Absolute vs. Quadrature Encoders 

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i like that you took the time to make the big easy thumbwheels instead of having a nut or a setscrew to fiddle with .. little extra time at the beginning to make life easier later on is a good thing

Awesome video ! Impressive workshop and equipment !

Where did you bought the eyebolts that are attached to the rods ? is your delta robot for comercial applications ? is your robot open source ? where can I find more information about your bot?

Awesome. I dig the encoder setup. Question, is there something you are going to use the motor outputs on the back of the motors for? I remember in a previous video you had mentioned you purchased those specifically for motion measurement. Is the current encoder method different out of necessity because you have a gearbox?

Great video, and thankyou

Very nice work. I hear your intelligence.

just one thing I don't think that calipers have Absolute Encoders because the same model was teardown by AvE and the moment battery is removed it "forget" and needs re-zeroing best way to test is just remove the battery and put it back in (do wait for caps discharging ) if it remembers then its Absolute

I think it's fair to say that these motors (and you even geared them down, geez!) have a ton of power. Do you think it could bowl like the pros?

Holy shit! You and I need to talk, this is the first time I'm stumbling across your videos looking for a deeper understanding of quadrature encoders and already I need to know what you're doing, why, and what you're using. I have a ton of questions. I have built a Delta/Kossel 3D printer and I want to make a 6 DOF motion platform and, from my understanding, it is not too dissimilar from these Delta robots. The main difference is, of course, we aim for precision by keeping the "effector" (at least that's what we call it with the 3D printers) parallel to the print surface or work table. In these systems, you try to eliminate "effector tilt" as much as possible. I'm a motion system, like a full motion flight simulator, you want that effector tilt...and it's upside down....And much heavier duty. What is that? A pick and place machine? It's gotta be, why else would you be using machine vision and that geometry machine? You and I should talk because I am extremely interested in the motor control and I don't fully understand encoders, more the programming of them than anything else, I have access to a lot of motors and a fully equipped machine shop....also...I am proficient in Autodesk Inventor HSM and am a CNC Machinist and have access to a bunch of hardware, electrical, and software engineers...but they don't really do robotics, which is so close to being crazy helpful 😆 liking the Mitutoyo and that thing looks awesome, you use Misumi for the extrusion? Those are some beefy motors, not cheap. Whatever you buildin.....it certainly looks like you know what you're doing, damn.

What an excellent video 📹

Is there a video or section where you describe how you join the ball joint linkage to the stepper motor linkage?

this might be a dumb question, but couldn't you just have used a potentiometer to see at what position it is? seems like a way cheaper option.

Hey Greg, looking great! Could you talk a bit about the press in hardware you are using?

I am not 100% sure, but I think the newer Mitutoyos still use incremental encoders. It is just that they never turn off. That is how it knows the position when you "turn it on". One way to test is to remove the battery and see if the caliper still knows the position.

Why did you choose to use these kind of encoders and not the regular encoders that are attached to the back of the motors?

Which encoders are you using??

More...thx

Why do you have 3 separate power supplies ?

Some addons.. quadrature encoders are called that, due to the pulse pattern they send out, quadrature pulses The "absolute" caliper, is only turning the LCD off.. not the encoder interface

Mmmm single board computers are getting stupid sexy!