pogo

Thanks very much. The problem I've been having is excessive fraying of the bottom (unbonded) thread. It seems the message is clear: ante up for another cone of bonded to reload my bobbins and forget the unbonded cone I have.

I'm guessing this question has been asked and answered before but I can't find it, so if anyone could point me to it I'd appreciate it. I'm trying to understand the difference between bonded and non-bonded polyester, and which is best to use in a compound feed machine. I'm running bonded in the needle and unbonded in the bobbin ( because I only have one cone of each) and every so often I get a bird's nest in the lower thread. I'm wondering if it has anything to do with the bonded/nonbonded issue. Thanks

Hello, I'm a nubie who's been lurking here soaking up much incredibly valuable info about the mysteries of industrial sewing machines. I recently acquired a Brother LS2-B837 that seems to be in pretty good condition. It was owned by a man who had a canvas business, so it has seen regular use until its owner retired a few years ago. Since then, it's pretty much been unused. I gave it a good cleaning to remove as much of the varnish and stuck-on lint that I could get off from the underside. Then I oiled it and made a few test runs. It worked pretty well until I changed the bobbin thread and realized I had no idea what I was doing. The bird's nest I got when I tried to sew reminded me. I have almost no experience with full-blooded industrial machines. I do have a Singer 20U73 which comes close, but still falls short of the category. I tried to download a manual from Brother but their manual is really for the LS2-B837-300A, a variant with a thread cutter, synchronizer, and other control features. I have some basic questions the manual doesn't cover--probably because Brother assumes anybody buying one of these machines already knows the answers. I thought someone here might be able and willing to offer some advice. My questions (so far) are: 1. How do I set the lower (bobbin) tension? 2. What it the correct procedure for loading a bobbin (direction of rotation, what should I do with the tail, etc.)? 3. How can I check the machine's timing to be sure it's right or needs adjustment? 4. How do I put oil into the reservoir that lubricates the hook? How much? 5. How much oil should I put into the upper reservoir? 6. What kind of oil should I use? Many thanks. I appreciate anything anyone can offer.