CDC on an Okuma VMT with OSP300

[gcode]

Our new Okuma VTM-1200 is up and running.

We've run one simple job through it with no issues and are working on the second.

This one involves thread hobbing a 3/4 NPT in the face of the part.

In this case, I could not get CDC to work

There are 3 different places to enter diameter values on the tool offset page.

Our AE said we need to put it in the Corner R field even though it is a milling tool.

 

I have used wear comp for most of my career and it's not working here.

The lead-in move is

G1 G41 X-.022

If you single block through the tool path with 0 on the offset page

you get .022 in Distance to Go when you hit the G41 line

So far so good...

 

with -.010 in the offset page I'd expect to see a Distance to go of X-.032

but I get

X-.009

Y.018

and the tool does not take a cut.

To me this seems like the behavior you'd see when comping a lathe tool

 

Our dealer say we don't have the negative CDC option.

Whether we purchased it and it has not been turned on or we don't own it is unknown at the moment.

 

The records in the back of the machine are inconclusive and it was too late to call

Charlotte yesterday afternoon.

Our dealer suggests we try Reverse Comp or Control Comp.

It was too late in the day to try either of these options, but I don't consider either a

viable long term solution.

 

I got the 1st article part finished by increasing the diameter of the thread hobb pass until it gaged correctly

as I was pretty much stuck until the thread was finished.

 

Are there any Okuma gurus who care to comment??

[Mick]

Negative CDC is an option? I've never heard of that.

 

If it is a milling tool, the comp value should go on the D field (I think it is D.. I'm at home and so can't check on our Multus). Can you take some screen shots of the controller Comp screens?

 

I'm sure YoDoug or MrM will chime in

[Mr. M]

Yes, on the turning centers negative cutter comp for milling is an option. Not that happy about it, but that's what it is. Long term, I'd get the option. For now use G42 and that will get you started.

[gcode]

I played around with reverse comp just before quitting time yesterday, but didn't

have time to try it on the machine.

It looks like the X, Y and Z output are the same, but you get a G42 instead of a G41.

If I understand this, I'd want to use +value to make an ID thread mill path cut bigger???

This will work for a short term solution, but it goes against all the training and experience of all

the guys in the shop.

That strikes me as very dangerous because it's only a matter of time till someone has a brainfart

and scraps a part.

[Mick]

Yes, on the turning centers negative cutter comp for milling is an option. Not that happy about it, but that's what it is. Long term, I'd get the option. For now use G42 and that will get you started.

 

Dang, I will have to check on our Multus Monday. Maybe it is just an option you stateside dudes. Down here we might get it...

[gcode]

Apparently wear comp isn't used much in Japan.

I'm told they use Control Comp.

Wear comp required the use of negative offsets and it's an additional cost option.

 

Having to buy more control options after the fact is one of my bosses pet peeves.

I'm going to let the Okuma dealer explain this, since he's the one who sold us

this "spec'd out" machine.

Hopefully, we already bought it and they just forgot to turn it on during install

[Mr. M]

Hopefully, you could check the data management card also to see.

[gcode]

Hopefully, you could check the data management card also to see.

 

we tried checking the card.

it was inconclusive and it was too late to call Charlotte.

I suspect we couldn't find it on the card cause it wasn't there.

[gcode]

Yes, on the turning centers negative cutter comp for milling is an option. Not that happy about it, but that's what it is. Long term, I'd get the option. For now use G42 and that will get you started.

 

any idea how much $$$ is involved?

[Mr. M]

PM sent

[Greg Williams]

I think Negative comp is on an option on all Okuma OSP controls

[crazy^millman]

Did you guys purchase it or not?

[chris m]

We've been running Reverse Wear on our Okumas for 12 or 13 years because of this; not a big deal here because we just made it across-the-board ( OSP or not ) and train that way.