[rylanrouge]

We have a Okuma 2SP-V5 Lathe. Our threading cycle is in Inches, we are going to run the program in metric. Can anyone help me convert the G76 lines into metric...

(****Inch program*****)
N7G0G59X14.Z9.(TL #141 M88 X 3 ID THREAD)
G50S450
T0700
G97S450M3
G0X3.465Z.5T0707M08
M52
X3.16Z.087
G76P021060Q0040R0040
G76X3.465Z-1.2F.118P0523Q0100A60
G0X3.282Z.5
G0X14.Z9.T0000M9

[rylanrouge]

Also, when running the program in Metric, we had to slow the spindle speed. Example:
When running the O.D. rougher (inch program)=
G50 S450
G96 S750 M3
(feed= F.013)
---------------------
when switching the machine to metric, we had to slow the speed or else the inserts would burn up. Currently the metric program speeds for the O.D. rougher are:
G50 S170
G96 S262 M3
(feed= F.33)

Is there a parameter that needs altered??? I always thought that speed was speed and it didn't matter if you were in metric or inch. I'd like to have the Inch program Speeds in my metric program... just not sure how to make that happen. Any suggestions?

[OkumaWiz]

G97 will remain the same whether inch or metric since it is direct RPM. G96 is either surface FEET per minute or surface METERS per minute depending on using inch or metric. So recalculation is needed.

G76 is for corner rounding on my Okuma's so I'm guessing that you have a Fanuc'd up control right?!

Multiply your inch values by 25.4 for metric of course, but I'm not sure the usage of the P values in your program.

On Okuma's OSP control, math functions in the lines of code is possible, but not so sure if it will work on yours - probably not if Fanuc.

Best regards,

[rylanrouge]

Our Okuma has Fanuc control.
The 2nd G76 line has P0523, which is the height of the thread. In inches, that equals
.523" In metric that number equals 13.2842mm. I had put 13284.2 in the program
(P13284.2) and the machine didn't like that one bit.
Would like to know what the exact number should be for P0523 in metric
This is what we're currently running and it's working pretty good.

G0X88.001Z12.7T0707M08
M52
X80.264Z2.22
G76P021060Q0150R0.15
G76X88.001Z-30.48F3.P1840Q0250A60
G0X83.368Z12.7
G0X355.6Z228.6T0000M9

And I think the conversion for speed is 3.28? But like I said, I wasn't sure if there was a parameter that could be changed, so the G96 speeds can stay in FPM...
Thanks.

[OkumaWiz]

I don't believe that you can use a decimal place in your P number, so try dropping the decimal and the digit behind it. IE: P13284 Q6350

Think that will work...

Best regards,