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

Similar Threads:

• Thread Milling, Can you do this ?
• Newbie- V23 thread milling
• 3M and thread milling?
• thread milling
• Thread milling

[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
N19G0G17G70G90S500T1M6
N20G75M3
N21X0.Y0.Z1.
N22Z.1 M8
N23G83X0.Y0.Z.18Z.0179F.5
N24G80
N25G0Z.1
/ OPERATION 2: HOLES
/ WORKGROUP
/ TOOL 1: .0781 CENTER DRILL
/ #2 CENTER DRILL
/ CS#1 - XY PLANE
N26G90G0X0.Y-.402
N27Z.1
N28G83X0.Y-.402Z.18Z.0179F.5
N29G80
N30G0Z.1
/ OPERATION 3: HOLES
/ WORKGROUP
/ TOOL 1: .0781 CENTER DRILL
/ #2 CENTER DRILL
/ CS#1 - XY PLANE
N31G90G0X.402Y0.
N32Z.1
N33G83X.402Y0.Z.18Z.0179F.5
N34G80
N35G0Z.1
N36M9
N37M25
N38G0
N39M0
N40T2M6
/ OPERATION 4: HOLES
/ WORKGROUP
/ TOOL 2: .093 DRILL
/ 3/32 .093 DRILL
/ CS#1 - XY PLANE
N41S1848M3
N42G90G0X0.Y-.402
N43Z1.
N44Z.1 M8
N45G83X0.Y-.402Z.35Z.0213F1.9
N46G80
N47G0Z.1
/ OPERATION 5: HOLES
/ WORKGROUP
/ TOOL 2: .093 DRILL
/ 3/32 .093 DRILL
/ CS#1 - XY PLANE
N48G90G0X.402Y0.
N49Z.1
N50G83X.402Y0.Z.35Z.0213F1.9
N51G80
N52G0Z.1
N53M9
N54M25
N55G0
N56M0
N57T3M6
/ OPERATION 6: HOLES
/ WORKGROUP
/ TOOL 3: .4375 DRILL
/ 7/16 DRILL
/ CS#1 - XY PLANE
N58S480M3
N59G90G0X0.Y0.
N60Z1.
N61Z.1 M8
N62G83X0.Y0.Z.615Z.1F1.
N63G80
N64G0Z.1
N65M9
N66M25
N67G0
N68M0
N69T4M6
/ OPERATION 7: HOLES
/ WORKGROUP
/ TOOL 4: .125 DRILL
/ .125 DRILL
/ CS#1 - XY PLANE
N70S1375M3
N71G90G0X0.Y0.
N72Z1.
N73Z.1 M8
N74G83X0.Y0.Z.99Z.0286F1.4
N75G80
N76G0Z.1
N77M9
N78M25
N79G0
N80M0
N81T5M6
/ OPERATION 8: CONTOUR
/ WORKGROUP
/ TOOL 5: .5 ROUGH ENDMILL
/ .5 ROUGH ENDMILL
/ CS#1 - XY PLANE
N82S1528M3
N83G90G0X.0092Y.0042
N84Z1.
N85Z.1 M8
N86G1Z-.045F.5
N87G41X.0037Y.0126
N88G3G17X-.0047Y.0171I-.0047J.0071
N89G17X-.0101Y.0155I-.0047J.0071
N90G17X-.0185Y0.I0.J0.F6.1
N91G17X0.Y-.0185I0.J0.
N92G17X.0185Y0.I0.J0.
N93G17X0.Y.0185I0.J0.
N94G17X-.0101Y.0155I0.J0.
N95G17X-.0185Y0.I0.J0.
N96G17X0.Y-.0185I0.J0.
N97G17X.0185Y0.I0.J0.
N98G17X0.Y.0185I0.J0.
N99G17X-.0101Y.0155I0.J0.
N100G17X-.0147Y.0071I-.0047J.0071
N101G17X-.013Y.0016I-.0047J.0071
N102G40G1X-.0075Y-.0067
N103G0Z.1
N104X.0092Y.0042
N105Z-.045
N106G1Z-.09F.5
N107G41X.0037Y.0126
