Cheap Laserengraver using 28BYJ-48
Cheap Laserengraver using 28BYJ-48
3D
Published 2020-04-18T13:30:13+00:00
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! WARNING !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Laser is very dangerous! NEVER use it without safety protection!! Even a cheap 250mW Laser can harm your eyes badly!!!
If you dont have any safetygoggles, use at least your phone´s camera (which is replaceable, not like your eyes...) for checking and focusing. But be also aware that this could damage the camerachip !!
I´m not responsible for any damage!
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Try to print one of the smaller parts to see if the inner diameters will fit to your printer. I made them 0.5mm bigger so they will fit to my Geeetech A30!
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I tried to build a cheap Laserengraver out of old DVD drives using parts here from Thingiverse. Since that didn't worked out like expected, i decided to design my own one, using parts that i had laying around.
Long story short :-) Here are the Parts you will need:
2x Timingbelt G2.5T (1m in total is more than enough)
4x Bearings 625Z
2x 28BYJ-48 12V Stepper motors (modifyied like in the description: )
3x Screws M3x10
4x Smooted Rods (you can use every length, just 2 pairs per Axis)
6x LM8UU Bearings
1x M8 Rod (length depending on the Rods youre using, You will need 2 for the Y-Axis)
1x M6 Rod (length depending on the Rods youre using. You will need 1 for the X-Axis)
4x Bolts M6
8x Bolts M8
Last but not least, any kind of GRBL Controller (Uno Shiel, old 3D Printer Hardware....https://github.com/grbl/grbl)
You have to modify the Stepper motors from Unipolar to Bipolar, that we can use them with normal stepper drivers. This is less work, than it sounds. Just open the blue Cover on the backside of the stepper, and scratch the trace on the PCB between the two conacts in the middle (on the red wire) and finally remove the red wire. Now you have a normal Bipolar stepper motor that you can use with every stepper driver
Set the Current of the stepper drivers to something around 0,09V or 0,08V to get a smooth working engraver without overheating. Dont tighten the Belts too much, otherwise the cheap gearbox inside will be damaged (i killed 5 motors with to tight belts, before i found out that this is a bigger problem)
The X-Axis can be tighten by the M6 rod in the middle ( i made the holes long enough)
Video of the working Laser in original Speed:
https://youtu.be/H9AmGd_vd2k
| Date published | 18/04/2020 |