Re: Need G Code help

I have not programmed for EMC, mostly I write programs for Mits. and Fanuc =
controls so this is a guess.
First off does EMC use type 1 or type 2 offsets? With type 1 there is only=
a single value per offset number so on a machine with a 20 tool changer we =
normally use offsets 1-20 for tool length and 21-40 for radius comp. Type 2=
each offset number actually a line in a table with values for tool length, =
length wear, radius, and radius wear.
I assume there is more to the program since you do not have a G43 line to t=
urn on length comp. That should not affect your question. Make sure that i=
t is using the correct values for radius comp, and that the wear value is ze=
ro if there is one. I normally do this by running with the cutter raised ab=
ove the part, single step on, and feedrate over ride turn down so I can watc=
h the distance to go display as each program line is processed.

Second what is the line after the G3 line? That could have some affect on =
how the G3 is handled.

The cut by the line "G1 X8.9 Y3.25" is not tangent to the arc in the line "=
G3 X8.15 Y2.5 R.75" so EMC may be complaining about not being able to clean =
up the corner.

When you program a R-.75 you are telling it that the radius is greater then=
180° which would result in a sharp corner going into the radius which makes=
me think it is complaining about not cleaning up the corner when R.75 is us=
ed.

Good luck,
Andre'

--- 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.