PWM not quite working

There's more to it than just resolution. Even if EMC2 had the resolution, it won't scale properly to use a 1-2ms pulse width to scale 0-max RPM as I explained previously.

I did tweak my CAM post to give me a S1 and 2 second pause before commanding the spindle speed to allow the ESC to arm.

The previously suggested www.logicnc.com/rcnc.html works, but I'm not going to get one. I've decided to search for a regular servo amplifier after determining I won't need a very high current rating after all. I put hall magnets in the spindle in case it was needed.

If you want to control an RC ESC directly from the parallel port go with the logicnc part, or just expect you'll have only an on/off functionality.

Greg

Hi!
Maybe i do something wrong, but i have no major problems with my ESC and LinuxCNC, and actively use it. At least, scaling always works as expected (i get at least 10 fine steps). My connection currently is still glueless, and nothing was changed in my setup since i show my config and ESC model in posts above. But please take into account that my ESC was reprogrammed (using its official feature) to use 1...2 ms times, rather than standard 1.5...2 ms. I have LinuxCNC version 2.4.7 used from LiveCD.
But i now still look for adding a microcontroller. The reasons for it unfortunately can't be solved even using hardware PWM card or 35 USD gadget. These are: No loopback alarm signal when spindle is not rotated while it must; and, due to 'smart' nature of modern ESCs, these are not start rotating when i change 0% to 10% duty cycle, they think it's a pilot's mistake. To start rotating, i need 0% ->50% -> 10% sequense or so. (stopping works immediately).
I currently can recommend glueless connection only if you really no have any other ways to spin your spindle... I have no idea why sometimes pulses are too coarse, as other people reports. (it is reproduceable by someone else?)
But can recommend using ESCs, they are pretty effective and low-loss devices.
I think to develop tiny atmel's based open source control device for ESCs, hope it will be also useful by someone else