Need Help!- new to thread milling

[TOM R]

Hello Members, I need help programming for a 1/4-20 2b internal threads with a multi flute .180 Dia. threadmill in a Nakamura Wt-300 twin spindle with a fanuc 18 control. Both spindles have C axis. Left turret only has Y axis. I have a bolt pattern 4.125 dia. by 6 plcs at .250 minimum thd. depth. Vargus software only gives it to you on centerline. x and y. Can anyone here give me some help on accomplishing this. the Mat'l is 316L St. Stl. I never threadmilled in the past.

Reagrds, Tom

[HuFlungDung]

I've never thread milled on a turning center, but I loaded up my OneCNC XR4 lathe software and took a stab at programming it. Seemed to be easy enough, but then I don't have a machine to run it on, and that would be necessary before I could claim to have done it

I used a FANUC post for this, I didn't have anything set up particularly for your machine. It probably needs some adjustments.

If you want to see how it works, I'd recommend that you get in touch with OneCNC in Florida for an online demo, where they can show you how it is set up and so on. You're probably going to want some sort of a software solution that you can apply whenever you want to.

Whatever you do, dry run the program to see how it looks before you cut any metal with it!

[HuFlungDung]

Just studying my own program a bit, it may be thread milling at twice the desired hole diameter. I might need some coaching of my own

[TOM R]

Thank you Moderator, I'm not sure if this will work for me. I thank you for your efforts though. Were going on the right track. Maybe we both can learn something here.

But, I was looking for G03 programming other than a G12.1 with two passes. Then I can adapt this to other needs for threaded bolt patterns.

I really need a hand with this. to know how it works. My Cad does not support this.

Regards, Tom

[tfisher]

I've only done this on a cnc boring bar so not sure this will help at all. I do it using a sub which needs to be written incrementally so you can move to hole location and call the sub. For me the sub would look something like this.

GO X Y HOLE LOCATION

CALL SUB
G90 GO Z-? DEPTH OF THREAD
G91 G1 X.25 G41 FEED TO THREAD DIAMETER INC.
G3 I-.25 Z.05
GO X-.25 G40
G90 GO Z? RETURN HEIGHT FOR TOOL

[HuFlungDung]

Originally Posted by TOM R Thank you Moderator, I'm not sure if this will work for me. I thank you for your efforts though. Were going on the right track. Maybe we both can learn something here. But, I was looking for G03 programming other than a G12.1 with two passes. Then I can adapt this to other needs for threaded bolt patterns. I really need a hand with this. to know how it works. My Cad does not support this. Regards, Tom

I'm assuming this hole pattern is laid out in the face of the part? How do you want to cut it, using X, Y and Z only (and spindle clamped for each hole)?

[TOM R]

Hello Moderator, THANKS, AGAIN FOR YOUR FEED BACK. Sorry for the lapse in time. Yes this is a threaded bolt pattern FOR a 1/4-20 2b on the faces of the front and rear of the part. Also, The spindle is rotated and clamped. On the C axis for spotting and drilling. So it would be the same for the thread milling. The first hole to be thread milled in the left spindle would be at 105 degrees. for 3 places.

Below is the drilling for the bolt patterns at 120 degrees for the left spindle.

N6(#7 LIVE FACE DRILL L SPINDLE) 
G40G80G18G99 
G28U0W0
G28V0M91 
G28H0
G50S1500 
M428(L SPINDLE MODE) 
G54M91 
G0T0606
M470 
G97S1100M89
Z.1C105. 
X3.25M6
G83Z-.435Q500F.003 
G80
C225.
G83Z-.435Q500F.003 
G80
C345.
G83Z-.435Q500F.003 
M90
G0Z.1
G80G28H0 
G28U0M7
G28W0V0M41 
M103 
M0(CLEAR CHIPS)
M106

The first hole to be thread milled in the right spindle would be at 45 degrees. for five places at 60 degrees.
Below is the drilling for the bolt pattern for the Right spindle.

N4(#7 LIVE FACE DRILL R SPINDLE) 
G40G80G18G99 
G28U0W0
G55M491
G28H0
G50S1500 
M427(R SPINDLE MODE) 
G0T0428
G97S1100M489 
G0Z-.1C45.M6 
X4.125 
G83Z.375Q500F.003
G80
C105.
G83Z.375Q500F.003
G80
C165.
G83Z.375Q500F.003
G80
C225.
G83Z.375Q500F.003
G80
C285.
G83Z.375Q500F.003
G80
C345.
G83Z.375Q500F.003
G0Z-.1 
G80G28H0.M490
G28U0M7
G28W0
M441 
M01

Because of location of cross milling between the jaws.

Regards, Tom

[TOM R]

Hello members, I came with this using the Vardex generator. Substituting the X's for my Bolt circles. I haven't tried the numbers in the machine. Does it look ok, with this format?

Left Spindle Code

(1/4-20 2B INT THREAD 3 PLCS. 3.250 BC. LEFT SIDE)
N8(#7 ACCUPRO 76418375 1/4-20 THD-MILL HEL3F UN .180 DIA. L SPINDLE) 
G40G80G18G99 
G28U0W0
G28V0M91 
G28H0
G50S1500 
M428(L SPINDLE MODE) 
G54M91 
G0T0808
M470 
G97S1100M89

Z.150 C105. 
X3.25 M6
G90 G00 G57 X0 Y0
G43 H10 Z0 M3 S6647
G91 G00 Y0 Z-0.303
G01 G41 D60 X3.2752 Y-0.1016 Z0 F3.43
G91 G03 X3.3516 Y0.1016 Z0.0033 R0.1016 F3.43
G91 G03 X3.250 Y0 Z0.0500 I-0.1268 J0 F11.42
G91 G03 X3.14854 Y0.1016 Z0.0033 R0.1016
G00 G40 X3.2248 Y-0.1016 Z0
G00 X3.250 Z.150

