Power Path 15 Threading Help - Bad thread form

Hello All!

New Powerpath 15 lathe user here. I'm just getting the lathe up and running and am having issues getting a nicely formed OD thread. I'm using the Powerpath controls for the operation, but may switch to g-code for a bit more control.

I'm doing M6x1. threads starting with an od of .231, lead of .0394, height .0225, engage angle 29. Initial DOC .005, then .003 with a min of .002.

The insert I'm using says to run at 260-590sfm for steel, my stock is cr mild steel. I have rpm set at 4000. The actual rpm is about 5.5% lower than programmed at 100%.

After I ran the cycle I ended up with an OD of .2355 and the profile just about looks like I have double threads.

I plan on doing a LOT of threading for the various parts I'll be making and really need to get this process down. Steel, 4130, SS and aluminum.

My lathe came with a flat screen, I did the USB drive conversion, replaced a proximity sensor for the chuck clamp and the main board. I thought this was the most unintuitive software until I realized I was missing some colors and couldn't see the white colored keyboard symbols to tell me which button to push for all of the softkeys. The board fixed that and I also upgraded to the latest software version. I don't have a tool setter or parts catcher, but do have a chip conveyor. If anyone has a tool setter or partscatcher they want to get rid of, let me know!

Thanks!

Alex

Attachment 251670

try cutting slower 250rpm,lead.0394, thread height .0295, angle 30 degree, first cut.002 succesive cuts .001 min. .001

Thanks for the response Riverside192. I played around with the parameters all day and ended up with a nice thread using Lead .0394, thread height .0325, angle 5 degree, first cut .010, successive cuts at .050 and no less than .004. Starts thread diameter at .231. RPM 1000. Stock cut at .229. The other thread in the picture is from a hardware store bolt I used to compare it to.

Attachment 253066

Also start at least .2 inches in front of the part so the carraige settles in.