Help G41 doesn't work for multiple offsets!

[BehemothDT]

Hi. Mach3 on Mill.
I have many parts which have 2 operations. I have 2 fixtures mounted to my table. Im using G54 for one fixture, and G56 for the other in the same program. Mach3 will machine everything perfectly, until it gets to the precision bore sizes and I use G41 cutter compensation. Then it will go nuts.
If I have G54 as active offset when I load the program, it will generate perfect toolpath for G54, and crazy scribble for the G56 portion using G41. If I select G56 as active work offset when I load the program it will generate crazy scribble for the G54 portion using G41. If G55 or any other is active work offset both toolpaths have crazy scribble for the G41 portion. I'm certain Mach is using the currently selected active work offset for toolpath generation, instead of programmed work offset.

I also tried using only G54, and writing in my other fixture with G52 offset. This gives me the same errors. The code is perfect until G41 is involved.

Is there a fix for this?
Does Mach4 correct this?

Thanks

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[metalmayhem]

hard for anyone to help resolve the problem without at least seeing the code . These things usually boil down to programming errors or oversights

[BehemothDT]

hard for anyone to help resolve the problem without at least seeing the code . These things usually boil down to programming errors or oversights

Not to sound arrogant, but this is not a code error, rather a Mach3 bug with cutter compensation G41/G42, when using any offset other than the currently selected active work offset.
I can literally make the problem go away by simply selecting the right work offset. My problem is from having 2 work offsets in 1 program + using G41. This particular program is about 5K lines long. Ill make a simpler example and post it up today.

Thanks

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[mactec54]

Not to sound arrogant, but this is not a code error, rather a Mach3 bug with cutter compensation G41/G42, when using any offset other than the currently selected active work offset.
I can literally make the problem go away by simply selecting the right work offset. My problem is from having 2 work offsets in 1 program + using G41. This particular program is about 5K lines long. Ill make a simpler example and post it up today.

Thanks

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Post your code or how you have inserted the cutter comp

G41 has nothing to do with work offsets, G41 /G42 is only used for cutter compensation and has to do a line feed move before it will activate, you also have to cancel it after the operation G40 has finished and then use it again in the next work offset after a feed move G41

Do you adjust with cutter comp for tool wear ??

what is your purpose for using G41 cutter comp ??

I must say though Mach3 with cutter comp was never very reliable

[BehemothDT]

Im working on posting the code and a couple pictures of the simulation display.

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[ger21]

I believe th as t this is a known issue with Mach3.

Mach4 is completely new, so it should not have this issue.

[BehemothDT]

Terrible pictures of the display, sorry.
First picture I select G54 as active work offset. Second picture I select G56 as active work offset.

If someone can confirm that Mach4 takes care of this, I will be upgrading to Mach4. This will streamline my production. cutter comp test 2.txt

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[BehemothDT]

Do you adjust with cutter comp for tool wear ??

what is your purpose for using G41 cutter comp ??

I must say though Mach3 with cutter comp was never very reliable

I'm using G41 so that my bore sizes come out right, no matter if tool is slighlty over or under size. Works like a charm everywhere except Mach3 with multiple offsets.

I have begun to find many threads on this issue with Mach3 and cutter compensation.

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[Mecanix]

Works flawlessly within MACH3 Version R3.043.062. I'd try this version before going the Mach4 route.

Screen grab of > Configs > General Settings/ See if you can replicate

[BehemothDT]

Mine does that if I have the tool table loaded with tool #120 as Dia. Of 0.0000".
Did you run this after telling it the diameter of tool is 1.2500"?

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[BehemothDT]

My config settings are same as yours.

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[Mecanix]

Hang on, I'll restart this for you with tool #120 w/ both dia 0.00 and 1.25".

edit: oh, I see :/

ps: check this link out, and I wouldn't bother with mach4 (https://www.cnczone.com/forums/gener...0-cnc-cam.html)

[BehemothDT]

It may be my 2015 version of mach3

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[BehemothDT]

Hang on, I'll restart this for you with tool #120 w/ both dia 0.00 and 1.25".

edit: oh, I see :/

ps: check this link out, and I wouldn't bother with mach4 (https://www.cnczone.com/forums/gener...0-cnc-cam.html)

I looked at your link, but I dont even know what its talking about. Is this a new controller software?


I really need something similar to Mach3, as I need to be making parts instead of learning something totally new.

Im hoping my hardware is compatible with Mach4 or something similar.

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[Mecanix]

My end came out of R3.043.062... so you can rule this one out.

Im hoping my hardware is compatible with Mach4 or something similar.

Most likely not, who knows and I certainly wouldn't 'pay just to find out'. I was serious about that link up... lookup "Rosetta Control" and the work that went into this control & sim package. Just need to change the bob really. Ridiculously affordable in comparison with some industrial controls having similar functions. Game changer imho... certainly makes Mach4 look even more amateur'ish lol

Tried to help. You are on your own! G'luck

[Mecanix]

Quick'er & cheaper solution for you is to get rid of your c.comp and re-write the code. Possibly make another fixture for those two parts also.

[BehemothDT]

My end came out of R3.043.062... so you can rule this one out.



Most likely not, who knows and I certainly wouldn't 'pay just to find out'. I was serious about that link up... lookup "Rosetta Control" and the work that went into this control & sim package. Just need to change the bob really. Ridiculously affordable in comparison with some industrial controls having similar functions. Game changer imho... certainly makes Mach4 look even more amateur'ish lol

Tried to help. You are on your own! G'luck

Ill check out that control when i get home on my PC.

I have multiple parts with multiple fixtures. I need to be able to mix and match.
Thanks for your help. The machsupport.com forum is a ghost town.


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[shineworld]

That's what I've got loading your "cutter comp test 2.txt" in mine CNC
placing G54 to X0Y0Z0 and G56 to X10Y0Z0



Gcode program seem correct at view level

[BehemothDT]

Shineworld, do you have the tool diameter loaded in tool table for tool 120?

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[ger21]

It may be my 2015 version of mach3

The last version of Mach3 was probably from 2013, maybe even older.
As I said, this is a known bug (one of many) with Mach3. All versions.

I'm not sure of the status of Mach4's cutter comp. You'll need to download the demo and test it.