Pfaff 345 issues

[Karbo]

Greetings,

I’ve been trying to solve some issues for the past few days of thread entanglement and so far not so good. I’ve disassembled the bobin case up to the bobin case lever to make sure no thread was in between. Currently I’m using 134-35 #21 needles and #138 thread. In the second video, I removed the cover to show the needle to hook action.  I’m aware that this video is probably not enough to solve the problem but I’m willing to follow guidance and post more as needed.
 

Thank you for your time. 

 

[nejcek74]

Your timing is a little bit of (hook should be at the needle scarf when already on the way up, distance is definde in the manual) and probably the needle is too far from the hook (it should almost touch the needle, but not exactly, ca 0.1mm). I suggest you to find the engineering manual and follow it to time your machine.

Edited 5 hours ago by nejcek74

[Karbo]

26 minutes ago, nejcek74 said:

Your timing is a little bit of (hook should be at the needle scarf when already on the way up, distance is definde in the manual) and probably the needle is too far from the hook (it should almost touch the needle, but not exactly, ca 0.1mm). I suggest you to find the engineering manual and follow it to time your machine.

Thanks for the reply, I’ll have to research on how to time this model…I’ve read something about the eccentric adjustment screws but not sure if that’s how to proceed. 

Edited 5 hours ago by Karbo

[AlZilla]

This post and the few that follow talk about timing a 545. Maybe it'll be helpful to you:

 

[Karbo]

1 hour ago, AlZilla said:

This post and the few that follow talk about timing a 545. Maybe it'll be helpful to you:

 

Thank you, that’s what I needed 

[friquant]

3 hours ago, Karbo said:

I’m aware that this video is probably not enough to solve the problem but I’m willing to follow guidance and post more as needed.

Nice job on the videos! Adequately slow, in focus, and that second was such a CLOSEUP!!! 🤩 

As the others have indicated, the hook timing needs to be retarded. In the first video, see the loop of thread that gets dragged around the bobbin the first time the hook grabs it? That loop is what gets pulled tight to form the next stitch, and the loop needs to be in front of the hook point in order to do so. Otherwise the hook will grab that loop on the hook's second time around and the machine will bind.

To fix, you retard the hook timing until that loop is safely 5-10mm ahead of the hook point when the hook comes around the second time. (Or you can set the hook timing according to factory specs---that will probably accomplish the same goal.) 😀