CAM: Modal feeds and radii from post 1

[Kasey7]

Hi,

I'm trying to get the hang of post builder for turning. I've done pretty well thus far but I've hit a snag.

If I use the same feed for two consecutive operations (with no tool change), the feed will not appear in the second.
Similarly, if I have the same radii appearing consecutively during an operation (as when roughing using a linear zig strategy towards a large radii) the rad will appear once, but not for the remaining passes.

In the one instance regarding feed, the machine will at least run. But should the operator call up the second operation (out of order of operations), whatever feed remained modal in the lathe will be called up. It may not be the feed that is desired.

In the second instance, regarding identical rads, the machine will run until 2nd instance of the G2/G3 command before stopping. Rads are not modal in our machines and R is required for each line containing G2/G3.

Any ideas as to what I should do to remedy these in post builder?

I'm using NX 7.5.3 and our lathes are Mori Seiki with Fanuc controllers such as MSC-501, MSG-501, & MSX-850 to name a few. I've tried a number of NC posts from the GTAC server, but they were of little help.

 

[joycejo]

This is where you may need to add some custom commands.

After a tool change you could add a custom command for force the feed rate. MOM_force once F

You can set the Circular motion to forced output. Right click on the R word and activate the option.

I would recommend getting some training on Post Builder, yeah easy for me to say. Reading the help docs. You can get several books on Tcl.
And other forums like this the Siemens website has a great forum you shuld be able to access.

Look on the GTAC web site.

http://support.industrysoftware.automation.siemens.com/gtac.shtml

John Joyce
N.C. Programming Supervisor
Barnes Aerospace, Windsor CT
NX6.0.5.3

 

[Jaydenn]

I have a trick for the feedrates.

Simply make you engage/retract feedrates different from the cut feed.

The ever changing feeds will force the feedrate to output.

Works great for me.

J



NX 6.0.5.3

 

[Kasey7]

John,
Yeah, training would be best but it's not in the cards right now. I'm trying to see what I can do in my own, but Post Builder sure isn't intuitive (at least to me).

Jaydenn,
Sounds like a clever work around for feed rates, but it still leaves me with the problem regarding the rads.

 

[Jaydenn]

Here is a picture to describe what John is saying about "force the output"

Jay

NX 6.0.5.3

 

[Kasey7]

Aha! That looks like what I'm looking for.