New Tech Motor and Needle Positioner Config

[jackalopes]

I recently installed a New Tech 750w brushless motor on my Consew 206RB-1 with a speed reducer. After getting the needle position synchronizer installed, I cannot for the life of me figure out how to get it to recognize when the needle is up or down. Does anyone have experience with this equipment? When I have the positioner turned on, there is no consistency as to where the needle stops, making it hard to figure out what is going on.

Edited February 13, 2021 by jackalopes

[Uwe]

Make sure the position sensor is firmly attached to the hand wheel and that the position sensor itself (the plastic housing) does not rotate.

If the wheel mounting adapter is loose, or the sensor collar that attaches to the adapter is loose, you’ll get random stopping points. Just check to make sure you can’t rotate the sensor collar against the hand wheel. Hold one try to rotate the other. If it rotates, things are loose.

Edited February 13, 2021 by Uwe

[DonInReno]

I have no experience with that motor, but synchronizers often don’t work well with speed reducers.   ... are there any that do work with a speed reducer?  I don’t know.

[jackalopes]

I double checked the mounting adapter and all is tight. Other machines come to mind, Techsew, do have both a speed reducer and a synchronizer that appears to work well. Maybe they use a much higher quality synchronizer?

[Uwe]

I missed the speed reducer detail.

It’s more of a function of the controller software. It will do only a certain number of motor revolutions trying to reach the target position before it gives up. It’s a safety feature, really. Each controller model is different, there’s no standard.

If you let up the pedal just before it reaches the target position, it may work just fine. If you let up just after it passed the target position, you may get some fixed distance from wherever you let up. 

Edited February 13, 2021 by Uwe

[Gregg From Keystone Sewing]

See below. Make sure Parameter N.4 is ON.  Usually from the factory this needs to be setup 1st.  

 

[jackalopes]

Thank you very much for the user manual Gregg! Parameter N.4 was set to on, yet I'm still not getting any kind of consistency on where the needle stops. Could you provide the generic settings that are required to have the needles stop in the down position?

[Techsew Ron]

On 2/13/2021 at 10:40 AM, DonInReno said:

I have no experience with that motor, but synchronizers often don’t work well with speed reducers.   ... are there any that do work with a speed reducer?  I don’t know.

It depends on the motor and the installation/setup.

Our machines shipped with automatic needle position system and speed reducer have no issues whatsoever. 

Edited February 15, 2021 by Techsew Ron

[jackalopes]

Just as an update, I was able to get the needle position sensor to work without the speed reducer. The motor and sensor that from Gold Star Tool must use a different type of sensor than that sold with the Techsew machines. I guess next time I'll have to check with the vendor directly to see if their motor and NPS actually work with a speed reducer.

[dikman]

4 hours ago, jackalopes said:

 I guess next time I'll have to check with the vendor directly to see if their motor and NPS actually work with a speed reducer.

Good luck with that! A sewing machine specialist place would probably know if their particular motors would work, but I doubt if many vendors who sell these generic servos would even know what a speed reducer is!!

Edited March 8, 2021 by dikman

[sbrownn]

On 2/13/2021 at 8:40 AM, DonInReno said:

I have no experience with that motor, but synchronizers often don’t work well with speed reducers.   ... are there any that do work with a speed reducer?  I don’t know.

The synchronizers work fine with speed reducers.  I have them on two machines.  Since the speed reducer is ahead of the synchronizer mounted on the handwheel and it works off of position it doesn't even know if there is a speed reducer.

[jackalopes]

14 minutes ago, sbrownn said:

The synchronizers work fine with speed reducers.  I have them on two machines.  Since the speed reducer is ahead of the synchronizer mounted on the handwheel and it works off of position it doesn't even know if there is a speed reducer.

From what I can tell, there are different ways to keep track of the needle position. One would be to only use a sensor that would keep a constant and absolute position of the needle, another way would be for the sensor to only to keep track of the needle every 360 or 180 degrees of rotation and compare that to where the motor position is.  The position sensor that I purchased only provides a position pulse every 180 degrees. Just my thought on why some systems would work and some do not.

Edited March 8, 2021 by jackalopes

[DonInReno]

3 hours ago, sbrownn said:

The synchronizers work fine with speed reducers.  I have them on two machines.  Since the speed reducer is ahead of the synchronizer mounted on the handwheel and it works off of position it doesn't even know if there is a speed reducer.

That’s great if most do work with reducers - I really don’t know - just repeating what a few people found and talked about in previous posts.    I should stop throwing away synchronizers and actually try one, but I sew so slow that the needle just stops when the gas pedal is released.   Lol

[sbrownn]

16 hours ago, DonInReno said:

That’s great if most do work with reducers - I really don’t know - just repeating what a few people found and talked about in previous posts.    I should stop throwing away synchronizers and actually try one, but I sew so slow that the needle just stops when the gas pedal is released.   Lol

I agree.  I have two synchronizers and don't actually use either one anymore.