C225.
X3.25
G90 G00 G57 X0 Y0
G43 H10 Z0 M3 S6647
G91 G00 Y0 Z-0.303
G01 G41 D60 X3.2752 Y-0.1016 Z0 F3.43
G91 G03 X3.3516 Y0.1016 Z0.0033 R0.1016 F3.43
G91 G03 X3.250 Y0 Z0.0500 I-0.1268 J0 F11.42
G91 G03 X3.14854 Y0.1016 Z0.0033 R0.1016
G00 G40 X3.2248 Y-0.1016 Z0
G00 X3.250 Z.150

C345.
X3.25
G90 G00 G57 X0 Y0
G43 H10 Z0 M3 S6647
G91 G00 Y0 Z-0.303
G01 G41 D60 X3.2752 Y-0.1016 Z0 F3.43
G91 G03 X3.3516 Y0.1016 Z0.0033 R0.1016 F3.43
G91 G03 X3.250 Y0 Z0.0500 I-0.1268 J0 F11.42
G91 G03 X3.14854 Y0.1016 Z0.0033 R0.1016
G00 G40 X3.2248 Y-0.1016 Z0
M90
G00 X3.250 Z.150
G80G28H0 
G28U0M7
G28W0V0M41 
M103 
M0(CLEAR CHIPS)
M106

Right Spindle Code

(1/4-20 2B INT THREAD 3 PLCS. 3.250 BC. RIGHT SIDE)
N8(#7 ACCUPRO 76418375 1/4-20 THD-MILL HEL3F UN .180 DIA. L SPINDLE) 
G40G80G18G99 
G28U0W0
G55M491
G28H0
G50S1500 
M427(R SPINDLE MODE) 
G0T0838
G97S1100M489 

G0 Z-.150 C45.M6 
X4.125 
G90 G00 G57 X0 Y0
G43 H10 Z0 M3 S6647
G91 G00 Y0 Z-0.303
G01 G41 D60 X4.1502 Y-0.1016 Z0 F3.43
G91 G03 X4.2266 Y0.1016 Z-.0033 R0.1016 F3.43
G91 G03 X4.125 Y0 Z-.0500 I-0.1268 J0 F11.42
G91 G03 X4.0234 Y0.1016 Z-.0033 R0.1016
G00 G40 X4.0998 Y-0.1016 Z0
G00 X4.125
Z-.150

C105.
G90 G00 G57 X0 Y0
G43 H10 Z0 M3 S6647
G91 G00 Y0 Z-0.303
G01 G41 D60 X4.1502 Y-0.1016 Z0 F3.43
G91 G03 X4.2266 Y0.1016 Z-.0033 R0.1016 F3.43
G91 G03 X4.125 Y0 Z-.0500 I-0.1268 J0 F11.42
G91 G03 X4.0234 Y0.1016 Z-.0033 R0.1016
G00 G40 X4.0998 Y-0.1016 Z0
G00 X4.125
Z-.150

C165.
G90 G00 G57 X0 Y0
G43 H10 Z0 M3 S6647
G91 G00 Y0 Z-0.303
G01 G41 D60 X4.1502 Y-0.1016 Z0 F3.43
G91 G03 X4.2266 Y0.1016 Z-.0033 R0.1016 F3.43
G91 G03 X4.125 Y0 Z-.0500 I-0.1268 J0 F11.42
G91 G03 X4.0234 Y0.1016 Z-.0033 R0.1016
G00 G40 X4.0998 Y-0.1016 Z0
G00 X4.125
Z-.150

C225.
G90 G00 G57 X0 Y0
G43 H10 Z0 M3 S6647
G91 G00 Y0 Z-0.303
G01 G41 D60 X4.1502 Y-0.1016 Z0 F3.43
G91 G03 X4.2266 Y0.1016 Z-.0033 R0.1016 F3.43
G91 G03 X4.125 Y0 Z-.0500 I-0.1268 J0 F11.42
G91 G03 X4.0234 Y0.1016 Z-.0033 R0.1016
G00 G40 X4.0998 Y-0.1016 Z0
G00 X4.125
Z-.150

C285.
G90 G00 G57 X0 Y0
G43 H10 Z0 M3 S6647
G91 G00 Y0 Z-0.303
G01 G41 D60 X4.1502 Y-0.1016 Z0 F3.43
G91 G03 X4.2266 Y0.1016 Z-.0033 R0.1016 F3.43
G91 G03 X4.125 Y0 Z-.0500 I-0.1268 J0 F11.42
G91 G03 X4.0234 Y0.1016 Z-.0033 R0.1016
G00 G40 X4.0998 Y-0.1016 Z0
G00 X4.125
Z-.150

C345.
G90 G00 G57 X0 Y0
G43 H10 Z0 M3 S6647
G91 G00 Y0 Z-0.303
G01 G41 D60 X4.1502 Y-0.1016 Z0 F3.43
G91 G03 X4.2266 Y0.1016 Z-.0033 R0.1016 F3.43
G91 G03 X4.125 Y0 Z-.0500 I-0.1268 J0 F11.42
G91 G03 X4.0234 Y0.1016 Z-.0033 R0.1016
G00 G40 X4.0998 Y-0.1016 Z0
G00 X4.125
Z-.150
M90
G80G28H0.M490
G28U0M7
G28W0
M441 
M01

Regards, Tom

[dumitru jucan]

hello!!

i/m an older graduate cnc school,but my hnads-on experience is starting now.could,someone from here,to advise me the easy way,to can write down programs,and,at the end,to run them,on the mill??