G33 Help

[ckrantz]

I have this example of a thread G33 code I'd like to have broken
out and explained what each of the different perameters below mean to
the cut .. Also I have a 16TPI lead screw, what would my K value be?

G33 z-1.25 K0.050 ;20TPI to Z-1.25

Does this mean that is going to thread 20TPI 1.25" from where I put
the tool?

Does this mean all I need to do is setup where I want the tread to start... set the depth.. then execute the gcode.. and bam I have 1.25" of 20TPI
thread?

I've done a search for threading and G33 on here already, there wasn't much listed there.

[HuFlungDung]

The G33 is pretty simple: its just a Z movement and a feedrate. I would guess that the feedrate should have an "F" address, not "K", but it all depends on how your controller software was written. The G33 is simply a command that the machine "knows" that it is supposed in initiate movement when it gets a signal from an encoder on the spindle.

So basically you have to program the whole path, including all retractions and feed to depth movements. You should watch that you return to the exact same start point all the time, unless you are experienced enough to want to stagger your cuts a little bit.

[ckrantz]

Is there a formual to figure feed rate on a 16TPI lead screw? Like if I needed to run 2 inches of 16TPI what would I run as my feedrate??

[miljnor]

on a lathe if its feed per/rev. its 1/TPI or in your case 1/16 = .0625 or f.0625.