N108G3G17X-.0047Y.0171I-.0047J.0071
N109G17X-.0101Y.0155I-.0047J.0071
N110G17X-.0185Y0.I0.J0.F6.1
N111G17X0.Y-.0185I0.J0.
N112G17X.0185Y0.I0.J0.
N113G17X0.Y.0185I0.J0.
N114G17X-.0101Y.0155I0.J0.
N115G17X-.0185Y0.I0.J0.
N116G17X0.Y-.0185I0.J0.
N117G17X.0185Y0.I0.J0.
N118G17X0.Y.0185I0.J0.
N119G17X-.0101Y.0155I0.J0.
N120G17X-.0147Y.0071I-.0047J.0071
N121G17X-.013Y.0016I-.0047J.0071
N122G40G1X-.0075Y-.0067
N123G0Z.1
N124X.0092Y.0042
N125Z-.09
N126G1Z-.135F.5
N127G41X.0037Y.0126
N128G3G17X-.0047Y.0171I-.0047J.0071
N129G17X-.0101Y.0155I-.0047J.0071
N130G17X-.0185Y0.I0.J0.F6.1
N131G17X0.Y-.0185I0.J0.
N132G17X.0185Y0.I0.J0.
N133G17X0.Y.0185I0.J0.
N134G17X-.0101Y.0155I0.J0.
N135G17X-.0185Y0.I0.J0.
N136G17X0.Y-.0185I0.J0.
N137G17X.0185Y0.I0.J0.
N138G17X0.Y.0185I0.J0.
N139G17X-.0101Y.0155I0.J0.
N140G17X-.0147Y.0071I-.0047J.0071
N141G17X-.013Y.0016I-.0047J.0071
N142G40G1X-.0075Y-.0067
N143G0Z.1
N144X.0092Y.0042
N145Z-.135
N146G1Z-.18F.5
N147G41X.0037Y.0126
N148G3G17X-.0047Y.0171I-.0047J.0071
N149G17X-.0101Y.0155I-.0047J.0071
N150G17X-.0185Y0.I0.J0.F6.1
N151G17X0.Y-.0185I0.J0.
N152G17X.0185Y0.I0.J0.
N153G17X0.Y.0185I0.J0.
N154G17X-.0101Y.0155I0.J0.
N155G17X-.0185Y0.I0.J0.
N156G17X0.Y-.0185I0.J0.
N157G17X.0185Y0.I0.J0.
N158G17X0.Y.0185I0.J0.
N159G17X-.0101Y.0155I0.J0.
N160G17X-.0147Y.0071I-.0047J.0071
N161G17X-.013Y.0016I-.0047J.0071
N162G40G1X-.0075Y-.0067
N163G0Z.1
N164X.0092Y.0042
N165Z-.18
N166G1Z-.225F.5
N167G41X.0037Y.0126
N168G3G17X-.0047Y.0171I-.0047J.0071
N169G17X-.0101Y.0155I-.0047J.0071
N170G17X-.0185Y0.I0.J0.F6.1
N171G17X0.Y-.0185I0.J0.
N172G17X.0185Y0.I0.J0.
N173G17X0.Y.0185I0.J0.
N174G17X-.0101Y.0155I0.J0.
N175G17X-.0185Y0.I0.J0.
N176G17X0.Y-.0185I0.J0.
N177G17X.0185Y0.I0.J0.
N178G17X0.Y.0185I0.J0.
N179G17X-.0101Y.0155I0.J0.
N180G17X-.0147Y.0071I-.0047J.0071
N181G17X-.013Y.0016I-.0047J.0071
N182G40G1X-.0075Y-.0067
N183G0Z.1
N184X.0092Y.0042
N185Z-.225
N186G1Z-.27F.5
N187G41X.0037Y.0126
N188G3G17X-.0047Y.0171I-.0047J.0071
N189G17X-.0101Y.0155I-.0047J.0071
N190G17X-.0185Y0.I0.J0.F6.1
N191G17X0.Y-.0185I0.J0.
N192G17X.0185Y0.I0.J0.
N193G17X0.Y.0185I0.J0.
N194G17X-.0101Y.0155I0.J0.
N195G17X-.0185Y0.I0.J0.
