Re: Gcode Arcs

A couple of things about the arcs in Bobcad & Vector

Vector rotates the coordinate axis to draw arcs anywhere in the rotated X-Y plane of view. Bobcad moves the plane of View to do the same.

Vector also has rotation available with any copy-paste. Bobcad can select and rotate entities.

Vector will generate proper G-code for arcs in normal planes(G17-G18-G19), and can also generate arcs with X-Y-Z-I-J-K coordinates if the arc is drawn in a skewed orientation. Few machines can machine these 3D arcs, but a few are starting to appear, especially as control programmers realize that Vector can generate these codes! Usually those that fall outside the normal perpendicular planes should be interpolated to tiny line segments that approximate the arc.

Bobcad will NOT generate anything but lines for any plane but G17-X-Y. There are no 3D arc capabilities. (through version 17)

Both systems have the ability to generate a spiral consisting of a series of adjoining lines in the shape of a helix. In this way they will both approximate helical interpolation on ANY 3 axis mill. Even one without a synchronized spindle. Neither one will generate a true X-Y-Z-I-J style helical arc or a thread milling cycle, without editing in the Z depth.




Best Regards, Fred Smith- IMService
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