CAM Post Process Trouble selecting WCS G code 2

[Buckshott00]

Hello All,

I am working UGNX 7.5.2 windows XP pro 32 bit.

I am using the post builder and I am trying to get a post to select the correct Work Coordinate system G Code.

I think the default value is 0 then it has a command $mom_work_coordinate_number + 53.

I want to set it so that in my turning operations it selects between G54 and G55. Actually all of G54-G59 would be good, but I can't even get it to select correctly now.

Any advice would be much appreciated.

Thanks.

 

[shags72]

In your MCS interface are you clicking details and the putting 1-6 in the offset window?

 

[Buckshott00]

Shags72,

Thank you, yes I am. Using that G block and adding the offset I am able to get one of the Coordinate systems I need.

However, we use multiple bump stops and have a different WCS after each bump.

Does this mean I have to add multiple MCS spindles to get it to work properly?

 

[shags72]

Either that or use an insert but I don't really like using those. I would have to look further to see if there is another way of doing this on a lathe. Haven't done that before.

 

[Buckshott00]

Thanks again for your help. It is working with multiple MCS spindles, but I don't know if that is the best way to set it up. I will keep playing with it.

Thanks again for your help

 

[shags72]

No problem.

 

[Jaydenn]

Buckshott00,

You are doing it correctly.

If you want a different offset, you make a unique MCS.

"Hard Coding" anything into the post is asking for trouble in the future, in my opinion.

J

NX 6.0.5.3

 

[Buckshott00]

Thanks Jaydenn,

So if I have a millturn machine,Z=0 is the finished face of the turnpart. I want to use G54 for Turning and milling, G55 For Facing using a Front Stop, I would use 2 different MCS spindles.

Can I nest them and still get the desired results? I guess I am confused about and Z axis offset when it appears (for this part) that NX is compensating for the Z offset already.

Does that make sense?

 

[Jaydenn]

That has always been how I handle things.

I make my workpiece the "parent" and as many MCS's as I need are the children.

GEOMETRY
|
--->WORKPIECE
|
|---->MCS-G54
|---->MCS-G55
|---->MCS-G56

All of my mcs's are oriented exactly the same. The only difference is the fixture offset number.

Keep in mind that I don't typically program for a mill-turn, so there may be some other "better" way I am unaware of.

J

NX 6.0.5.3

 

[Buckshott00]

Thanks again J,

That's how I ended up doing it. The only thing I wasn't sure of was placement of the MCS's when adding new ones. It seems odd to place a Machine Coordinate somewhere different to accommodate a work coordinate.

Thanks,
--Jake

 

[Buckshott00]

Looking through the program, I lost my Z 0's on the face of the part but I think I can figure out how to fix it. Thanks again guys