N196G17X0.Y-.0185I0.J0.
N197G17X.0185Y0.I0.J0.
N198G17X0.Y.0185I0.J0.
N199G17X-.0101Y.0155I0.J0.
N200G17X-.0147Y.0071I-.0047J.0071
N201G17X-.013Y.0016I-.0047J.0071
N202G40G1X-.0075Y-.0067
N203G0Z.1
N204M9
N205M25
N206G0
N207M0
N208T6M6
/ OPERATION 9: CONTOUR
/ WORKGROUP
/ TOOL 6: .375 ROUGH ENDMILL
/ .375 END MILL FINISH BOTTOM
/ CS#1 - XY PLANE
N209S2037M3
N210G90G0X-.0016Y-.034
N211Z1.
N212Z.1 M8
GO -.25
N213G1Z-.274F.5
N214G41X.0009Y-.0437
N215G3G17X.0106Y-.0512I.0106J-.0412
N216G17X.0131Y-.0508I.0106J-.0412
N217G17X.0525Y0.I0.J0.F8.2
N218G17X0.Y.0525I0.J0.
N219G17X-.0525Y0.I0.J0.
N220G17X0.Y-.0525I0.J0.
N221G17X.0131Y-.0508I0.J0.
N222G17X.0525Y0.I0.J0.
N223G17X0.Y.0525I0.J0.
N224G17X-.0525Y0.I0.J0.
N225G17X0.Y-.0525I0.J0.
N226G17X.0131Y-.0508I0.J0.
N227G17X.0206Y-.0412I.0106J-.0412
N228G17X.0203Y-.0387I.0106J-.0412
N229G40G1X.0178Y-.029
N230G0Z.1
N231X-.0016Y-.034
N232Z-.275
N233G1Z-.298F.5
N234G41X.0009Y-.0437
N235G3G17X.0106Y-.0512I.0106J-.0412
N236G17X.0131Y-.0508I.0106J-.0412
N237G17X.0525Y0.I0.J0.F8.2
N238G17X0.Y.0525I0.J0.
N239G17X-.0525Y0.I0.J0.
N240G17X0.Y-.0525I0.J0.
N241G17X.0131Y-.0508I0.J0.
N242G17X.0525Y0.I0.J0.
N243G17X0.Y.0525I0.J0.
N244G17X-.0525Y0.I0.J0.
N245G17X0.Y-.0525I0.J0.
N246G17X.0131Y-.0508I0.J0.
N247G17X.0206Y-.0412I.0106J-.0412
N248G17X.0203Y-.0387I.0106J-.0412
N249G40G1X.0178Y-.029
N250G0Z.1
N251X-.0016Y-.034
N252Z-.290
N253G1Z-.322F.5
N254G41X.0009Y-.0437
N255G3G17X.0106Y-.0512I.0106J-.0412
N256G17X.0131Y-.0508I.0106J-.0412
N257G17X.0525Y0.I0.J0.F8.2
N258G17X0.Y.0525I0.J0.
N259G17X-.0525Y0.I0.J0.
N260G17X0.Y-.0525I0.J0.
N261G17X.0131Y-.0508I0.J0.
N262G17X.0525Y0.I0.J0.
N263G17X0.Y.0525I0.J0.
N264G17X-.0525Y0.I0.J0.
N265G17X0.Y-.0525I0.J0.
N266G17X.0131Y-.0508I0.J0.
N267G17X.0206Y-.0412I.0106J-.0412
N268G17X.0203Y-.0387I.0106J-.0412
N269G40G1X.0178Y-.029
N270G0Z.1
N271X-.0016Y-.034
N272Z-.32
N273G1Z-.346F.5
N274G41X.0009Y-.0437
N275G3G17X.0106Y-.0512I.0106J-.0412
N276G17X.0131Y-.0508I.0106J-.0412
N277G17X.0525Y0.I0.J0.F8.2
N278G17X0.Y.0525I0.J0.
N279G17X-.0525Y0.I0.J0.
N280G17X0.Y-.0525I0.J0.
N281G17X.0131Y-.0508I0.J0.
N282G17X.0525Y0.I0.J0.
N283G17X0.Y.0525I0.J0.
N284G17X-.0525Y0.I0.J0.
