threading macro help

[Moray]

You don't need the conversion. Tom was highlighting what the 0.017xxx number was doing.

All you should need is

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#5=[tan[#6] * #1]  ( Increment for Z-axis per pass )

[turbothis]

great

[turbothis]

interesting
at 29 degrees it sure looks like 45 on the g viewer?

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( threading starts at Z zero )
G20 G18 
G00 X0.5 Z0.0  ( Clear plane )
M04 S500       ( Set spindle speed to 500 RPM )
G04 P3         ( Dwell for 3 seconds )

#1=[0.0025]    ( Depth of Cut )
#2=[0.40]     ( Total depth of thread )
#3=[0.560]     ( Length of thread / start position )
#4=[0.0394]    ( Thread pitch / per rotation )
#6=[-29]        ( Desired angle in degrees )

#9=0           ( DOC so far )
#10=0          ( Cumulative Z-axis movement )

( Calculate the Z increment based on the angle and DOC )
#5=[tan[#6] * #1]  ( Increment for Z-axis per pass )

M100

M98 P100 L[#2/#1]  ( Number of passes = total depth / DOC )
M2

O100
X-#9     
#9=[#9+#1]       ( Increment DOC )
#10=[#10+#5]     ( Increment cumulative Z-axis movement )
G32 Z#3 F#4
G0 X0.200 
Z-#10            ( Increment cumulative Z-axis movement )
M99

[turbothis]

45 looks pretty flat

[TomKerekes]

I think you have X in Diameter mode. In that case you'll have to move X double.

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X[-#9 * 2]     

[turbothis]

thanks as always