Home Built CNC

[Jala2]

Thanks for your reply, I'm new to this Forum business, what's a PM?
The PSU is one bought from Amazon "https://www.amazon.co.uk/gp/product/B01DDX7J68/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1" I have 4 motors X Axis has a slave to A. The motors are wired directly to each TB6600 driver. The Motors are JK57HS56-2804-0, can't see how to paste in data sheet.
I'm using Mach3 and I did not change anything in Motor tuning for the new motors.



I went into advanced and found the add attachment clip

[JAZZCNC]

Ok first of all edit that last post and remove your number before you start getting strange phone calls from Hot breathers in middle of the night...Lol

PM stands for private message. If you click on my name near the union Jack you'll see a pop down box with send Private message option.

Looking at the Motor spec the inductance is low enough at 2.5Mh however I'm 99% sure your problem is the voltage. The larger motors require more volts to get the same speed as the smaller motors and you only have 24Vdc which isn't really enough for Nema 23 motors.
This means because you didn't change the motor tuning in Mach3 you are trying to get the same velocity as the old motors and the new motors can't acheive that speed so they are stalling.
If you lower the velocity in Mach motor tuning your stalling will stop.

However the correct solution is more Volts, Now however your drives become the bottle neck.? The TB6600 have a max voltage rating of 42Vdc but these drives are very flaky so you don't want to be running the voltage any where near this as they could blow up. I wouldn't be running these drives above 36Vdc.

So if you want to keep these drives then I'd up the voltage to 36Vdc. It will give you the speed back and should stop the stalling.

However if you want the best out of the motors then I'd replace the TB based drives with digital drives with minimum of 50Vdc running motors with 42-44Vdc. This will transform the machine. You'll get higher feed rates and much smoother motion.

Now regards the PSU then these are Regulated switch mode supplys and not really advisable for CNC use because of how the motors can send voltage/current back to drives/PSU when de-accelrating. They basiclly become dynamos and instead of using electricty they start creating it. These regulated supplys have built in safety circuits designed to stop this, so when they see it happen they shut down. For CNC you want unregulated PSU.

It will work, but if it starts chutting down for no reason this is why.