N285G17X0.Y-.0525I0.J0.
N286G17X.0131Y-.0508I0.J0.
N287G17X.0206Y-.0412I.0106J-.0412
N288G17X.0203Y-.0387I.0106J-.0412
N289G40G1X.0178Y-.029
N290G0Z.1
N291X-.0016Y-.034
N292Z-.340
N293G1Z-.37F.5
N294G41X.0009Y-.0437
N295G3G17X.0106Y-.0512I.0106J-.0412
N296G17X.0131Y-.0508I.0106J-.0412
N297G17X.0525Y0.I0.J0.F8.2
N298G17X0.Y.0525I0.J0.
N299G17X-.0525Y0.I0.J0.
N300G17X0.Y-.0525I0.J0.
N301G17X.0131Y-.0508I0.J0.
N302G17X.0525Y0.I0.J0.
N303G17X0.Y.0525I0.J0.
N304G17X-.0525Y0.I0.J0.
N305G17X0.Y-.0525I0.J0.
N306G17X.0131Y-.0508I0.J0.
N307G17X.0206Y-.0412I.0106J-.0412
N308G17X.0203Y-.0387I.0106J-.0412
N309G40G1X.0178Y-.029
N310G0Z.1
N311X-.0016Y-.034
N312Z-.36
N313G1Z-.394F.5
N314G41X.0009Y-.0437
N315G3G17X.0106Y-.0512I.0106J-.0412
N316G17X.0131Y-.0508I.0106J-.0412
N317G17X.0525Y0.I0.J0.F8.2
N318G17X0.Y.0525I0.J0.
N319G17X-.0525Y0.I0.J0.
N320G17X0.Y-.0525I0.J0.
N321G17X.0131Y-.0508I0.J0.
N322G17X.0525Y0.I0.J0.
N323G17X0.Y.0525I0.J0.
N324G17X-.0525Y0.I0.J0.
N325G17X0.Y-.0525I0.J0.
N326G17X.0131Y-.0508I0.J0.
N327G17X.0206Y-.0412I.0106J-.0412
N328G17X.0203Y-.0387I.0106J-.0412
N329G40G1X.0178Y-.029
N330G0Z.1
N331X-.0016Y-.034
N332Z-.39
N333G1Z-.418F.5
N334G41X.0009Y-.0437
N335G3G17X.0106Y-.0512I.0106J-.0412
N336G17X.0131Y-.0508I.0106J-.0412
N337G17X.0525Y0.I0.J0.F8.2
N338G17X0.Y.0525I0.J0.
N339G17X-.0525Y0.I0.J0.
N340G17X0.Y-.0525I0.J0.
N341G17X.0131Y-.0508I0.J0.
N342G17X.0525Y0.I0.J0.
N343G17X0.Y.0525I0.J0.
N344G17X-.0525Y0.I0.J0.
N345G17X0.Y-.0525I0.J0.
N346G17X.0131Y-.0508I0.J0.
N347G17X.0206Y-.0412I.0106J-.0412
N348G17X.0203Y-.0387I.0106J-.0412
N349G40G1X.0178Y-.029
N350G0Z.1
N351X-.0016Y-.034
N352Z-.41
N353G1Z-.442F.5
N354G41X.0009Y-.0437
N355G3G17X.0106Y-.0512I.0106J-.0412
N356G17X.0131Y-.0508I.0106J-.0412
N357G17X.0525Y0.I0.J0.F8.2
N358G17X0.Y.0525I0.J0.
N359G17X-.0525Y0.I0.J0.
N360G17X0.Y-.0525I0.J0.
N361G17X.0131Y-.0508I0.J0.
N362G17X.0525Y0.I0.J0.
N363G17X0.Y.0525I0.J0.
N364G17X-.0525Y0.I0.J0.
N365G17X0.Y-.0525I0.J0.
N366G17X.0131Y-.0508I0.J0.
N367G17X.0206Y-.0412I.0106J-.0412
N368G17X.0203Y-.0387I.0106J-.0412
N369G40G1X.0178Y-.029
N370G0Z.1
N371X-.0016Y-.034
N372Z-..435
N373G1Z-.466F.5
N374G41X.0009Y-.0437
