Servomotor - Speedreducer - Needlepositioning/EPS

[Pterytus]

You are right, this time-needed-to-slow-down issue came to my mind as well. Maybe the controller DOES learn the exact degrees of the machine and determines when to begin slowing down in order to stop at the desired position - which would make sense, although a little more sophisticated software-wise than just stopping at the signal. With my deliberately slow machine it would not make that much of a difference, I think.

Well, the sensor-chips inside the sensor-module Are 180° offset (see picture above). However, if the controller DOES learn the number of motor-revs needed to make one revolution at the machine, it actually COULD stop earlier or later. And you would want it the way you described and not exactly half a revolution offset.

The German manual to my JM-822 is not very helpful (baaaad translation and just a few words as description) but I think there is a menu item to adjust the TDC and BDC needle position. Up to now I did not dare to change these settings ;-)

But now that the NPS seems to work it might be worth a try.

By the way: Does any of you guys happen to have an ENGLISH manual for the Aerostar JM-822?

I think that might clarify some of the menu items - the combination of two bad translations should be better than just one, right? :-D

[dikman]

Pterytus, as I mentioned the "heel down" operation on mine is intermittent so not a lot of use. An NPS is doubtless great if you're doing high speed sewing but as Constabulary has re-iterated if you're slowing slowly then there is little to no benefit, and I think it's a safe bet that many on here sew their leather fairly slow. The whole idea behind fitting speed reducers is, after all, to try and tame the beast, so to speak.

As I said before it's been an interesting experiment so thanks for posting, it obviously works for some servos, just not mine.