dfrensdorff Report post Posted July 31, 2018 Can one of you experts tell me why this is happening in my bobbin case. I hold thread tight when starting the stitch .... and sometimes this happens mid-stitch as it did in the photo .....Thanks for any and all advice. Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted August 1, 2018 Fisrt of all, your bobbin is smaller than the bobbin race. That allows it to wiggle around and shake thread loose. It also appears to be shorter than the top of its post, so it may flop up and down as well. All this unexpected slack may be causing your thread hangup. Unknown is if the timing is spot on, or retarded, or advanced. Make sure your check spring is holding the top thread taut until the needle goes through the leather. Quote Share this post Link to post Share on other sites
dfrensdorff Report post Posted August 1, 2018 Do I have the wrong bobbins? Most of the time this machine stitches flawlessly ... thanks for your reply! Quote Share this post Link to post Share on other sites
brmax Report post Posted August 1, 2018 Yes. The general diameter is 1.08” and the width or thickness is about .440” Good day Floyd Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted August 1, 2018 Your Juki LU uses Juki LU bobbins, which fill the bobbin basket with just enough clearance to spin freely. Further, there should be a star shaped anti-spin spring under the bobbin. Make sure you have threaded the top thread around the check spring and that it has clicked into the race around the spring. If you forget the check spring, the top thread can easily get caught in the bobbin post. Quote Share this post Link to post Share on other sites
dfrensdorff Report post Posted August 1, 2018 Thanks. I always hear the click on the top thread check spring ..... I’ll get new bobbins .... thanks again! Quote Share this post Link to post Share on other sites
Uwe Report post Posted August 1, 2018 I recommend ordering bobbins by part number. Don't trust the "Fits XYZ machines" statements (your bobbins "fit" but they're not right.) Get some original Juki bobbins to do your machine justice - how much can they cost, really? Quote Share this post Link to post Share on other sites
Matt S Report post Posted August 1, 2018 One online reference that I've found to be very reliable states that the Juki 1508 requires type U bobbins, if you are having trouble sourcing proper Juki bobbins. Quote Share this post Link to post Share on other sites
brmax Report post Posted August 1, 2018 I picked up another thread post, as theres a place for another on top. I found it handy and can stack 4 bobbins on it for the ready, this is why its there now. With one already loaded and 4 prewound, I will have plenty. Good day Floyd Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted August 1, 2018 BTW: The Juki U bobbins have twice the capacity of a standard 111 type bobbin and are even bigger than the M style used in many newer walking foot machines. Quote Share this post Link to post Share on other sites
Pintodeluxe Report post Posted August 1, 2018 Great answers. Just wanted to chime in that while the experts are answering a question for one person, many people learn and benefit from the conversation. Much appreciated. Quote Share this post Link to post Share on other sites
dfrensdorff Report post Posted August 1, 2018 Thanks all ..... I have a call into Bob at Toledo Sewing ..... Quote Share this post Link to post Share on other sites
dfrensdorff Report post Posted August 16, 2018 Thank you all! What a concept ..... get the correct size bobbin and all is good!! Bob from Toledo Sewing took care of business!! Quote Share this post Link to post Share on other sites