N375G3G17X.0106Y-.0512I.0106J-.0412
N376G17X.0131Y-.0508I.0106J-.0412
N377G17X.0525Y0.I0.J0.F8.2
N378G17X0.Y.0525I0.J0.
N379G17X-.0525Y0.I0.J0.
N380G17X0.Y-.0525I0.J0.
N381G17X.0131Y-.0508I0.J0.
N382G17X.0525Y0.I0.J0.
N383G17X0.Y.0525I0.J0.
N384G17X-.0525Y0.I0.J0.
N385G17X0.Y-.0525I0.J0.
N386G17X.0131Y-.0508I0.J0.
N387G17X.0206Y-.0412I.0106J-.0412
N388G17X.0203Y-.0387I.0106J-.0412
N389G40G1X.0178Y-.029
N390G0Z.1
N391X-.0016Y-.034
N392Z-.46
N393G1Z-.49F.5
N394G41X.0009Y-.0437
N395G3G17X.0106Y-.0512I.0106J-.0412
N396G17X.0131Y-.0508I.0106J-.0412
N397G17X.0525Y0.I0.J0.F8.2
N398G17X0.Y.0525I0.J0.
N399G17X-.0525Y0.I0.J0.
N400G17X0.Y-.0525I0.J0.
N401G17X.0131Y-.0508I0.J0.
N402G17X.0525Y0.I0.J0.
N403G17X0.Y.0525I0.J0.
N404G17X-.0525Y0.I0.J0.
N405G17X0.Y-.0525I0.J0.
N406G17X.0131Y-.0508I0.J0.
N407G17X.0206Y-.0412I.0106J-.0412
N408G17X.0203Y-.0387I.0106J-.0412
N409G40G1X.0178Y-.029
N410G0Z.1
N411X-.0016Y-.034
N412Z-.48
N413G1Z-.514F.5
N414G41X.0009Y-.0437
N415G3G17X.0106Y-.0512I.0106J-.0412
N416G17X.0131Y-.0508I.0106J-.0412
N417G17X.0525Y0.I0.J0.F8.2
N418G17X0.Y.0525I0.J0.
N419G17X-.0525Y0.I0.J0.
N420G17X0.Y-.0525I0.J0.
N421G17X.0131Y-.0508I0.J0.
N422G17X.0525Y0.I0.J0.
N423G17X0.Y.0525I0.J0.
N424G17X-.0525Y0.I0.J0.
N425G17X0.Y-.0525I0.J0.
N426G17X.0131Y-.0508I0.J0.
N427G17X.0206Y-.0412I.0106J-.0412
N428G17X.0203Y-.0387I.0106J-.0412
N429G40G1X.0178Y-.029
N430G0Z.1
N431M9
N432M25
N433G0
N434M0
N435T7M6
/.375 KEY CUTTER
/THREAD RELIEF
/.375X.0625WOODRUFF
N261G0G17G70G90S360
N262G75M3
N263X0.Y0.
N264Z1.
N265Z.1 M8
N266G1Z-.33F.7
N267G41X.1275
N268G3G17X0.Y.1275I0.J0.
N269G17X-.1275Y0.I0.J0.
N270G17X0.Y-.1275I0.J0.
N271G17X.1275Y0.I0.J0.
N272G40G1X0.
N273G0Z.1
N274M9
N275M25
N276M5
N277 T8M6
N278 M0
/ OPERATION 10: HOLES
/ WORKGROUP
/ ADVENT 5-8--11 THREADMILL
N436 G00 X0.0000 Y0.0000
N437 Z1.0
N438 Z.1 M8
N439 S1543 M3
N440 Z-0.2845
N441 G1 X0.0014 Y-0.0047
N442 G41 D28 X0.0072 Y-0.0238 F4.9
N443 G3 X0.0470 Y0.0000 Z-0.2700 I0.0128 J0.0238 F0.5
N444 Z-0.2144 I-0.0470 J-0.0000 F0.8
N445 X0.0072 Y0.0238 Z-0.1999 I-0.0270 J-0.0000 F0.5
N446 G1 G40 X0.0000 Y0.0000 F40.0
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?

