Hi, I need to make a tapered thread with Mach4 Lathe hobby version.
I tried to execute instructions on the pdf, using the G32 and the K value.
but nothing happens, always straight.
where am i wrong?
do you have any examples?
thank you!

Have you tried the threading in the turn cycles?  I just did and it gave me the code. 12 tpi, .050 thread depth, 7 degree angle, from z0 to -.5 , xi0.5

N0 (Machine type - MachMotion Lathe Canned Cycles)
N5 (Filename: C:\Mach4Hobby\Wizards\LatheCannedCycles\Cycles\ThreadingCycle-0.tap)
N10 (Generated on 2/7/2021 at 12:58:10 PM)
N15 G00 G40 G54 G64 G80 G90.1 G99 G18 G20 (Safe Start Block)
N20 %


N25 %
N30 G00 G40 G54 G64 G80 G90.1 G99 G18 G20 (Safe Start Block)
N35 %


N40 %
N45 (Starting Gcode for Threading Cycle: ThreadingCycle-0)
N50 G50 S1000 (Spindle Speed Cap)
N55 G00 G40 G54 G64 G80 G90.1 G99 G18 G20 (Safe Start Block)
N60 %


N65 %
N70 T0101 (Tool Change)
N75 G99 (Feed per Revolution)
N80 G97 S700 (Constant Speed)
N85 M03 (Spindle Forward)
N90 M09
N95 G00 X0.7000 Z0.1000  (Rapid move to Clearance Height)
N100 G76 P020030 Q0.01 R0.003 K1
N105 G76 X0.33860771954855 Z-0.5 R0.061392280451452 P0.05 Q0.01 F12.0
N110 G80
N115 (End Gcode for Threading Cycle: ThreadingCycle-0)

N120 %
N125 M09
N130 M05
N135 M30
N140 %
N145 (End Gcode file)
N150 %

hi, i can't use turning cycles.
I have a small 15 inch screen
windows don't fit enough so they're useless to me.
thanks, I'll try as you suggested !!

You simply change the start to the end position Easy! Notice the start and the end in his example are not the same

I have used the G76 cycle very often with Mach4.
your example is not a conical thread.
it is a simple linear thread, (the classic).

Load the example and run it.Fanuc G76 Threading Cycle Explanation
N5 G76 P010060 Q100 R0.05
N6 G76 X30 Z-20 P1024 Q200 F2
First block of the G76 Threading cycle
G76 : G code for threading cycle.

P : P actually consists of multiple values which control the thread behavior,

01 : Number of spring passes or spring cuts.
00 : Thread run out at 45 degree
60 : Flank angle or Infeed angle
Q : Depth of normal cut ( these values are given in hundreds, so the depth of cut will be 0.1 ).
R : Depth of Last or Finish cut

Second block of the G76 Threading cycle
G76 : G code of the threading cycle.
X : The end value in x-axis.
Z : The end value in z-axis.
P : Thread depth ( as radius value ).
Q : Depth of first cut.
F : Thread Pitch
R : Thread Taper

I wrote the threading cycle I was thinking you only had to change the X axis end position . it is has been a few years!

first question.
Does Mach4 support tapered thread?
example on Fanuc:
T7
G97 S1000 M3 G95
G0 X26 Z6
G78 X23.5 Z-30 R-2.4 F1.5
X23.1
X22.8
X22.52
X22.32
X22.22
G0 X100 Z100

Are you talking like a pipe thread ? Yes if you want to do some odd shape thread you will need to do it with G31's

Yes, right!
where can i find an example?