CSM-1000 Servo Motor Settings

[TomG]

Does someone have this motor and have it set up to sew really slow.  Can you share your settings with me?
Mine does sew pretty slow, but it's hard to do a single stitch. I feel I'm close, but just need a little tweek.
Also, does anyone experience it stitching a couple of stitches after you left up on the pedal? Usually ONLY within the firt couple of starts.
 

[brmax]

I think you may be experiencing the servo two stitch. Just when your trying to tap the pedal for a 1 stitch. Welcome to our world  

By chance do you recall the pulley diameter on the servo. In any case many members have them and will chime in. 

 

Good day

Floyd

[DonInReno]

Yes mine will keep running a little bit when it’s first turned on.

As to really slow sewing, you’ll have add a speed reducer, or get the smallest possible pulley for the servo and a larger handwheel.  

[Uwe]

You have my sympathies dealing with this abomination of a user interface on a servo motor. 

Here's the manual for the two-digit display model - good luck:

http://www.consew.com/Files/112347/InstructionManuals/CSM1000.pdf

500 RPM may well be the slowest this motor can spin. 

The initial running-on syndrome may have to do with the position sensor - especially if the actual position sensor is missing. The controller logic will keep spinning the motor after the pedal is released to wait for the signal that the handwheel is in the right position. If there is no signal (because the sensor is missing) the controller logic will give up after a few turns, and perhaps record the position sensor as missing, so it won't try again until you cycle power. There's usually a setting that tells the controller whether the position sensor is installed or not - make sure that setting reflects reality.

Installing a speed reducer pulley may also cause problems on some motors if the reduction is too strong. Some control logic systems only allow for certain number of motor revolutions to reach the desired handwheel position. The controller may  give up before that position is reached, even if the position sensor is installed correctly.

Edited August 4, 2018 by Uwe

[dikman]

You're right, Uwe, those instructions are particularly bad (even for a Chinese translation!). Yep, according to "the book" 500 rpm is the slowest it can be set. What's worse though is that you can't disable the needle positioner!! That is particularly poor design. The chances are that adding a speed reducer will throw the needle positioner out-of-wack, so to speak (it does on my particular servos). Best bet, as Don said, is a small motor pulley and replace the handwheel with a much larger pulley. This will give much lower speed, increased torque and shouldn't upset the needle positioner.

[DonInReno]

On 8/3/2018 at 8:39 PM, Uwe said:

The initial running-on syndrome may have to do with the position sensor - especially if the actual position sensor is missing. The controller logic will keep spinning the motor after the pedal is released to wait for the signal that the handwheel is in the right position. If there is no signal (because the sensor is missing) the controller logic will give up after a few turns, and perhaps record the position sensor as missing, so it won't try again until you cycle power.

That makes perfect sense! On mine it only happens when it’s first powered up.  

TomG,  As you know the lowest speeds are a challenge to regulate since the speed controller is pretty sensitive.  I retrofitted a different pedal so it takes two inches of toe movement to move through the entire speed range.  This would not be a good choice for production sewing, but it allows a nice relaxed foot movement with as much control as the servo is capable of.  While it allows better control, without a reducer the motor just doesn’t have the torque to smoothly sew at those slow speeds and there’s a lot of handwheel use starting and stopping stitch runs in heavy material.

Currently that motor is attached to a planetary reducer with a final reduction of 8:1 (8 turns of the motor turns the factory 111w155 handwheel once).  This is too much reduction for most purposes, but does allow the motor to be kept on 4000 rpms and provides between 1/2 stitch per second up to 500 stitches per minute.  Rarely does the handwheel get touched because jogging the pedal easily allows about 1/10th turns and stopping all the up or just past bottom becomes normal.

A 3:1 reducer combined with small servo pulley would be just about right with something like 6:1 final drive ratio would easily give 1 stitch per second.

For the price this motor is still a bargain.