[txcncman]

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?

I was trying to explain that even though the numbers seem that the center of cutting will be off center by 0.015 that the software adjusts the endpoint of the arc to compensate for this. I am trying to find a formula now that explains this better.

[Geof]

I copied the code for tools 7 and 8 and ran it in my simulator and I don't know how you got it to run.

Look at lines N263 to N272.

The machine moves to X0. Y0. on N263 so it is at the work zero.

Then on N267 it moves to X0.1275. (There is a G41 in this line but I don't see a D value so the G41 is not doing anything. But that will not stop the code running.)

Now on N268 a G03 move is supposed to go through an arc of 90 degrees from X0.1275 Y0. to X0. Y0.1275. But in your code both the I and J values are zero.

If the machine is at X0.1275 and the work zero is at the center of the hole the I value has to be -0.1275.

Same idea for lines N269, N270 and N271. The I has to be the opposite of the X value at the start of the arc or the J has to be the opposite of the Y value at the start of the arc.

When I edited these lines like below the code ran okay. The tool 7 the Woodruff cutter did a complete circle of four arcs around the work zero then the thread mill did four passes also around the work zero.

N267 G41 X0.1275
N268 G03 G17 X0. Y0.1275 I-0.1275 J0.
N269 G17 X-0.1275 Y0. I0. J-0.1275
N270 G17 X0. Y-0.1275 I0.1275 J0.
N271 G17 X0.1275 Y0. I0. J0.1275
N272 G40 G01 X0.

I found the code for a 7/16" drill but I didn't find the code for milling the hole out to the size for threadmilling.

[txcncman]

Here is posted for a Hurco:

%
( PROGRAM: THREAD_MILLING.NCF )
( FORMAT: HURCO ULTIMAX 3 [ID] MZ75.89.PST )
( 10/11/11 AT 9:24 AM )
( OUTPUT IN ABSOLUTE INCHES )
( PARTS PROGRAMMED: 1 )
( FIRST TOOL NOT IN SPINDLE )
( OPERATION 1: THREADING )
( WORKGROUP )
( TOOL 1: .375 THREAD MILL )
N5G0G17G70G90S3000T1M6
N10G75M3
N15G54
N20X0.Y0.Z.25M8
( CYCLE START )
N25G41X0.Y0.
N30G91
N35G1Z-.8914F5.
N40G0X.0221Y.0221
N45G1X.0042Y.0021 (<-----NOTE STARTING POINT IS OFF CENTER)
N50G3G17X.0275Y.047Z.0066I-.0263J.047
N55G17X-.0538Y.0538Z.0098I-.0538J0.
N60G17X-.125Y-.125Z.0227I0.J-.125
N65G17X.125Y-.125Z.0228I.125J0.
N70G17X.125Y.125Z.0227I0.J.125
N75G17X-.125Y.125Z.0227I-.125J0.
N80G17X-.125Y-.125Z.0227I0.J-.125
N85G17X.125Y-.125Z.0228I.125J0.
N90G17X.125Y.125Z.0227I0.J.125
N95G17X-.125Y.125Z.0227I-.125J0.
N100G17X-.125Y-.125Z.0227I0.J-.125
N105G17X.125Y-.125Z.0228I.125J0.
N110G17X.125Y.125Z.0227I0.J.125
N115G17X-.125Y.125Z.0227I-.125J0.
N120G17X-.125Y-.125Z.0228I0.J-.125
N125G17X.125Y-.125Z.0227I.125J0.
N130G17X.125Y.125Z.0227I0.J.125
N135G17X-.125Y.125Z.0227I-.125J0.
N140G17X-.125Y-.125Z.0228I0.J-.125
N145G17X.125Y-.125Z.0227I.125J0.
N150G17X.125Y.125Z.0227I0.J.125
N155G17X-.125Y.125Z.0227I-.125J0.
N160G17X-.125Y-.125Z.0228I0.J-.125
N165G17X.125Y-.125Z.0227I.125J0.
N170G17X.125Y.125Z.0227I0.J.125
N175G17X-.125Y.125Z.0228I-.125J0.
N180G17X-.125Y-.125Z.0227I0.J-.125
N185G17X.125Y-.125Z.0227I.125J0.
N190G17X.125Y.125Z.0227I0.J.125
N195G17X-.125Y.125Z.0228I-.125J0.
N200G17X-.125Y-.125Z.0227I0.J-.125
N205G17X.125Y-.125Z.0227I.125J0.
N210G17X.125Y.125Z.0227I0.J.125
N215G17X-.1054Y.1235Z.0205I-.125J0.
N220G17X-.0085Y.0006Z.001I-.0085J-.0532
N225G17X-.0538Y-.0538Z.0098I0.J-.0538
N230G17X.0205Y-.0423Z.0056I.0538J0.
N235G1X.0038Y-.0027
N240G40G0X.0184Y-.0253
N245G90Z.25
N250M9
N255M25
N260G90X0.Y0.M5
N265M2
E
( FILE LENGTH: 1815 CHARACTERS )
( FILE LENGTH: 15.41 FEET )
( FILE LENGTH: 4.77 METERS )

