I'm not sure of what you mean by the CAM system or if it is relevant to 
what I do. Possibly someone can explain.

I write Java code that exports g-code files to run a small CNC router or 
CNC desktop mill.   I am considering adding a lathe like attachment 
bolted to the table (essentially a small lathe with stepper motor).   In 
this case the center of rotation is well known and computing the linear 
velocity vector due to rotation is straight forward in either machine or 
workpiece coordinates.
Can the trajectory planer deal with this or would I need to add 
additional steps?

Craig


On 6/24/2015 3:09 PM, Andy Pugh wrote:
>
>> On 24 Jun 2015, at 19:58, Philipp Burch <[email protected]> wrote:
>>
>> Without having tested it, I'd expect it to work as follows:
> (Exact description of what happens)
>
> The motion controller has no way to know where the centre of rotation is, so 
> it does as described.
>
> If you want to control tool feed rates with combined motions you need to let 
> that happen in the CAM system which can be told where the centre of rotation 
> is and then use inverse time feed.
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