HSS inserts for PM Threading Kit Holder Tool

D

Dlwheel

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What HSS inserts will work in the threading tool that comes with the tool holder in the kit?
The RH tool actually has a different (larger) diameter in the insert than the other inserts.
I am only ext. threading 1.25" SS.
As I experimented with the provided carbide insert, threading at 70rpm's does not leave a very nice surface.
I'm sure some of that is me.
Thanks.
 
70 rpm is probably the issue. Try about 800-1000 rpm to start with. Carbide likes speed. You didn't mention what lathe it is...
 
While we are at it, how about depth of cut, feed rate, lubricant if any. A photo of the setup would also be helpful. Maybe we can avoid 20 questions...
 
Bob Korves said:
While we are at it, how about depth of cut, feed rate, lubricant if any. A photo of the setup would also be helpful. Maybe we can avoid 20 questions...
Click to expand...

Too late... ;)

Good morning Bob. :D

And I agree with Bob, in that there is not enough information provided to give a good answer. These (questions) are a good place to start.
 
Sorry. I’ll get back to you when I get it all together.
The rifle barrels are 416 SS.
Tap Magic with a brush.
.005 depth of cut on the compound.
135rpm.
16tpi on a .950” tenon in 1.0625 diameter.
Let me get my crap together and I’ll get back to you.
Thanks for getting me started.
-David
 
You need sharp coated carbide for 416. Run dry. Try 500-800 rpm. And don't dwell with the cutter in the part. 416 work hardens pretty quickly.

Just some thoughts. :)
 
wrmiller said:
You need sharp coated carbide for 416. Run dry. Try 500-800 rpm. And don't dwell with the cutter in the part. 416 work hardens pretty quickly.

Just some thoughts. :)
Click to expand...
Trying it now. Was surprised by the ‘dry’ part.
 
Maybe an obvious question, but wondered how the threaded tenon was done in practice. Turning to a shoulder at 500-800 rpm, things would happen fast. 0.95" at 16 tpi 500rpm=5 sec. 800=3.13 sec. Do you turn to a hard stop or turn "backwards" away from the chuck? Joe Pieczynski has a youtube video showing How to thread away from a stop with the tool upside down and lathe in reverse. Other videos show tool on the back side of the part, lathe in reverse. Preference? Or are there other ways to do it. Slowing down and using HSS might also be an option for surface finish.
 
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