Cutter Comp Problem

[mgb1974]

I am writing a grinding dress program for our 3 axis grinder.

My problem is that Cutter comp is throwing up problems. Is it possible to not use cutter comp in y?

Here is the program:

N9 G40 G17 G129
N13 M52 (TURN DRESSER ON)
N21 G43 H15 G00 Z-[#195+.125] M08 (MOVE INTO POSITION Z)
N25 G00 G90 X-8.5 Y2.0 S3000 F0.50 M03 (MOVE INTO POSITION X Y)
N27 G41 X-8.25 Y-[#2415/2] D15

N33 #110= 0.002 (DRESS DEPTH PER DRESS CYCLE)
N37 #109= 10 (NUMBER OF DRESS PASSES)
N41 #111= 2.75(DIAMETER OF DRESSER DIAMOND WHEEL)
N45 #112=#111/2
(10 X .002=.020 TOTAL DRESS OF WHEEL EACH DRESS CYCLE)
N49 #195=.500 (WHEEL THICKNESS)

N53 WH [ #109 GE 0 ] DO1 (dress 10 times)
N55 G41 G00 X-6.5 D15 (approach)
N57 G01 X[#111+[#2415/2]] (move in x to dress,)
N59 G04 P10 (dwell)
N65 #2415=#2415-#110 (writes tool #15 to tool dia offset, since dia changes after each dress)

N81 #109= #109 - 1
N85 END1

After it goes through one loop, y automatically moves but I need it to stay in the Y0 instead it offsets in Y the cutter comp(half the wheel dia).

Basically I need a straight move in X,with cutter comp) Y does not move after approach. Then a retract in X then move back in X.

If this makes sense is there anything I am doing wrong or a way to fix my problem??

thanks

[beege]

What control are you working with?
Have you looked into G45-G48?

On some controllers,

G45 = Single increase (increases movement by offset amount)
G46 = Single decrease
G47 = double increase
G48 = double decrease

Fairly non-used G codes, but may be helpful here

[mgb1974]

looked through the manual on the control and it does not use those G-Codes.

Any other ideas??

[beege]

So what control are you using?

[mgb1974]

sorry its a HAAS control. Retrofit deal.

[Andre' B]

Just a quick look at your code brings to question lines like this one.
N27 G41 X-8.25 Y-[#2415/2] D15
Where you are turning on cutter comp and using the tool data directly from the tool table. Maybe I am not visuallizing your setup properly but I would think you would want to do one or the other but not both.

Were it me I would not use G41/42 comp in the dressing code, just include the $24xx values into the movements.

The next thing that jumps out is in the while loop you using the #24xx number to do the dress but are not incrementing it until after the dress is complete, meaning the #24xx number represents how big the tool will be after the next dress and not the current size of the wheel.

[Torsten]

Originally Posted by mgb1974 I am writing a grinding dress program for our 3 axis grinder. My problem is that Cutter comp is throwing up problems. Is it possible to not use cutter comp in y? Here is the program: N9 G40 G17 G129 N13 M52 (TURN DRESSER ON) N21 G43 H15 G00 Z-[#195+.125] M08 (MOVE INTO POSITION Z) N25 G00 G90 X-8.5 Y2.0 S3000 F0.50 M03 (MOVE INTO POSITION X Y) N27 G41 X-8.25 Y-[#2415/2] D15 N33 #110= 0.002 (DRESS DEPTH PER DRESS CYCLE) N37 #109= 10 (NUMBER OF DRESS PASSES) N41 #111= 2.75(DIAMETER OF DRESSER DIAMOND WHEEL) N45 #112=#111/2 (10 X .002=.020 TOTAL DRESS OF WHEEL EACH DRESS CYCLE) N49 #195=.500 (WHEEL THICKNESS) N53 WH [ #109 GE 0 ] DO1 (dress 10 times) N55 G41 G00 X-6.5 D15 (approach) N57 G01 X[#111+[#2415/2]] (move in x to dress,) N59 G04 P10 (dwell) N65 #2415=#2415-#110 (writes tool #15 to tool dia offset, since dia changes after each dress) N81 #109= #109 - 1 N85 END1 After it goes through one loop, y automatically moves but I need it to stay in the Y0 instead it offsets in Y the cutter comp(half the wheel dia). Basically I need a straight move in X,with cutter comp) Y does not move after approach. Then a retract in X then move back in X. If this makes sense is there anything I am doing wrong or a way to fix my problem?? thanks

Just guessing here, not famililiar with some of the codes you use.
Try moving line N27 past N49 and get rid of the G41 in line N55.
I think cutter comp can get confused if there are several non moving lines
inbetween.
Good Luck