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Okuma mill cutter comp

Brian Pallas

By Brian Pallas,
in Industrial Forum

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Brian Pallas Rookie

Brian Pallas

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Posted

So, I've ran into from time to time on programs for out 2 Okuma mills where the operator can't change the tool diameter offset without getting an alarm.  The control is OSP10M/OSO-U100M. Everytime it happened I thought "I need to figure that out", but never did. I think I found out today.  It looks like the Okuma control actually turns comp on on the line after the line that has the G41.  So, for milling circles, if there is a G2/G3 command after the G41 line it alarms out.  Having another G1 line in between fixed it on a program we were running today.

 

I changed this:

 

G0 G90 X0. Y0. S2700 M3
G56 H4 Z6. M8
Z.1
G1 Z-.53 F60.
X.0921 F21.6
G41 D4 X0. Y-.534
G3 X.634 Y0. Z-.5144 I.0921 J.534
X-.634 Z-.4831 I-.634 J0.
X.634 Z-.4519 I.634 J0.
X0. Y.534 Z-.4363 I-.5419 J0.
G1 G40 X.0921 Y0.
X0.
G0 Z.1
Z6.
 
to this:
 
G0 G90 X0. Y0. S2700 M3
G56 H4 Z6. M8
Z.1
G1 Z-.53 F60.
G41 D4 X.0921 F21.6
X0. Y-.534
G3 X.634 Y0. Z-.5144 I.0921 J.534
X-.634 Z-.4831 I-.634 J0.
X.634 Z-.4519 I.634 J0.
X0. Y.534 Z-.4363 I-.5419 J0.
G1 G40 X.0921 Y0.
X0.
G0 Z.1
Z6.
 
And then the cutter comp worked at the machine like it was supposed to.  It seems like this is the fix.
 
 Wanted to see if:
1. That is actually the explanation and fix for this problem.
and
2. What to do to my post/mastercam settings to get the output that will work for the Okuma mills?

 

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Orvie Newbie

Orvie

Posted
Posted

I had this issue with 3 brand new machines, OSP300.

Check these parameters & make sure there is some value for compensation deviation.

We received our machines with zero tolerance as the setting.

I have seen this many times with Fanuc arc tolerance settings also.

post-26440-0-51193800-1478716469_thumb.jpg

post-26440-0-32423300-1478716486_thumb.jpg

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Brian Pallas Rookie

Brian Pallas

Posted
  • Author
Posted

Brad - We program the centerline of the tools.  So start value is 0.  On the program I was having the issue with yesterday, changing the offset at all, positive or negative, caused an alarm.

 

Orvie - Thanks.  I looked through our machines parameters and couldn't find a page that looked like that.  I'll have to look in the manual and see if it is maybe a numbered parameter?  Seems like a likely possibility that something like this could be the issue.

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crazy^millman Veteran

crazy^millman

Posted
Posted

 

So, I've ran into from time to time on programs for out 2 Okuma mills where the operator can't change the tool diameter offset without getting an alarm.  The control is OSP10M/OSO-U100M. Everytime it happened I thought "I need to figure that out", but never did. I think I found out today.  It looks like the Okuma control actually turns comp on on the line after the line that has the G41.  So, for milling circles, if there is a G2/G3 command after the G41 line it alarms out.  Having another G1 line in between fixed it on a program we were running today.

 

I changed this:

 

G0 G90 X0. Y0. S2700 M3
G56 H4 Z6. M8
Z.1
G1 Z-.53 F60.
X.0921 F21.6
G41 D4 X0. Y-.534
G3 X.634 Y0. Z-.5144 I.0921 J.534
X-.634 Z-.4831 I-.634 J0.
X.634 Z-.4519 I.634 J0.
X0. Y.534 Z-.4363 I-.5419 J0.
G1 G40 X.0921 Y0.
X0.
G0 Z.1
Z6.
 
to this:
 
G0 G90 X0. Y0. S2700 M3
G56 H4 Z6. M8
Z.1
G1 Z-.53 F60.
G41 D4 X.0921 F21.6
X0. Y-.534
G3 X.634 Y0. Z-.5144 I.0921 J.534
X-.634 Z-.4831 I-.634 J0.
X.634 Z-.4519 I.634 J0.
X0. Y.534 Z-.4363 I-.5419 J0.
G1 G40 X.0921 Y0.
X0.
G0 Z.1
Z6.
 
And then the cutter comp worked at the machine like it was supposed to.  It seems like this is the fix.
 
 Wanted to see if:
1. That is actually the explanation and fix for this problem.
and
2. What to do to my post/mastercam settings to get the output that will work for the Okuma mills?

 

Can I ask a dumb question here? Did you try L(which is R on some Okumas) and see if the machine acted differently?

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Goldorak Newbie

Goldorak

Posted
Posted

Ron - No I never tried going the other direction and seeing if that got the same results.  I'll check it out tomorrow.

 

Goldorak - Wear comp. Yeah, your code looks how I would expect.  

 its the MPMASTER_OKUMA post from IHS, it works really well with all our OSP gen.  from OSP500M to P300

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mkd Newbie

mkd

Posted
Posted

Question: Is the CC value in the control greater than .0921 ??? already answered

 

 

seems a bit awkward having the two linears at acute angles. Maybe causing some confusion there.

 

what about:

G41 D4 X0. Y-.534
G3 X.634 Y0. Z-.5144 I.0921 J.534
X-.634 Z-.4831 I-.634 J0.
X.634 Z-.4519 I.634 J0.
X0. Y.534 Z-.4363 I-.5419 J0.
G1 G40 X0. Y0.
X0.
G0 Z.1
Z6.

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Mick Contributor

Mick

Posted
Posted

Question: Is the CC value in the control greater than .0921 ??? already answered

 

 

seems a bit awkward having the two linears at acute angles. Maybe causing some confusion there.

 

what about:

G41 D4 X0. Y-.534

G3 X.634 Y0. Z-.5144 I.0921 J.534

X-.634 Z-.4831 I-.634 J0.

X.634 Z-.4519 I.634 J0.

X0. Y.534 Z-.4363 I-.5419 J0.

G1 G40 X0. Y0.

X0.

G0 Z.1

Z6.

 

I posted up some code that worked on the exact same controller we have in our shop, and I queried what post the op was using, but never got a response.

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