Generic 5 axis machining at c180 instead of c0

[wdg5555]

I have a part to machine that I can't access on the rotary without rotating it 180 degrees (Im hitting the x axis limit).
Is there any way using the generic 5 axis post and Mastercam to have the toolpath post out at C180 instead of C0 and of course change the x and y values with it.

For right now I am going to hand edit it so it comes out right. I tried rotating the tool plane and construction plane 180 degrees about Z but it still posted out at C0. Also tried the rotatary options in the toolpath.

[Guest]

Look on your misc ints page....there should be a secondary solution option on MI10 in many posts

[wdg5555]

Look on your misc ints page....there should be a secondary solution option on MI10 in many posts

Ya your right, I looked in there but I didn't see anything that made sense. Didn't understand it until I read what was in the post about the MI's

[Colin Gilchrist]

To Bias the Primary, it should be 'mi4$', set to '180' to get the rotation.

 

Typically, this is only read at the Tool Change though. If you want to 'bias' at a 'Null' Tool Change, you need to enable the 'bias_null' switch inside the post itself...

[Guest]

To Bias the Primary, it should be 'mi4$', set to '180' to get the rotation.

 

Typically, this is only read at the Tool Change though. If you want to 'bias' at a 'Null' Tool Change, you need to enable the 'bias_null' switch inside the post itself...

 

Colin,

 

Does the type of cutting matter?

 

I have seen situations where the mi4 did as you say at the tool change and then seen it go right back to where it wanted to start all along......older post though

[MIL-TFP-41]

What I have had to do in the past was make a point toolpath with at an orientation of something like A-1 deg and C180 deg. The post will position to the C180 position, and when it does to A0 the C "should" stay at 180deg.

[Colin Gilchrist]

The path absolutely does matter, as the "starting vector" is evaluated. It's always hard to say, because it depends on so many things; is is Toolplane Based cutting (3+2) or Live 5X? How close is the starting vector to a travel limit? Is it a Drill Tool path, and 3X or 5X Drill? What are the Primary and Secondary Travel Limits?

 

Most of the time I've used the 'mi4' and 'mi5' controls to "pre-wind" 5X paths, so that the path could cut and allow crossing over zero, without causing an unwind move. For example, on a 5X Gantry Router with +-200 degrees of travel on the C Axis. If you start at C0, then you can only swing 200 degrees before you have to retract. Whereas if you pre-wind to C180 or C-180, then you can get 360+ degrees of travel before you hit the limit.