gcode for threading ferrules

Chris Abaya Cues

AzB Silver Member
Silver Member
Hi all,

Can anyone share gcodes for threading ferrules (standard 5/16 x 18)? Or point me in the right direction?

I recently got a good deal on a used CNC 3040 locally and have been playing around with this new toy. :D

Thanks,
Chris
 
This is my take on threading on a router.
To be able to thread properly on cnc, you need a tachometer connected to the spindle and a radial reference point if it is to be cut more than once. Then the machine is in feed per rev instead of feed per minute. The tacho is important because the feed rate will vary to keep a constant feedrate, depending on its pre defined tolerance settings. In general G95 is feed unit per rev. G94 is feed unit per minute.
An example is you have it spinning at 50 rpm, you want 18 tpi, so 18 tpi is 1/18 = 0.05555 inches at 50 rpm that is 2.7775 inches per minute feed rate. If the spindle slows to 45 rpm, and the feed rate is still 2.7775 inches per minute, the pitch will actually be close to 16 tpi.
I hope this helps.
 
Oh , looks I read your post wrong. If thread mill is what you are after, google is your friend, here is one from Micro 100, they make some neat stuff for CNC,
http://www.micro100.com/programs.htm
Look at getting Fusion 360, model in Cad and the HSMWorks cam will output Gcode files for Mach3 or Mach4 . Free and works online.
Now days there are so many options for cad modelling and then producing the code. It has lots of options for the accuracy of what you are making as well.
 
Oh , looks I read your post wrong. If thread mill is what you are after, google is your friend, here is one from Micro 100, they make some neat stuff for CNC,
http://www.micro100.com/programs.htm
Look at getting Fusion 360, model in Cad and the HSMWorks cam will output Gcode files for Mach3 or Mach4 . Free and works online.
Now days there are so many options for cad modelling and then producing the code. It has lots of options for the accuracy of what you are making as well.

Thanks Neil!
 
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