RE: [CAD_CAM_EDM_DRO] EMC questions

Thank you - this is the kind of info I am looking for. More to the point is how do you tell it to use steppermod.o or freqmod.o. How do you tune it - are they ini files you can edit? I am still researching and finding more bits of info. The last time I used linux was in college. I Finding time to tinker with it is also a problem. I am a ms windows/dos background myself so there is going to be a learning curve.

thank you
sam
Tim Goldstein <timg@...> wrote:

> "Stepper motor control is implemented using a second real-time task
> that runs at 100 microseconds. This task writes the parallel port
> output with bits set or cleared based on whether the a pulse should
> be raised or lowered. This gives an effective period of 200
> microseconds for a full up-and-down pulse, or a 5 kilohertz
> frequency."

Like much of EMC documentation you can not believe all that you read.
This is not correct. I have EMC running with a pulse stream of 25
kilohetz. It will actually go somewhat faster depending upon the speed
of your system. For stepper use you can get the fastest rates with
steppermod.o, but the pulse stream is not evenly paced. You will get a
better pulse stream pacing with freqmod.o, but it take more system
resources. On the system you are running either one of the motion tasks
will give you a much higher rate than 5 Khz if you tune it properly.


Tim
[Denver, CO]
Sherline & Taig products at Deep Discount
Mach1 & DeskCNC with credit card ordering
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