need help thread milling

[brianp-jag]

hello peoples, im new here. not sure if im in the right spot. im having trouble with threadmilling. im fairly new to the programing side of this stuff. im using the advent thread milling software and an advent threadmill. for some reason it keeps cutting my 5/8-18 thread off center of my hole. ive used it before to cut some npt threads with no problems. but trying to cut the straight un thread is giving me hell. no matter what i do or change it cuts off center everytime. i dont understand what the problem is can anyone please help completly lost. brian

[Geof]

You need to post the code so people can see what it is, also where your work zero is located.

I program my own code for straight thread milling and normally put the work zero at the center of the hole. Then the I in the G02/3 is the same as the G01 X move that puts the cutter at the thread radius, or J the same as X. You just have to remember they are opposite signs.

[brianp-jag]

the work zero is the center of the hole. everything runs of that work zero. i drill the hole then endmill it out to size. the threadmill comes in the same work zero then cuts the threads way off center. give me a few and i will post the code. i use gibbscam for all my programing and advent for the threadmill. simply cuz i cant figure out how to do it in gibbs. im very new to this software and have never programmed before 4 or 5 months ago. ive been running machines for over 10 years and recently took over a shop. i have no help here and have to learn it all on my own. thus far ive been moderatly succesful until the threadmill has come into play. thanks for the help thus far. program will folow soon.

[brianp-jag]

here is my complete program. its for a hurco ultimax. everything is good and proven except the thread mill.


/ PROGRAM: 100970-5 FIX.NCF
/ .625-11 THREAD AND RELIEF
/ FORMAT: HURCO ULTIMAX BMC40
/ 10/10/11 AT 10:04 AM BP
/ OUTPUT IN ABSOLUTE INCHES
/ PARTS PROGRAMMED: 1
/ FIRST TOOL NOT IN SPINDLE
/ OPERATION 1: HOLES
/ WORKGROUP
/ TOOL 1: .0781 CENTER DRILL
/ #2 CENTER DRILL
/ CS#1 - XY PLANE
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/ OPERATION 2: HOLES
/ WORKGROUP
/ TOOL 1: .0781 CENTER DRILL
/ #2 CENTER DRILL
/ CS#1 - XY PLANE
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/ OPERATION 3: HOLES
/ WORKGROUP
/ TOOL 1: .0781 CENTER DRILL
/ #2 CENTER DRILL
/ CS#1 - XY PLANE
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/ OPERATION 4: HOLES
/ WORKGROUP
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/ 3/32 .093 DRILL
/ CS#1 - XY PLANE
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/ OPERATION 5: HOLES
/ WORKGROUP
/ TOOL 2: .093 DRILL
/ 3/32 .093 DRILL
/ CS#1 - XY PLANE
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/ OPERATION 6: HOLES
/ WORKGROUP
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/ 7/16 DRILL
/ CS#1 - XY PLANE
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/ OPERATION 7: HOLES
/ WORKGROUP
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/ .125 DRILL
/ CS#1 - XY PLANE
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/ OPERATION 8: CONTOUR
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/ TOOL 5: .5 ROUGH ENDMILL
/ .5 ROUGH ENDMILL
/ CS#1 - XY PLANE
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/ OPERATION 9: CONTOUR
/ WORKGROUP
/ TOOL 6: .375 ROUGH ENDMILL
/ .375 END MILL FINISH BOTTOM
/ CS#1 - XY PLANE
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N447 G0 Z-0.2863
N448 G1 X0.0006 Y-0.0049
N449 G41 D28 X0.0031 Y-0.0247 F4.9
N450 G3 X0.0560 Y0.0000 Z-0.2700 I0.0207 J0.0247 F0.6
N451 Z-0.2144 I-0.0560 J-0.0000 F0.9
N452 X0.0031 Y0.0247 Z-0.1982 I-0.0322 J-0.0000 F0.6
N453 G1 G40 X0.0000 Y0.0000 F40.0
N454 G0 Z-0.2871
N455 G1 X0.0003 Y-0.0049
N456 G41 D28 X0.0015 Y-0.0249 F4.9
N457 G3 X0.0620 Y0.0000 Z-0.2700 I0.0251 J0.0249 F0.6
N458 Z-0.2144 I-0.0620 J-0.0000 F1.0
N459 X0.0015 Y0.0249 Z-0.1974 I-0.0354 J-0.0000 F0.6
N460 G1 G40 X0.0000 Y0.0000 F40.0
N461 G0 Z-0.2874
N462 G1 X0.0001 Y-0.0049
N463 G41 D28 X0.0007 Y-0.0249 F4.9
N464 G3 X0.0650 Y0.0000 Z-0.2700 I0.0273 J0.0249 F0.6
N465 Z-0.2144 I-0.0650 J-0.0000 F1.0
N466 X0.0007 Y0.0249 Z-0.1970 I-0.0370 J-0.0000 F0.6
N467 G1 G40 X0.0000 Y0.0000 F40.0
N468 G0 Z0.0100 M5
N469M9
N470M25
N471G90G0M5
N472M2
E

[ProProcess]

One thing that looks confusing to me is that you are programming a 5/8-18, you are using radius comp, yet your programmed radius is only .065 seen here...

N465 Z-0.2144 I-0.0650 J-0.0000 F1.0

If you have a radius value in your offset, but the program is not really expecting one, this can make the results counter-intuative i.e. they look all screwed up.

Look into that and post back here

[brianp-jag]

ok im sorry but im not really understanding what ur saying. it spits out radious comp. on the software automaticaly. do i need to take out the radius comp. cuz i have done this and it doesnt change anything. ive been fighting this for about 2 weeks now.very frustrated. like i said ive never programmed before about 4 months ago. so all this is very new to me and confusing. i used the advent software with the advent thread mill to program that part of it.

[ProProcess]

N463 G41 D28 X0.0007 Y-0.0249 F4.9

If D28 is offset 28, then make sure that there is no radius value in that offset and run one like that, i.e. do not change the program, just make the radius value 0.

Let us know what that does

[brianp-jag]

the value is 0 in the offset. no offset has been put in it

[txcncman]

Take a look at the GibbsCAM file and the G-code file in the attached ZIP file.

[txcncman]

Some of the thread milling routines do not use the center of the circle as the center of the arc for cutting. This may be why you think it is cutting off center is because in a way it is.

Here is some info that might help: http://www.vardexusa.com/vardex-pdf/Hand_Book__mm.pdf

[brianp-jag]

ok i looked at it tho it doesnt offer much help cuz the g-code is for a fanuc where i have a hurco ultimax. i see the concept tho and will try it i gibbs. the hurco post and the fanuc post are 2 completly different posts thanks for the help i will see what i can come up with.

[brianp-jag]

ok so if its doing that then how do u correct that and make it cut on the center of the hole like its supposed to?