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Working on my South Bend 9C

Hi Michael,

Sharp tools and less speed. I would have thought 150 to 300 RPM. Carbide inserts are not the best for cutting threads in brasses.
What feed and speed did you use ? Or if its a common thread a run over with a die might clean it up or make it too small.
 
I see some shrapnel hanging off the edges..... a couple things come to mind.
Sharper tool
Lighter cuts and more passes
Tailstock support, Its evidence can be removed at the end, just leave a length provision for that.
Clean up with a light filing and emory at the end.
 

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This little gem in the rough is probably worth inquiring about...... I have been mulling it over for awhile. If you look closely it's a tool grinder lying on its side with one table missing. It could be a game changer.

Yes...... I surrendered and joined facecrack.
 
BaronJ said:
What feed and speed did you use ?
Click to expand...
70 RPM if the manual is to be believed!

140mower said:
Sharper tool
Click to expand...
Yes I'm looking for some other options. I've had better results with some of my inserts, this was a single piece carbide.

140mower said:
Lighter cuts and more passes
Click to expand...
This was... 5 passes: .005x3, .002x2

140mower said:
Tailstock support, Its evidence can be removed at the e
Click to expand...
Because of some shenanigans I didn't think I could, but now I realize I actually can, so that's on the list!

140mower said:
Clean up with a light filing and emory at the end.
Click to expand...
Did not do any clean up, will have to see what I have on hand for next time.
 
Hi Michael,
A file will remove most if not all surface debris, but using a stone will give it a polish.
I think that your thread cutting tool wasn't sufficiently sharp, a problem with general carbide inserts. Ones intended for aluminum are much sharper and will provide a better finish. They also cost a little more !
 
I do think the tool is a likely culprit. I was using a different kind (attached). I had cleaner results with an aluminum insert in a different holder, but I need to find one that is small enough to work in a <0.400" bore...
 
Hi Michael,
The only way you are going to get a threading tool into a 0.40" thou bore is to make your own from HSS !
Or use a tap the right size and grind half of it away so that you have a tool that will cut and go inside your bore. I've salvaged a tap that I've broken before now to thread a very small hole.
 
Hi Michael,

By gum that looks like a flimsy tool ! Its going to chatter no matter what you do with it.
You could try wrapping some plumbers lead solder wire around the shaft in an effort to damp the chatter out.
 
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