Heidenhain 426 post processor bad toolpath

[reisaXWBA5]

Hi.

Im trying to machine  in a Heidenhain 426 control with the toolpath generated with Fusion 360 and the simulation at the machine was bad.

Some  of the circular interpolations make no sense.

I attach photos of the Fusion 360 toolpath and the simulation on Heidenhain 426.

¿Why do i get those bad moves?¿The circular interpolations are not correct?

(I had the same issue on a Fidia control and the solution was...... manage IJK in absolute values and circular interpolation only on G17XY plane, linearising other planes and helicals.)

¿What can i do?

¿Can i configure the post processor for  write Linear moves only? To make all the curves formed by lines.

 Please, i have a big milling machine waiting for an answer.

Thank you.Fusion 360 generated toolpathHeidenhain 426 simulation

[boopathi.sivakumar · Accepted solution]

Hi @reisaXWBA5..

To linearize the arc moves and helical moves. open the .cps file in any editor and search for this two line in any editor

allowHelicalMoves = true;
allowedCircularPlanes = undefined; // allow any circular motion

 And make it to something will linearize the arc and helical moves

allowHelicalMoves = false;         // False to linearize the helical moves
allowedCircularPlanes = 0;         // disallow any circular motion

if you want to have arcs only on XY you can also set the post to do so for that

allowedCircularPlanes = (1 << PLANE_XY);

Let me know how it works for you

[reisaXWBA5]

Thank you for the rapid answer.

The simulation seems ok.

Im going to start machining in a few moments.