Threading on Sherline lathe
22 Apr 2017 15:08 #91845
by andypugh
Replied by andypugh on topic Threading on Sherline lathe
G76 should work. But your spindle speed will be a problem.
If you can't get more Z speed the other option is to turn the spindle by hand. LinuxCNC can still sync to a hand-cranked spindle.
If you can't get more Z speed the other option is to turn the spindle by hand. LinuxCNC can still sync to a hand-cranked spindle.
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- Boltonbrass
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22 Apr 2017 15:47 #91849
by Boltonbrass
Replied by Boltonbrass on topic Threading on Sherline lathe
I used a gear reduction attachment from Sherline and I made perfect threads this morning.
Thank you for the help. Next will be to get the 5i25 mess kit to work.
Thank you for the help. Next will be to get the 5i25 mess kit to work.
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03 Aug 2017 18:37 #96982
by techrat
Replied by techrat on topic Threading on Sherline lathe
Just jumping on this thread (Pun intended) quickly as I have been battling with getting G76 to work predictably on my lathe. I am wondering if you had more difficulty with G76 or G33? Did you start using G33 and saw better results? My current challenge may be related to the Q factor on G76 as it appears as though my tool is advancing too far with each subsequent pass and I end up with a wide flat at the root of the tread and a sharp point on the top of the thread.
I will probably work with G33 to simplify and see if this helps but am also interested in your experiences with switching between the 2 G Codes.
Thanks,
Jeff
I will probably work with G33 to simplify and see if this helps but am also interested in your experiences with switching between the 2 G Codes.
Thanks,
Jeff
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07 Aug 2017 10:41 #97099
by andypugh
Replied by andypugh on topic Threading on Sherline lathe
Why not try a smaller value for Q if you think that is the problem? On manual lathes I have typically used a value of 0 and it works fine. (ie, apply cut with the cross-slide not the compound)
What type of thread are you cutting? Commonly used thread angles vary between 47.5 (BA) and 80 degrees (Panzergewinde) and you would typically set Q to fractionally less than half the thread angle.
I have never checked, but it is possible that the angle changes depending on whether one is in radius mode or diameter mode (it shouldn't, but....)
What type of thread are you cutting? Commonly used thread angles vary between 47.5 (BA) and 80 degrees (Panzergewinde) and you would typically set Q to fractionally less than half the thread angle.
I have never checked, but it is possible that the angle changes depending on whether one is in radius mode or diameter mode (it shouldn't, but....)
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07 Aug 2017 11:36 #97101
by techrat
Replied by techrat on topic Threading on Sherline lathe
Thanks for the reply! Over the weekend I decided to go through everything from the ground up and double checked my set-up. In the end, it boiled down to some really basic errors in the physical set-up of my machine rather than the program or control. After re-grinding the tool myself and setting it properly, my test thread came out perfectly first try.
Just a good reminder for me to start at the beginning when troubleshooting.
Thanks Again,
Jeff
Just a good reminder for me to start at the beginning when troubleshooting.
Thanks Again,
Jeff
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