Re: Need G Code help

--- In CAD_CAM_EDM_DRO@yahoogroups.com, EdFanta <atex57@u...> wrote:

>
> Got the mill up and running and have been getting used to EMC. The

main

> reason for going to EMC was the cutter comp with G41 G42, that way I
> don't have to rewrite the code when I sharpen an endmill. Now I

want to

> mill a pocket with radiused corners, the following is a bit of the

code

> I have written along with the problems. I hope the formatting comes
> through.
> %
> m6t1 tool 1 is a 1/2 endmill
> g0x10y1 this is a starting hole already drilled
> g1z-.25
> g41d1y2
> g1x8.9y3.25
> g3x8.15y2.5r.75 an error comes up "concave corner with cutter

radius

> comp"
> If I change the r.75 to r-.75 it will go with out a quibble but the

back

> plot shows a loop instead of a radius.
> Any help appreciated, if you can point out my backwards thinking and
> explain the problem it would be a BIG help. TIA. Ed.

Tool radius compensation is a difficult function to implement
I have not seen a Pc-Controller yet that was able to do this
correct.
Many claim they do but fall short usually sooner then later.
Tip: You may be able to work around the problem using I and J
convention instead of R values when interpolating circles.
as in
G1X8.9Y3.25
G3X8.15Y2.5I0.0J-.75
in the above example you can also omit the I entry entirely
because the value is zero.
Good Luck