I don't want a paper scale, but I am sure there is something there I can use! Maybe even for this project, but for sure elsewhere!
https://www.aliexpress.com/item/1005004239312009.html for the AS5600This is fascinating John. On sooooo many levels.
It's odd that I never ran across this before. It's really cool.
Do you have a link to the Ali product page instead of a screen shot? I can't find that particular one. I like that it comes with the magnets.
I'm not at all sure that could be added to a compound though. Certainly nothing comes to mind. There is also the problem of precisely centering it. That's easy peasy on a spindle but dunno about a compound.
Must learn more......
Well some of this made sense to me John. Words like "The", "and", and "simply"It's generally 12 bits of resolution either as an analogue output or PWM. Often supplied as a digital value so you don't need to use an A/D on the uP that interfaces to it. So a simple Arduino could do this.
The best way to figure this all out is to use a rotary table to spin the magnet. Line up the sensor so it's within the measurement distance and then look at positioning accuracy and repeatability.
Just search using keywords like AS5048A and Youtube and arduino...
what about a cam degree wheel? Easy to get and fairly cheap.
Hate to make all this electronics seem irrelevant, but all you need is extra index marks on the compound base. Little scribed plates located every 45* around the circumference, then just a tiny bit of mental math.
As usual. The devil is in the details. Mostly mechanical and some wiring. The arduino libraries make the software pretty simple.
My machine has the degree markings on the compound and marks at 45 degrees on the cross slide base.
@Susquatch - would this concept work for you.
Microsteps are not accurate! To run a closed loop stepper system you have to treat the motor as a two phase drive that requires 200 phase transitions for one revolution. That's linked to the feedback mechanism. Doesn't really matter what type of feedback system.I played with the AS5600 a bit trying to make a closed loop stepper.
As far as accuracy it matched the microstep positions up to about 1000 steps/rev. After that there seemed to be a lot of differences, some were periodic while others look like noise.
Then I read an article informing me that micro steps are not particularly position accurate, so I don’t know if the differences were caused by the stepper or the AS5600.