Re: Bobcad scores

R Rogers <rogersmach@...> wrote:

>
> You mentioned that Bobcad was telling your machine to take off

while it was making a Z axis move. From a G-code standpoint, this is
impossible. To issue a move and issue another while the original is
being carried out. It can't be done. It must complete the first.

>
> The only way this can happen is a machine that is lagging way

behind it's commanded position. It's issuing new commands before the
present one is fully carried out.

>
> In other words, has nothing to do with the Cad-Cam or G-code..
>
> Ron

I'm not a G-Code expert but I do know it's possible to write a G-Code
such as G0 X0Y0Z0 then write another like G0 X1Y1Z1 which on the
MaxNC machine results in movement in all three axes at once. The
problem as you've stated is taking off or moving in XY while moving Z
can cause unwanted impact to flat stock material (depending on the
situation). Unfortunately Bobcad 18 does generate G-codes with this
error which must be manually converted to a sequence like:
G0 X0Y0Z0
G0 X0Y0Z1
G0 X1Y1

(Simplified for illustration purposes, the actual program may require
use of minus sign.)

Now is there a setting on Bobcad to automatically eliminate these
manual program corrections? If so, I'd also appreciate a quick
lesson or tip on how to get it to automatically repeat in 3D with
increments in Z since my desktop machine tends to skate at anything
more than a 0.025" depth of cut. Repeating the program manually
writing in the Z increments is annoying. Thank you.

Kirk