CB4500 reverse stitch bottom loops

[brmax]

Uwe

Hey thanks! for the video, it sure gives another perspective to look through. Besides i think to see that well the use of my hi-powr cheater glasses need found "again" As usual great work there

Floyd

[Zandeosaddles]

Wow!! you guys are awesome! Thanks so much for all the kind replies. I will work through each one carefully. I have a video up on my c ha on you tube. Search theus badenhorst and you will find it. Cb4500 reverse problem. Bob, thank you, I have played around with the tensions whichever way, problem persists. The theory about thread ctching on bobbin makes alot of sense but under close inspection there seems to be no snag that I can discern. see video. I will respond to other suggestions as I go through them. thanks again. This problem has been with us for 3 years. I have now taken up the challenge to sort it out. the reverse function on these machines is one of themost fabulous functions. have a great day all.

[Zandeosaddles]

Uwe, thanks so much, I believe this could be the issue here as well, I glad someone else has the same. It seemed everybody runs so smooth. Now the machiniacs must please help us with a fix... please.

 

Gigi, I have seen some improvement in the past with bonded thread, but I need to use all sorts of thread.

 

Constabulary, This is an option we may need other opinions on and maybe try out. Thanks!

 

[brmax]

Possibly in your test scenario ?

In the video on your channel i cannot see the top thread tensioner being used. And again maybe the testing or can you explain any tips with this setup. 

 

[LumpenDoodle2]

Again, out of curiosity, and probibly not pertaining to this problem, but.....

What would happen (if anything) to the timing of the machine, if the stitch length wasn't set properly when comparing the front stitch length to reverse stitch length.

As I said, just curious.........

[Zandeosaddles]

Hi brmax. The top thread tensioner just happens to be loose now as part of experimenting but stitches perfectly forward and adjusting it makes little difference to the problem in reverse.

Hi LumpenDoodle2. I don't know, but I set very carefully with stitch lever in forward on largest stitch setting. The machine stitches perfectly in the holes in reverse.

Hi Uwe. My thread does not seem to get caught where yours does. However:

In reverse the takeup lever picks up the thread tension spring sooner than it does in forward.

So it seems that a loop is left behind on every upstrokeof the take up lever. It feels lime something is catching the thread preventing the lever from pulling the thread in, however, I cannot see what it is when leather is in the machine.

 

 

[Zandeosaddles]

Gigi, just wondering, if hookwas a little behind, would that not affect forward stitch also?

[gigi]

I don't own this machine model, but I was just thinking there might be a 'play' between parts. How old is the machine? What was the stitch length lever position when you did the timing? I would try to set it in the middle when I do the timing to see if it solves the problem.

[mikesc]

I'd tend to be thinking along the same line as gigi, those loops ( and the fouling ) when sewing reverse at max stitch length, might be that the timing is just a gnat's smidgin retarded.

Edited May 27, 2017 by mikesc

[Uwe]

6 hours ago, Zandeosaddles said:

I have a video up on my c ha on you tube. Search theus badenhorst and you will find it.

You can copy and paste the web address of your video (in this case "https://www.youtube.com/watch?v=EDDnYJoJqH8" ) directly into a reply and it will be automatically embedded for easy access: