#### SeymourDumore

##### Diamond

- Joined
- Aug 2, 2005

- Location
- CT

In what manner are the Haas Threading cycles different to the Fanuc?

Regards,

Bill

Bill, I do not know.

What I DO know however is that in virtually all cases where I have to chase the thread OD and then the thread itself again to remove burrs, on a HAAS

I use G76 for the main threading, then chase the OD with the finish tool, then chase the thread itself using G92.

The reason I use G92 is because sometimes there are chatter marks on the V-profiles, and by playing with the X target value I can eliminate them.

In order to do that, I need G92 where explicit X values can be specified.

Now as to an example, the following code:

%

O00102

(THREAD TEST)

(G76 VS G92)

G54

G00 G53 X-6. Z-4.

G50 S1200

(THREADING)

(1.0625-12 UNJ 3A)

G00 G97 T505 S50 M03

G00 X1.066 Z0.05 M08

G76 D0.047 A60 F0.0833 X0.9616 K0.0476 Z-0.1

G80

M09

M05

N9

G00 G53 X-6. Z-4.

(CHASE THREAD)

(1.0625-12 UNJ 3A)

G00 G97 T505 S50 M03

G00 X1.066 Z0.05 M08

G92 X0.9616 Z-0.1 F0.0833

X0.9616

G80

M09

M05

G00 G53 X-6. Z-4.

M30

%

This code, running on a 2001 vintage Haas SL10 WILL produce a perfect thread.

Note that I have slowed the RPM down for the purpose that the position screen can be observed easier.

The very last pass @ X0.9616 is in fact done starting @ X-.1044 Z0 incremental from X1.066 Z.05 in both, G76 and G92 cycles.

On a Fanuc OiTc ( 2007 vintage ), the same code creates a crossed thread with Z shifted approx .02 in the positive direction.

And for the record, here is the original that I've stripped it out of: ( left out the portions unrelated to the threading )

...

G00 G53 X-6. Z-3.

M01

(THREADING)

(1.0625-12 UNJ 3A)

G00 G97 T505 S500 M03

G00 X1.066 Z0.05 M08

G76 D0.011 A60 F0.0833 X0.9616 K0.0476 Z-0.57

G80

M09

N8

G00 G53 X-6. Z-3.

(CHASE OD - VNMG)

G00 G97 T202 S500 M03

G00 G42 X0.7 Z0.06

G96 S320 M08

G01 Z0. F0.01

G01 X0.9367 F0.004

G03 X0.9509 Z-0.0029 R0.01 F0.005

G01 X1.0509 Z-0.053

G03 X1.0568 Z-0.06 R0.01

G01 Z-0.494

G03 X1.0509 Z-0.501 R0.01

G01 X0.945 Z-0.554

G01 Z-0.6

G01 G40 X1.4 F.05

M09

G97 S500 M03

N9

G00 G53 X-6. Z-3.

(CHASE THREAD)

(1.0625-12 UNJ 3A)

G00 G97 T505 S500 M03

G00 X1.066 Z0.05 M08

G92 X0.9616 Z-0.57 F0.0833

X0.9618

G80

M09

M05

G28

T404

M30

%