Toyota embroidery machine - retrofit

Does the pot have hard stops?
How many turns does it take to hit those stops, if any?
How many degrees can it turn, if it does less than 1 turn?

www.alldatasheet.com/datasheet-pdf/view/862058/COPAL/JC30S.html

 

Is there another motion axis?
 

There is and it seems so be using the same potentiometer setup:

 

I think that if you scale the potentiometer voltage to position, and latch it in HAL (you can do this with a mux component, with the output wired to the input, and triggered by machine-is-on) and add that to the scaled encoder position from the motor encoder, then you would have a "good enough" absolute encoder emulator.
Then configure HOME_ABSOLUTE_ENCODER in the INI

You might want to set feed-hold when the needle is down, and release it when the needle is up...

thank you for your feedback.

indeed,

- it's a 0-5K ohm single turn potentiometer.
- on the 2 X and Y axes there are
- there is no limit switch.
-Since it's a single turn, I assume (not tried) that 1 turn = the distance the axis moves.

Thanks for the procedure, I was going to ask if it was possible to homing with a potentiometer.

Which reasoning do you think is best?

     - when homing, the motor runs until the potentionemetre is read at 1 ohm, then it looks for the incremental encoder index?

     - No homing, the encoder reads the potentiometer value directly?



I have a question about the needle motor control.

I have this electronic component, I suppose it's an encoder because of the markings next to the wires. A (Phase A) Z(Pulse) G(Ground) V(VCC) B ( Phase B )
Can you confirm this?

 

 

If yes, I suppose that I control the speed of the motor for embroidery and the position for changing the head (I have 5 heads).

However, I don't have a reference for this one. What test would allow me to know the number of pulses for this encoder?

For homing I would meassure how much the resistor value changes for one motor revolution. After that one can think of solutions. That said. It would be a good step to identify the ratios of the axis.

For the needle encoder. Plug it to a mesa card (first test with bench power supply and oscilloscope) and turn 10 revolutions....