need help on Okuma

[imokru16]

Hi all, I am a newbie to some of this. I need help with G71 on Okuma Lathe. Our machine is set up in inch. I am having trouble converting over M30x2.0 threads to inch for the G71 fixed cycle. Can anyone help? Thanks,Kent

[CNCZILLA]

Hello. What control do you have. You should be able to go into the parameters and place your machine into metric mode and be fine. Let me know what control you have and i can tell you where to go in the parameters to do this.

[imokru16]

osp-p200L Brand new Heritage... Let me forwarn you that I am NEW to this. I have only writen 5 programs in my life and they have been on this machine. All of our other programs run in inch. I would rather not change over machine to run in metric for one program and then have to switch it back. I have never had CNC programing classes, but have done good so far on this machine. I have a guy from Okuma that has answered my questions. He is out sick right now. When I initially asked him he said to convert the fixed cycle over for the metric to inch. I have the rest of this program already done in inch. Thoughts?

[CNCRim]

try

[littlerob]

AHHHH-my-spacebar-won't-work!!

Divide-metric-TPI-by-25.4

2/25.4=.0787

In-G71-line-F.0787-easy-just-fix-my-keyboard

Robert

[imokru16]

Thanks, That's what I came up with initially. The very first time I wrote a thread cycle for 1/2-13 threads, I wrote it like this.
G71 X.405 Z1.100 B60 D.006 U.001 H.095
$M73 M32 L.050 F1 J13

So I was thinking the M30x2.0 should be,

G71 X1.063 Z1.625 B60 D.006 U.001 H.059
$M73 M32 L.050 F1 J12.7

Seeing as how in the 1/2-13 threads the J13 were threads per inch, the M30x2.0 the J12.7 would be correct. Am I thinking right?

[Algirdas]

Am I thinking right?
no. F (feederate) is thread pitch. Make sure, feederate per revolution is assigned (G95 , G96 see help on screen - info button).

[littlerob]

no. F (feederate) is thread pitch.

That-is-why-he-put-the-J-variable-in.-IE-F=1-(per-1-inch)-J=12.7(threads-per-inch)

If-I-were-you-I-would-dump-the-J-U-L-values-completely,-dump-both-M-codes-and-change-the-feed-to-.0787.--It-is-very-simple.

No-need-to-change-parameters-G71-w/-G97-Is-automatically-in-FPR-it-cant-do-anything-else-unless-it-is-in-G95-Algirdas-G95-is-feedperminute-and-G96-isCSS-on-that-is-not-helping-anything-unless-you-are-trying-to-build-examples-of-scrap-parts.

I-hate-macs,-stupid-spacebar

[imokru16]

littlerob, so your saying


G71 X1.063 Z___ B60 D.006 H.056 F.0787

And that's all?

[littlerob]

littlerob, so your saying


G71 X1.063 Z___ B60 D.006 H.056 F.0787

And that's all?

Exactly!--I-use-the-U-value-occasionally-but-only-when-I-am-having-problems...The-G71-code-will-break-the-finish-passES-down-for-you.

Robert

[trampus]

Hi all, I am a newbie to some of this. I need help with G71 on Okuma Lathe. Our machine is set up in inch. I am having trouble converting over M30x2.0 threads to inch for the G71 fixed cycle. Can anyone help? Thanks,Kent

Even if it is a metric thread it has a designated decimal thread per inch recognized just by it's pitch and leave the machine where it's at. Just a though.

[imokru16]

Thanks so much guys!!!!