewing?

Upside down and backwards, yes.

I have also started using 90 degrees and feed straight in. Using 60 degrees, you may hit the shoulder when feeding in.

My last 7/8-14 was done at 90 degrees and looks great.

I have a screw on chuck, never loosened.

My 1937 South Bend doesn't have a brake either, it just coasts to a stop.

[P.W.Berkuta]

Yes you are cutting upside down and the lathe is running in reverse. The chuck can unscrew but most/all of the time you are only taking light cuts. Go here and learn from this VERY SMART person <https://www.youtube.com/@Blondihacks>