Haas VR11 G43/G143

[Steve Landkamer]

Note: I posted this in the Industrial Forum also to see if any one was doing this.

 

I have tweaked in several 5-axis posts in my 15 years experience with Mastercam but this one is stumping me.

So my question is: Is anyone running a Haas VR11 with A&B on the spindle and using a mix of G43 & G143 in the same program?

Not only having G43 & G143 in the same program but....only subtracting the pivot length from the Z while in G143.

Below my code examples is what his request to me is. Has anyone done this successfully?

 

I have tried to do the "math" in the output post blocks but it won't let me recalculate the "zabs_s" or "zout" before or inline.

 

For example; here is some code out of one of my other customers VR11 posts:

G0 G54 G90 X4.2032 Y2.7257 B0. A-15. S1069 M3
G143 H29
Z3.8722
Y1.7163 Z.1051
G1 Y1.6905 Z.0085 F6.42
X3.7068
X3.2105

 

What the new customer is looking for would be:

G0 G54 G90 X4.2032 Y2.7257 B0. A-15. S1069 M3
G143 H29
Z-9.5849
Y1.7163 Z-13.352
G1 Y1.6905 Z-13.4486 F6.42
X3.7068
X3.2105

 

Quote from my customers email to me:

I need to post the absolute XYZ positions of the points on the model.

I do not need ANY position compensations relative to the rotary axes.

The only position compensation that I need is to subtract the pivot length from the Z value when it G143 mode.

G143 should be used any time A or B <> 0

This is what I need:

When in G43 mode Z = Z

When in G143 Z = Z - pivot Length

 

 

If you need an explanation of why I would want to do this, keep reading below...

I want to use both G43 and G143 in the same program; using the same H#'s; and the same work plane.

G43 for XY planes, G143 for all other planes.

G43 allows for G2; G3; and canned cycles.

G143 compensates for A & B; but limits me to G0 & G1 interpolations.

The problem with doing it any other way is that you wind up with multiple H#'s, work planes, or you have to program everything in one mode G43 or G143.

[mgsanchez]

Hmm... that is interesting. I run one also, but I program everything G43 in 3 axis or as gage length programming. I normally do not use G143 because of all the restrictions (more trouble that it is worth). I fixed my post to output all of the Haas 5 axis G-Code canned cycles (i.e. G161, G162, G163, G164, G165, G 166, G169). I'm not sure if the 5 axis G-code canned cycles are compatible with G143.

 

Sorry, I know that wasn't much help.

[Chris McIntosh]

I can confirm that this is correct, G43 for when the tool is vertical, G143 in all other situations. Don't ask me why they are running this way, but they are. I can also say that with G143 there are issues with some of the canned cycles as mgsanchez has indicated. These machines work this way, don't ask questions, it will only hurt in the long run!