Newbie- Hi all, Tool diameter offset question.

[chad123]

Hi, I have been teaching myself how to use a friends VF3 and have some questions about tool diameter offsets.

I was doing a test piece for a bearing seat. I am using the tool probe to set the length and diameter and this seems to be working because things are turning out exactly as designed. Now my question is how can I fudge the tool offset by .0005 to give me a little room for the bearing.

I have tried to add and subtract up to .004 from the diameter of the measured value with no difference in the cut. I have also tried the same with the wear and still can't get it to fine tune my hole.

Now I understand that I should just program it a little bigger but some times it is not as easy as just bumping the tool diameter a smige and re running the hole for a smooth fit.

Any suggestions?

thanks,

Chad

[dcoupar]

If you put a G41 Dnn or G42 Dnn in your program, the subsequent moves will be compensated left or right by the value stored in Dnn. Since I don't know what your program looks like... imagine milling a 2.000 circle centered at X0, Y0 with a 1.000 diameter end mill, and D01 set to 0.000.

Measure the bore after the 1st run. If it's undersize, put a - (minus) comp value in D01.

%
O0100 (INTERPOLATE 2.0 DIA W/ 1.0 EM)
N005 T01 M06
N010 G00 G54 X0 Y0 S2500 M03
N015 G43 Z0.1 H01
N020 G01 Z-0.5 F20.0 M08
N025 G41 X0.5 D01 F5.0
N030 G03 I-0.5
N035 G01 G40 X0
N040 G00 Z0.1 M09
N045 G53 Y0 Z0
N050 M30
%

[chad123]

Ok, that helps. I will play with that.

Thanks.

Chad