[mcode]

X values in a lathe are from spindle center(X0) so when a tool is commanded to go to X0 then the tool should be at spindle center.
I wrote an application to generate the code I sent, you could look up the math used to create the Elliptical geometry then
write a macro to generate the path. NcPlot can generate the path using that macro by using the program expand feature.

hope that helps

[Kiwi]

.......You may need to change the I/K positive/negative. (watch first line, I is different to others.)
Try this version.

G01 X0. Z0.
G03 X0.401 Z-0.024 I0.0005 K-3.3543
G03 X0.8 Z-0.097 I-0.4729 K-3.7119
G03 X1.195 Z-0.219 I-0.8737 K-3.5293
G03 X1.585 Z-0.387 I-1.3137 K-3.5863
G03 X1.967 Z-0.603 I-1.8806 K-3.7717
G03 X2.339 Z-0.865 I-2.5306 K-3.9882
G03 X2.699 Z-1.171 I-2.8982 K-3.7744
G03 X3.047 Z-1.52 I-3.8806 K-4.2175
G03 X3.38 Z-1.91 I-5.5292 K-5.0583
G03 X3.696 Z-2.34 I-6.1122 K-4.8229
G03 X3.994 Z-2.807 I-6.382 K-4.401
G03 X4.273 Z-3.309 I-7.668 K-4.5902
G03 X4.531 Z-3.843 I-8.7816 K-4.5721
G03 X4.767 Z-4.408 I-10.3829 K-4.6687
G03 X4.98 Z-5. I-13.7146 K-5.2688
G03 X5.168 Z-5.616 I-13.1457 K-4.3487
G03 X5.331 Z-6.254 I-13.4298 K-3.771
G03 X5.469 Z-6.91 I-16.3503 K-3.7821
G03 X5.579 Z-7.581 I-17.7481 K-3.254
G03 X5.663 Z-8.264 I-18.5442 K-2.6274
G03 X5.719 Z-8.955 I-19.216 K-1.9051
G03 X5.746 Z-9.651 I-17.1213 K-1.0127
G03 X5.75 Z-10. I-15.2231 K-0.349

Did you get this code to work?

[STEVE GRIMES]

Hi
is this in MM or inches
thanks