Haas post will not do a Negative "B" (tilit) rotation

[bhurst]

I have a 5 Axis HAAS. I am trying to do the first plane @ A0.0. B-8.0( According to my WSC) for 1st work plane. Then rotate A+90 and Tilt to B+8. for the next work plane. Then finally for the last one stay at A+90 (rotation) and tilt back to B-8. This is the shortest amount of travel time table travel time. My question is how can I get this to post out the way I want. If I cant can I just manually change the A and B to what I want?  

 

 

T-3584(AKA 203 OP)-17 - 4CR.Z2G

[Colin Gilchrist]

Try using the 'mi4$' and 'mi5$' values in the Miscellaneous Integers to bias the starting angles to what you want for each operation.

 

In the stock VF_TR Haas post, there is also a switch called 'bias_null' that lets you apply the bias settings at a Null Toolchange. You'll want to be sure that is enabled so that you can bias the start position for when a tool number repeats.

[bhurst]

Thanks for the reply!

 

Do I do this in the machine definition manger or actually open the post and edit that? I'm a greenhorn when it comes to editing the  machine definition or posts.

 

[Colin Gilchrist]

For setting 'bias_null', you have to make that change in the PST file.

 

Open the PST file in a text editor, then search for the string 'bias_null'. You are looking for the variable initialization, which looks like this:

bias_null   :  0

Change the '0' to a '1', and you are all set.

 

The other options "miscellaneous integers" are actually set inside each toolpath operation. Open the operation parameters, find the 'Misc. Values' page, and make your changes there.

 

The 5 Axis toolpaths are controlled by using the Misc Values. This gives you a bunch of control over the individual toolpaths.

[bhurst]

Colin,

 

I did what you suggested in the tool path-parameters-misc. values and changed the "initial primary" to -8 which is what I was looking for. This did correct the issue. It now posts the way I want.

Thanks for your time in helping me with this.

[Colin Gilchrist]

Glad you got it working bhurst.