Fusion gcode not working on machine

Anonymous — Fri, 12 Jul 2019 10:06:12 GMT

Hi all. I have a vmc with siemens 840d control. it has a 5 axis trunnion setup as b/c. the limits of movement in b are -5 +110 degrees. When I try to create some 5 axis simultaneous code the machine always gets a b axis limit switch error. I am not sure what I am doing wrong. attatched are the model I am using and a copy of the code created, and the post processor. I have changed the post processor to only use b and c axis and to give the above limits on b. I hope someone can help please.

Re: Fusion gcode not working on machine

bob.schultz — Fri, 26 Jul 2019 22:27:49 GMT

There are a couple of changes you need to make where the rotary axes are defined in the onOpen function.

  if (true) { // change to true
    //var aAxis = createAxis({coordinate:0, table:true, axis:[1, 0, 0], range:[-120.0001, 120.0001], preference:1});
    var bAxis = createAxis({coordinate:1, table:true, axis:[0, 1, 0], range:[-5.000, 360.000], preference:1});
    var cAxis = createAxis({coordinate:2, table:true, axis:[0, 0, 1], range:[0, 360], cyclic:true});
    machineConfiguration = new MachineConfiguration(bAxis, cAxis);  // change to bAxis

    setMachineConfiguration(machineConfiguration);
    optimizeMachineAngles2(0);
  }

This will output the actual rotary axes positions instead of the tool axis vector, which is currently being output in A3, B3, C3.

You will now find that the post will error due to the limits of B-axis being exceeded, just like on your machine. This is because the tool tilts more than 110 degrees. You can see this by changing the limits of the B-axis and looking at the output for the B-axis.

var bAxis = createAxis({coordinate:1, table:true, axis:[0, 1, 0], range:[-5.000, 360.000], preference:1});

B-axis exceeds limits
N161 G1 X-14.673 Y24.484 Z-22.024 B120.92 C=DC(61.504)

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Fusion gcode not working on machine

Re: Fusion gcode not working on machine