Cent 4 cant deal with cutter comp and multiple g02?

[Brian FRF]

Got a clover leaf looking part. If I eliminate cutter comp from the program, it runs fine. Put it back in, controller enters in all kinds of "(>) x3.4562 y 3.4585" between my program lines? Other number, but random coordinates shoved in there? Running around the outside of the contour, going clockwise, using g41. Even put in a g42 to see what it would do. Totally freaked out, which isnt surprising with .187R in the program, and cutter with .25 R. Im stumped on what this loony machine is doing?

[Farmers Machine]

Is the .187 R in your program an inside arc or an outside arc?
a .25R end mill will not go into a .187 inside turn and the control will not violate geometry. try a 1/4" endmill and see what happens.
Good Luck
The Farmer

[Brian FRF]

Originally Posted by Farmers Machine Is the .187 R in your program an inside arc or an outside arc? a .25R end mill will not go into a .187 inside turn and the control will not violate geometry. try a 1/4" endmill and see what happens. Good Luck The Farmer

The .187 radius is one Im going around the outside of. Got the part done, just dumb. Ended up doing the inside radius, then the little corner radius, then straight line out from the part, and back, then the next small .187 radius. Then just rand a circle around the whole part. Dumb, and shouldnt have to do it that way, but worked.

[Brian FRF]

Another part, same issue, same thing. Cutter comp turned on, and is stick in 3 lines in different places with "(>)" at the beginning of the line. Turn comp off, and it even takes those things out on its own! Again outside profile, real easy one, looks like a banana with radiused corners. Am I doing something wrong? I just dont understand how it work without comp, and then comp makes all kinds of weird stuff happen?

[Brian L]

Not near enough info... post the code, post a print.... can't help without some specifics.

[Brian FRF]

Originally Posted by Brian L Not near enough info... post the code, post a print.... can't help without some specifics.

duh... of all the stupid things. Got all the dimensions to 4 decimal points, and it runs fine. Still wierd that it runs without comp. Must be something with the small error getting magnified, still weird, but figured it out!

[Golfer79]

If you are not exact on your numbers cutter comp will not work right. If you take cutter comp out your radius will be different than what you program unless you figure the numbers yourself to compensate. I think it is in your tool geometry or tip that is messing up your program. As long as you have a smaller radius on the tool than you are trying to make.

[Brian L]

When you use cutter comp, you have to have start and stop moves that aren't cutting material, air cuts, initial offset moves, whatever you want to call them. they have to be at least twice the diameter of offset and not at an acute angle so as to trap the end mill.

As Golfer said, the radius programmed has to be larger than the radius input into the D value for the tool, you can't have a .187R in the program and use a .250R tool.

There are parameters that can be set for how close your math has to be... but in my experience, you need to be accurate to 4 places, especially if you are using cutter comp because it complicates the math calculations the control has to do to come up with a cutter path.