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General Mach Discussion / G76 issue

« on: August 09, 2009, 01:14:25 PM »

I am using MACH3 turn and and I am having a problem with the G76 code.  I used the Wizard to thread a .25" end of a 2.16" tube.  I don't add Chamfer or taper but I get all sorts of odd paths while threading.  First an chamfered cut front to back, next a straight cut then a deeper angled cut ... until it gets to depth.  Then it does an reversed chamfer on the back end of the thread.  Is this normal?  Here is the Gcode:

G00 z2.1
G00 X1.1
M04 S400
M01
M08
G76 x1.0 z1.75 q1 P0.08333 H0.02 I29 C0.1
M9
M5
M30

Any help would be appreciated.

BOb