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Mach 3 Thread Canned Cycle


I noticed that GW Editor defines G76 as: “G76: Fine boring canned cycle” for Mach 3 Lathe Metric.   Apparently G76 is a canned cycle for threading on Mach3 Lathe.  Have I missed something that I can’t find the threading canned cycle on GW Editor?

Mach3 Turn G76 Threading Cycle Format

G76 X Z Q P H I R K L C B T J

X – End value in x-axis.
Z – End value in z-axis.
Q – Number of Spring Passes. (optional)
P – Thread Pitch
H – Depth of first pass and subsequent passes.
I – Infeed angle.
R – Thread start point in x-axis (optional).
K – Thread start point in z-axis (optional)
L – Chamfer – thread run-out (optional)
C – X-axis clearance for rapid return.
B – Depth Last Pass (optional)
T – Taper (optional)
J – Minimum depth per pass (optional)

C – gives the X clearance for the rapid return motion. It is always specified as positive and Mach3 handles the reversed direction for an internal thread.

Q – gives the number of spring passes (i.e. cuts at the X end position).

I – gives the infeed angle in degrees. This is Zero for radial infeed and typically 29 or 29.5 degrees for a unified or ISO metric thread or 27 degrees for 55 degree angle forms like BSW or BSF.

L – retract or chamfer angle is a “rotational angle” and not an actual chamfer.
L90 would retract over 1/4 of a revolution
L360 would be 1 rev.
L720 would be 2 rev.

according to:


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Henk, you’ll need the latest GW Editor release for that–the support for G76 is pretty new as I write this.  You can just click the “Help” menu near the top of the page to find the download links.

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