New Youtube chanel for CNC .... anything ! toma cnc

Gr8 new Tommy, I'vebeen following you for a while now, hope to learn more from your videos.

Having a hard time setting up some equipment for recording stuff in the shop, so far i just made a magnetic phone holder for the Samsung Note 9, and it does the job nicely, but since i have not done any recording in the last 25 years, it is a challenge to get the stuff right.
I am hanging my hopes on the " i learn stuff extremely quickly " hanger since that is the case for me regarding almost anything.
I did say "almost", did i ?
Today i did some tests with a BTS7690 (do check this as i am not sure) that are sold for arduino stuff, they can do 43A from the spec sheet, but i would not go above 15A with them, i got 5 of them since they are cheap and i do have some 15 or more small servo drives. Oh, and they have a current sense output, so i will try to use that to limit the current from Linuxcnc using two resistors and two diodes per drive.
In the spec sheet that output is also used for over current fault, but it is set at over 60A, so pretty useless. But since in normal use that pin outputs voltage, or more precisely current that is related in real time with the output current.
Tested with the included "etch servo" config in Linuxcnc and it does work properly after adding a 0 in the ini file (in TRAJ under home another 0 must be added or it will not start), and changing places between PWM and Enable outputs and some tuning.
Now i need to find the threshold for the parallel port input and calculate the required resistor and do some testing tomorrow.
Nice little drives, 5A constant does not even heat them at all.

hello Tom I have never tried one BTS7690, sooner or later I will try but now I have too many things to finish .. even the plasma
I saw the video of the things you did, you don't lack ideas.

But i do lack time, and sometimes more parts to play with!

Sorry it is BTS7960, my bad.
Today i used the Mesa 6i25 to do some more testing, the difference in stability of a servo loop closed in Linuxcnc between parallel port and a Mesa card is astonishing. With parallel there was always a bit of a whine from the motor and the rotation was a bit noisy, with Mesa it is silent.
Well one direction is silent for now, need some more tuning and some checking with PCW as i have requested from him a firmware for mode 1 PWM, but these drives need the mode 2 PWM, or UP and DOWN PWM. I did set it in hal as mode 2 and it does work with that issue that one direction is not stable as the other, might be due to using the DIR pin to output PWM ????
Leme go ask PCW while you watch the short video:

Got the scopes out, it is due to dir pin remaining a dir pin as it is programmed in firmware.
Cr@p, i have to bother PCW again. Not good from my side, should have done some test before asking for custom firmware. I owe him a lot of beers.
The main thing is, those drives are nice for up to 200W motors, and i have some collecting dust.