Is there anyone who still uses 2D laser engraving machines? Full range of functions, both software and hardware (Part 1)

zhengjingwen

Is there anyone who still uses 2D laser engraving machines? Full range of functions, both software and hardware (Part 1) [Copy link]

I started by imitating the old CD-ROM drive of the great god to play with the writer, and see what functions can be achieved. If you are interested, do it with me. Seniors, please come in and give some advice. There are already many kinds of burners, so I will not introduce them in detail, but only talk about the key points. 1. The initial road: Three CD-ROM motors XYZ axis, Z axis is responsible for the pen. Hardware matching: Arduino motherboard + expansion board + 3 A4988, a very classic combination. The motherboard control power supply uses USB direct power supply 5V, and the stepper motor drive power supply uses an external power supply. I adjusted the voltage to about 8V, which is more suitable. 5V drives a single stepper motor. It is okay, but it is not enough to drive two or three together, so it is ideal to adjust it to 8V. At first, the printing motor heats up, and the current is too large to burn the motor easily. My experience is to adjust the small knob of 4988, and adjust the output current of each stepper motor to about 100mA. If it is too low, it may not be able to drive or lose steps. If it is too high, it will heat up too much. It is good to be enough. You can adjust it according to the situation of the motor. Generally, it does not exceed 200ma. For 4988 subdivision, I personally think that 1/2 subdivision is enough, that is, only short-circuit the short pin on the far left, so that the physical step position can be used without the need for high current control. And I have tested the subdivision again, only the first and second motors move, and the third and fourth motors do not move at all, so it is meaningless to subdivide again. (Personal understanding, if experts have different opinions, please leave a message to correct) I don’t think the wiring of stepper motors is that complicated. Just find the right two groups of motors, and the two connected ones are a group, such as 1-2, 3-4 lines, and the connection order is 1234, 2134, 1243, 2143. Any combination should be OK, as long as the same group is adjacent. Weld the wire row, and then plug it in forward or reverse according to the actual direction of the motor. (This is my personal understanding. If experts have different opinions, please leave a message to correct me.) This one is too small. It’s just a journey of exploration. I will make a larger size printer in the next part.