[txcncman]

Here is what the above code looks like in graphic.

[brianp-jag]

ok guys i greatly appreciate ur help on this tho u have me completly lost. im so in the box right now that i just dont understand it. im so sorry for this. im so confused its not even funny. tho i do appreciate ur help very very much. would it b to much to ask that someone programed the thread mill for me. the tool is .495 cutting diamiter 1" thread lenght on the tool. the threads must be .32 deep. its a hurco ultimax post. i can cut and paste from there. so sorry for the confusion. this is still very new to me. basic stuff is not a problem for me but this goes beyond what i know and im not ashamed to admit that. ive been trying on gibbs for 2 weeks now to do this and just cant figure it out.please help if anymore info is needed please contact me at 713-966-9189. much much appreciated brian at jaguar

[Geof]

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...

With CAM output this is common. The tool diameter/radius is incorporated into the code so really tool comp is not needed. But tool comp is called so that it is possible to use wear for adjusting the size. Of course for this the value in the D register has to be zero.

Regarding the comment further up by txcncman; thread milling routines do not use the center of the circle as the center of the arc for cutting.

You do have to use the center of the circle for cutting the actual. However threadmill programs do a tangential entry. That is they move slightly away from center to set tool comp, this is the starting point. Then they make either a 90 degree arc or a 180 degree arc that ends with the tool at the correct radius for the thread. Then they do complete circle(s) with the Z motion for the pitch. (Or they do a series of arcs to make up complete circles depending on the machine.) After doing one or two complete circles to cut the thread they then do an arc that brings them back to the starting point and cancel tool comp back to to the center. This code does that four times.

Because the first arc, which moves from the start point out to the thread radius is not around the center point it is confusing to watch it.

I made a video of the simulator screen which shows tool 7 doing a complete circle then tool 8 doing the offset tangential entry and departure four times.

http://www.youtube.com/watch?v=XcfGtlK9d84]MVI 1363 - YouTube

[brianp-jag]

thats what it looks like when i use the advent software. however when i put it on the machie its different on the thread mill and comes out of center. all of u guys have been very helpful but i am still very lost and confused. you guys have so much more knowledge than i do on this stuff so it is very confusing and im about to pull my hair out becuz of it. i appreciate the help very much and dont know how i can repay you guys for this help. i was litterally thrown to the wolfes on this stuff in this shop. if i wanted to keep a job i had to figure this stuff out. ive had a very hard time doin this simply cuz im not a computer guy. i have enough trouble getting my email let alone using this kind of software. im a machinist not a programmer.im trying very hard to get it but its very slow learning and frustrating as all hell. thanks again and i hope i havnt pissed anybody off becuz of my lack of knowledge thanks brian

[txcncman]

I am willing to walk you through manual G-coding so that you get what you think you want. But I am willing to bet the G-code you have will work just fine. You confidence is lacking because of your experience level.