No eBay APP ID and/or Cert ID defined in Kunena configurationI think that the way to do this is to use adaptive-feed to halt the fabric when the needle is down.
How do you know the needle position? The stepgen outputs a position. If you add homing for the spindle then you can use a custom HAL component to output the adaptive-feed ratio.
But how to home a spindle? Currently that's not built-in behaviour. But it could be part of your custom hal component
Have you seen the commercial sewing machine servos? They are surprisingly cheap, and have a rudimentary encoder:
as an example, Cheaper ones exist, and more expensive more powerful ones too.
I think I would be looking to use one of those, and then try to work out the adaptive feed from the needle-up signal and some cleverness in a HAL component.
The stepper should work, but the dedicated motors are a lot more powerful.
Tell us which way you want to go, and I think we can come up with something.
