Thanks for your complete answer
Your steppers are 2.5A? we use 76oz/in and they are 1.4A.
Yes, it has very high torque
NEMA-17 Bipolar 4-wire
[b]Step angle: 1.8°[/b]
Holding Torque: 4800g-cm @ 2.5 Amps
Motor Type Bipolar Stepper
Manufacturer Part Number 42BYGHW811
Step Angle 1.8°
Step Accuracy 5 %
[b]Holding Torque 4.8 kg·cm[/b]
Rated Torque 4.2 kg·cm
Maximum Speed (w/1063 Motor Controller) 600 RPM
Maximum Speed (w/1067 Motor Controller) 4688 RPM
Acceleration at Max Speed
(w/1067 Motor Controller) 1.4E+06 1/16 steps/sec²
Recommended Voltage 12 V DC
[b]Rated Current 2.5 A[/b]
Coil Resistance 1.3 Ω
Phase Inductance 1.8 mH
Shaft Diameter 5 mm
Mounting Plate Size NEMA - 17
Weight 332 g
Number of Leads 4
Wire Length 300 mm
The drv8825 can not handle more than 0.7V without heatsinks, any higher than that and you have to have a fan on them at all times, and I find they are not stable above about 1.05-1.1V even with aggressive cooling.
With fan it runs 40°C after 15minutes.
It looks good and can go very fast, but need a check.
You could watch my video (french language) if you want :)
In Parallel you need to *2 the voltage, in series you have to do nothing, that is why we switched to series. More power less heat (slightly lower top speed but we never come anywhere near this limitation).
I'm confusing, when I put two 1.5v battery in serie I have 3V. Are you sure? Is it because of internal cabling in motors?
There is nothing wrong with this, but if it is your first time, you really should stick to the way I do things. You can obviously switch at any time but if you have issues we can get you sorted out much much faster if you do things my way. Marlin, reptier host or the LCD, draw my picture, them make your own using estlcam. You would not believe but 90% of the issues are people going out on their own from the beginning. https://www.v1engineering.com/assembly/software/
Sure, if I get troubles, I will check forum and retry with your advices (great ones!!)
[youtube]MPCNC - présentation en français - YouTube