Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: paulc on November 17, 2014, 05:25:21 AM
-
Hi All,
Im just playing with my buddies Surfcam 2000, Im fumbling with it really. Anyway I selected the inside of a 42mm dia circle. Profiling. Tool diam in SC is 8mm and TIP selected. When I place a pencil in the machine it scribes a 68mm dia circle. Why is this so big. Id expect the pencil to draw a 34mm circle. ie 42-8mm tool dia =34.
See the G code surfcam created. Perhaps Mach3 doesn't like the post type?
%
O0
G17 G40 G80 G90
T21 M6
S1194 M3
G0 G90 G54 X-17. Y0
G43 Z25. H21 M8
G0 Z2.
G1 Z0 F71.6
G3 I17. J0 F143.2
G0 Z25.
G0 M9
G28
M30
%
-
Hi Paul,
Looking at your Gcode, the circle comes out at 34mm diameter here.
Perhaps you have your motor steps per unit set incorrectly ??
Tweakie.
-
I sure the the steps are set ok. Becuase when I measure straight movements in X and Y they are perfect. Ie if I ask X to say move 50mm it moves 50mm same for Y, this is confirmed. Also the circle is perfectly round just not the right diameter (68mm). I could only think it was the post processor churning out the wrong code someplace.
-
Problem solved by Jeff Birt, he advised I needed to change the "IJ" settings in mach3 general config to incremental not absolute as it was set as.
All good now :)