You've created a raster output scanner...this is what laser printers have used for decades...there's a lot of complexity to get things "tight" enough for real imaging...but you are on the right track.

And what about the focal lenght change? If you are using galvos the focal lenght will follow a curve. Professional systems are using special optics to compensate the change of the focal lenght.

Your video production is getting better! I'm excited to see where you go.

pretty good, I hope you get it working, seems like a useful thing for the public in general to have

so glad i discovered your channel. very cool stuff

Planing to build one, soon, using a rotating mirror to make laser patterns.... I will use this video as a reference, but I will use double sided mirror and brush-less motor, and planning to use a closed-looped control by feeding the rpm measured to an Arduino( which also served as the controlling unit) to control a pwm, controlling the speed of the motor to arrive at a target rpm.... thanks for the vid ... so lets get rotating.

Can' t wait for you to improve on the ender ECM machine. You rock !

very nice

photoresistor is quite slow, with a raise time in the 30 miliseconds range. diode is much better.

Dude, you gotta do a follow up for this video/work.

This is awesome. My friend makes galvos for a living so i came here to see what the hell she is talking about when she says galvo. Very cool stuff ya got here. I dont know anything about lasers, but i build drones. You ever heard of bidirectional d shot? Its an accurate rpm filter that goes forward and back, not sure if you could apply it to any of your work but just throwing it out there.

keep growing bro

You remind me of my 14year old self..(the mustach didn't really grow in till 16)

I´m sorry to say that, but you build no "Galvo" (Galvanometer) at all. A galvanometer is a coil hung up between two very strong magnets so it can rotate. Just like a DC motor, but only with one coil. When there is DC voltage applied, it will turn to a specific angle. To drive this, a pretty complex driver circuit is needed.

keep up the good work buddy

I always struggle to find what the actual max speed of the laser galvo in khz, will it Rotate mirror in khz or 16 Khz??

Ugggh... don't use your expensive soldering iron to make holes in plastic... use a cheapo, discarded one. KZfaq suggested me this video and I just liked and subscribed :-)

hi you should use a photo diode a light dependent resistor is slow so for fast rpm it will give noisy or average data

B DC motor isn't good choice because it's inertia and its brush contacts which can't move mirror at similar amplitude over time . You may countrect inertia but than Brush contact isn't Continuous and Smooth so it will create Unwanted Vibration .

All the best bro...

Hi! use a photo-diode instead. Photoresistors are way too slow

LDRs are the least useful sensors for time critical applications due to their extremely slow response. Turn at least to photodiodes or phototransistrors.

You need to use a photo DIODE. CDS photo resistors are terribly slow to react.

I tried this with red laser...the sine wave stay is my eyes to five week...use speaker to move mirror

I looked over at my time piece to discover it is indeed 4am. On the door. Synchronicity 😶

Cool!

Hi John; what exactly do you need a software controlled high voltage suppy for? Keep up the good work ;)

why not just use linear magnets?

Yeah, but it might not be as effective as the OEM Standard real Galvos in the industry lol😂.. But still that's quite a challenge you did right there 🙂...

So, basically you built a laser scanner with a DC motor and a stepper, and there is no galvo involved whatsoever. Galvo doesn't describe the complete system that directs your laser, galvo describes the way the mirrors. While this is a very interesting project, I was rather disappointed that you don't actually make a galvo with a DC motor. A galvo is an attenuator, rather than a motor. It is set in a specific position using a DC voltage. Same principle as how analogue meters work, hence the name 'galvanometer'

This is what i was looking for . what if i can use the CDROM Tray motor?

Could you turn it into a resin 3d printer?

Is there a link to the .STL file?

Oh shit, I should warn you, if you want to work with proper metal powders they use for this stuff, you NEED breathing protection. SLS is dangerous man...

Hey John, I'm trying to contact you, but can't access signal bc I don't have a smart phone. Is there another way to speak privately? I'm on matrix or you can email me.

WTF !!! ???