Rotation Transform issues.

[BM150]

Im having a problem with the rotation angle. While im working in TOP view ive got it working perfectly.

However if i work from the bottom the angle is inverse. I believe this angle is calculated from TOP without caring where you want it to work.

The code is rt_cinc = atan2(sub_m2$, sub_m1$)

 

If anyone could tell me what the sub_m values are and what's the best way to solve my issue.

 

Many thanks.

 

 

[EX-wccprogrammer]

I have not encountered this, but this is my best guess:

 

sub_m1$ is the value of m1$ that is normally transferred to a subroutine.  If you are having problems with the output from a rotated plane, try using m1$.

 

There are a lot of variations of the matrix variables, such as t_wcs_m1$, drl_m1$, cm1$ and sub_m1$.  All of them are derived from the original m1$, but may have been manipulated for different outputs in different areas.

 

HTH 

[EX-wccprogrammer]

From another thread:

 

 

EX-wccprogrammer, on 13 Nov 2014 - 07:37 AM, said:

If you are going to start from scratch, you will want to start with a 'positioning' post.  The matrix has all of the data to position any number of axes that your machine has.  As you change Tool Planes in Mastercam, the matrix changes.  The content in the matrix is the difference between the WCS and Tool Plane.

 

How position for each axis is calculated depends on your machine's configuration.  My machine is Rotary on Rotary, meaning that the B axis rotary rides on the A axis rotary.  This code calculates the positions for my machine:

          if m1$ >= 0, aabs = asin(m7$)
          if m1$ < 0, aabs = 180 - asin(m7$)
          if m5$ >= 0, babs = asin(m6$)*-1
          if m5$ < 0, babs = asin(m6$) + 180

You will need to find the proper formulas that output for your machine configuration.

 

Once you have good positioning output, then you can start adding vector calculations that add simultaneous multiaxis machining.  This is where everything gets complicated.  When one axis moves, it can change the values of all of the other axes.  The calculations to keep up with 6-Axis simultaneous will be brutal.  Each additional axis that a machine has requires an exponential increase in calculations.

 

 

The same logic would apply to your application, but the variables would change.  Play with it, you will find the right formula for your machine. 

[Colin Gilchrist]

The bottom view is rotated 180 degrees from the Top view Matrix. +X on the bottom is -X on the Top.

[BM150]

I have not encountered this, but this is my best guess:

 

sub_m1$ is the value of m1$ that is normally transferred to a subroutine. If you are having problems with the output from a rotated plane, try using m1$.

 

There are a lot of variations of the matrix variables, such as t_wcs_m1$, drl_m1$, cm1$ and sub_m1$. All of them are derived from the original m1$, but may have been manipulated for different outputs in different areas.

 

HTH

 

Thank you.

The t_wcs_m1 gave me the ability to analyse where top was to wcs top.

 

Cheers