Great, the 40 GB Seagate Barracuda IDE HDD is dead. I had too many bad sectors while I was trying to install LinuxCNC, anyway. I’ll have to get another IDE HDD and some more RAM’s tomorrow.
In the meantime, I opened one of the unused HY-DIV168N-3.5A Stepper Motor Drivers to figure out the capacitor value at pin 7 (Cosc) of the TB6560AHQ in it.
It is not a 1000 pF like it is in those Blue PCB single board drivers, as stated in a text here, but it’s a 330 pF. This should give us 130 Khz oscillating frequency, and a minimum clock pulse width of 30 us, according to the datasheet.
In the Stepper Configuration Wizard…
Step Time: How long the step pulse is on in nano seconds (Mark of Pulse Width -> 30 us = 30000 ns).
Step Space: Minimum time between step pulses in nano seconds (Space of Pulse Width or Period -> 1000000 / 130000 = 7692.31 ns).
6N137 optocoupler delay is negligible, if we round up the Step Space to 7800 ns. I don’t know if I need the speed gained (500 ns to 50 ns) by changing the diodes to ultra-fast ones yet (also stated in the same text).
I have no idea about Direction Hold or Setup values, some people set it to 20000.
I’ll test all of these with my DSO tomorrow.
I may change that to 100pf for 3 times the speed, but the datasheet states that it was not tested in production. Still a future plan for experimental purposes, maybe then it could be worth changing the diodes, too.
Table travel values should be…
X = 134 mm
Y = 46 mm (crap)
Z = 80 mm
I have been using the drivers at half step setting. I think, I may move up to 1/16 with these settings.
I’ll have to shop for some milling bits and brass on Saturday