Servo Motor Fine Tuning On Cb4500

[Ran]

Now that I've stitched a few holsters and a ton of scrap leather with my new CB4500, I'm working on fine-tuning the unit to better suit my needs. It took me a while to figure out how to make adjustments to the Servo Motor, but I think I finally got it. For a while, I had it stuck in reverse, but through trial and error I got it back going forward. Even though the pedal allows for variable speed, I found that if I slow the servo motor down, the pedal is much more forgiving and easier to 'finesse,' IMO. I suppose that if or when I get around to making belts, I'll want to speed the servo up some. But for now I like the maximum forward speed to be 'manageable' for this stitching machine neophyte..

[Wizcrafts]

Baby steps Randy. Learn to control the pedal with your toe and heel, at about 2700 RPM on the readout. This will yield ~3+ stitches per second top speed. As you become more skilled with the speed pedal and your foot positions, you can increase the motor to top speed and use your heel to keep it going slowly.

If you have a fancy stitching project that only needs slow speeds, reduce the motor speed to about 400 RPM. This will give you just under 1 stitch per second, with the pedal all the way down.

If the machine shakes at high speed, check the following settings:

• Alignment of the small reducer pulley to flywheel pulley (adjust sideways until directly in line);
  
• Alignment of the motor pulley to the large reducer pulley (adjust until inline);
  
• Lift of the alternating feet can be reduced to reduce shaking (raise movable crank on back to top position in slot for lower lift);
  
• Make sure that all nuts and bolts are as tight as possible, especially in pedestal assembly;
  
• Ensure that the floor is flat, or that any clearances under the rollers are compensated for zero slack.
  

[Sylvia]

. For a while, I had it stuck in reverse, but through trial and error I got it back going forward. Even though the pedal allows for variable speed, I found that if I slow the servo motor down, the pedal is much more forgiving and easier to 'finesse,' IMO.

I take it that your servo is a smart servo... right? I had mine stuck in reverse once. LOL that sure is disconcerting. Someone on the forum posted a MOD that looked pretty easy. Basically you attach a piece of paper with a gradient on the little arm that goes under the servo's sensor with double stick tape. I'll see if I can find it.

Ok here you go.

http://leatherworker.net/forum/index.php?showtopic=41483

Edited December 14, 2012 by Sylvia

[Ran]

Wiz and Sylvia....thanks for the tips.

Wiz...not sure what you mean by "....raise moveable crank on back to top position in slot for lower lift."

Sylvia...I found that post last night while doing a search. I think I might mess around with that idea.