Remora - ethernet NVEM / EC300 / EC500 cnc board

Which pulse/rev is best for NVEM RT1052?  


 

At the risk of the blind leading the blind, to me that is not quite the right question. That chart is for your micro-stepping. Like the 800 is 4 microsteps, if you're using a 1.8 deg. stepper. I have always looked at it this way - What are you doing with the motor? If your opening a door or driving a ram, picking 800 would be fine, but using that on a belt or lead screw may very well end up leaving artifacts in the work due to the rougher movement between points. The downside is the more micro-steps you have the more torque you lose. 3200 (16 micro-steps) seams to be a reasonable middle ground that most use as standard. The controller will put out as many steps as directed by LinuxCNC to make a revolution, just a matter of how fast it can do it.

Whatever you chose, that gets figured out when you tell LinuxCNC in your .ini file how many pulses it takes to move one unit. That is set with the SCALE on each axis. Like for me, I have 16 micro-steps (3200) and a 5mm pitch screw, which works out to SCALE = 640 or -640 depending which way you need the motor to move.

Regarding my milling machine and setting up the EC500.
My denford mill is using 12v drivers 
​​that need to sink the 12v to ground to move the axis. 
​​​i tried a bc537 transistor to try and switch the 12v to ground. I originally had this working with a cheap bob. But it seems the ec500 outputs are to low to drive the gate. I'm measuring 3.8v on the ec500's outputs. 
I also tried a IRLZ44n mosfet but that's also the same I can't switch the gate. Both circuits had pull up and down resistors. If I connect 5v straight to the gate (330omh resistor) I can switch the gate and pulse the drive. So I'm thinking the outputs of the EC500 are just not strong enough. 
The IC in the ec500 is the am26ls31. If I connect the differential outputs to a am26ls32 will that restore a 5v stronger signal?

hey murph, i think scott said the outputs were just optocouplers or something like that, see if you can filter through his recent posts,

pheonix, like spyder said its based on application, but start with like 800-1600 and if you get following errors its too high