I agree with Wesley Lee, in that a linear regulator is not the proper power source for your application.
The laser module I would like to connect:. CNC Shield v3 technical data and instructions:. A4988 step motor driver specifications:. Is this correct calculation or should I consider some other things? For two step motors (0.4A * 2) and 2.5A laser I suppose I need 3.3A and as step motors are 12V and they will act better with higher voltage, I will buy 24V. I'm thinking about buying 24V/5A power supply. Can it be also related to not enough current from power supply?Īnd also I'm thinking about connecting TTL/PWM laser diode with 12V/2.5A specifications, should I also consider this when calculating enough power supply? Or shouldn't I connect it to CNC shield, what is the best practice about this? What can be the reason for that? Does it means LM317 doesn't supply enough current? (I set it to 12V) Also A4988 doesn't heat at all, I suppose it should, can it be related?ģ- Sometimes motor vibrates too much even for single-axis movement. Is this normal behaviour? Does CNC shield makes it "ready" as receives GRBL commands?Ģ- When I click on "return home" on GRBL controller software, step motor turns for several times and then stops and I guess skips (doesn't turn shaft) with a weird sound. For example when I command to move it on X-axis, it seems it works well.ġ- When one motor steps, the other motor also starts to work and vibrates without turning. When I try to send commands with Universal Gcode Sender, step motors turning well for single-axis movements. I haven't done any setting with A4988's trimpot. I used LM317 power supply for powering CNC shield. 
I've installed GRBL 1.1 on Arduino Uno, connected A4988 drivers and two stepper motors (link to datasheet below).
I'm newbie about electronics and Arduino so sorry if I'm asking non-sense things. I'm trying to build a laser engraver/cnc router with Arduino Uno, CNC Shield v3, A4988 step motor drivers.
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