Citizen L20 Threadmilling from live cross tool

[CitizenBrian]

For anyone wanting to try thread milling from a live cross tool below is a proven example. Hope it helps.

HELICAL INTERPOLATION “THREADMILLING”
¼-20 THREAD FROM CROSS WORKING LIVE TOOL
Citizen L20 type 7

M5
M58S3=2000
T0600(X-THREADMILL)(1/4-20)
(3/16 DIA 20 PITCH THREADMILL)
G50W-.590
M18C0.
G50C0.
G0X#814+.1Z.250Y0T06
G98G1X0F50.(Starting at bottom of hole and threading up) (Note1)
G19
G1G41W.0312F2. (Note2)
G3Z.2812X.100V0K-.0312P1 (Note3)
G1G40Z.250
G18
G0X#814+.1T0
G50W.590
M60G99
M20
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G3 Z_X_V_ K_P_
Z = Location point plus “W” equals “Z”
X = Finish point
V = Haven’t used it yet but I think it’s equal to a “Y” location
K = Equals “W” just change to a minus value
P = Equals number of pitches divided in half

Note1: The distance from “X” start point to “X” finish point need to be full pitches. For example with a pitch of .050 for a ¼-20 thread and starting at X0 you can finish at X.05, X.100, X.150 and so on.

Note2: “W” equals your thread major minus your tool diameter divided in half.

Note3: The amount of revolutions needed (“X” start, “X” end, and “P”) to complete your thread will vary depending on how many teeth your threadmill has.

[MCImes]

Awesome! I havent needed to do this yet but sooner or later I know I will. Copied and stored for later use. Thanks in advance.