I have the ACRO system with the BlackBox. I am using the NEMA 17 steppers 1.9 with 14 tooth pulleys. I would like to upgrade and was wondering if I can us a .9 stepper with a 16 tooth pulleys and belts.
Yes, just remember to set new steps per mm values in Grbl Settings and make sure its 3v/1.3A or higher motors. BlackBox is 1.2-1.3A minimum
Little more help maybe needed. I installed my .9 Steppers. These motors seems to be running warmer than the 1.9's My temps are 118 degrees to 125 degrees. Just wondering if this is to hot. I am using the blackbox. I have turned the voltage down. Is there anything else I should be looking at.
Did you spec them correctly? If they are low current motors, BlackBox has a 1.2-1.3A minimum (ideal for 1.7A motors, as you don't want to run motors at their max rating. You want to run it below) and up from there. Check your motor datasheets - if they are too low current they would not be a good match for a BlackBox C or F? Motors do run warm, but shouldnt be hot enough to burn your hand, melt insulation, warp the Acro plates, etc
Do you have any recommendations on where to get stepper motors i found a place on Amazon but not sure on amps. It says a 2a but not positive.
We have ours only in 1.8 deg. Amazon specs are hard to find for sure. The theoretical resolution doubling of 0.9deg motors are very impractical though - half the speed, and the frame is the bigger contributor to accuracy error anyway. Our standard Acro+BlackBox config has 1/8deg motors, with GT2 16T pulleys and 1/8th microstepping: Lets calculate the resolution 200 steps per rotation * 8 microsteps = 1600 microsteps per rotation 16T * 2mm pitch GT2 = 32mm per rotation 32mm / 1600 microsteps = 0.02mm already - you cannot measure that distance in the results of any laser engraving With 0.9deg motors, that doubles to 0.01mm (but half the maximum feedrate) The difference is 100% yes, but.... the difference between 0.01mm and 0.02mm is ONLY 0.01mm - is it worth the cost, effort, and loss of speed? Improving the mechanicals on the other hand: How to calculate V-Slot® deflection comes into play, and the acrylic plates which can flex quite a bit, lack of Eccentric spacers to perfectly adjust the wheels, etc makes the Acro a budget machine, and can benefit from upgrading on the mechanical front much more than in the drive system
