Hallo everybody,
I have a question on howto calculate a special movement of a CNC
machine. It has nothing to do with the emc2 directly, but I thought here
I will find people who maybe know the answer, so I hope you will help me.
I am writing a CNC simulator (for Siemens 840D) and I need to calculate
the time and the actual path of all the movements that the CNC commands
produce, concerning all ax limits like velocity, acceleration and jerk.
For normal linear movements there is no problem. I already have code
than can do it. But if I use transformations like 5-axis manufacturing
or the TRANSMIT function of the 840D (programming with a Cartesian
coordinate system on a turning machine), I have can have a complete
different movement of the axis than you could assume from reading the
CNC program.
Can you tell me how to do it? Is there some method which is commonly
used for such a problem or do you know where I can get information on that?
Right now I trying to calculate "normal" linear movement and generate a
point cloud of the transformed movement. Then I check if I violate any
limit of the axis and when I do so recalculate the linear movement with
lower limits so that it fits in the transformed movement. This kind of
works, but I sometime get problems when I have very high limits. So I
would like to know if there is a better method.
Thank You
Jascha Schubert
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