Durkopp cl 18 problems

[Wolfleather]

Hello,
I have a Durkopp cl 18 at home, I found this manual a while ago which is great but I couldn't find it complete anywhere on the web. Does anyone have it complete or any contact to the author?

And now a problem that I'm just not able to solve. My top thread is making an awfully small eyelet, so the hook is unable to catch it. I've tried different threads and needles (I still have the original needles). But no matter what I do the loop is just too small. I have a nagging suspicion that I did something wrong in the renovation. 

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[Constabulary]

Hard to tell what what is wrong w/o having the machine in front of me. The D. 18 is a very special patcher I once restored one but never touched one again. Maybe this thread and the video I have linked may help

 

[Tigweldor]

Here is another vid on how to thread the Dürkopp.

 

Here is another vid that shows exactly how the arm is supposed to grab the thread and wind it around the shuttle - the uploader´s machine has probs doing just that constantly in a proper way - seems to be your exact problem.

I would just enter the vid´s title in Youtube and try to contact the uploader how he fixed his problem.

My Heinrich Koch Colibri has the same operating function - but it works just fine and I am hesitant to screw with a functioning unit by taking it apart.

What is very important is : the needle has to be exactly placed in the needle holder, so when a loop is formed it can be grabbed by the hooked arm.

If the needle is just turned a smidgen the wrong way - the arm can not grab the loop.

You also want the needle on the bigger side for your thread size - if it is to tight, it will have probs forming a loop.

Too much top tension (especially on the take-up spring) is also not helping the formation of a proper loop.

 

Edited Monday at 10:24 PM by Tigweldor

[Wolfleather]

I have exactly the same problem as in the second video. I've been bothered by this monster for two months. Without the material it's not a problem and the loop picks up nicely, but when I put the material in the loop just gets too small. Aside from that it works beautifully, overall for being one of the first ones made (I have number 5347) so it's basically in perfect condition in terms of worn. I'm trying to hunt for information where I can and I'm still short on it. That's what I get for not buying a Singer 😄

[Tigweldor]

Have you tried moving the take-up spring one notch closer to the pivot point = less spring pressure on the arm due to less fulcrum/leverage ?