Question about White Sewing Speedylock 1600 Mechanical Sewing Machine
734D Superlock --- always very reliable, but now it's skipping stitches. I had it in for repairs, but the tune-up didn't last. I have put two brand new needles in it, and followed the threading directions to the letter. Also tried adjusting the tensions. I am tryng this out on cotton fabric, well-loaded with sizing. Nothing seems to help. What is wrong?
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Posted on Jan 02, 2017
Make sure the chain stitch thread is threaded exactly as it should be, make doubly sure the thread comes off the bobbin vertically and runs through all eyes smoothly. Any faults in the threading causes extra tension at the needle despite what the tension is set on.
If this is not the cause then the needle depth and the looper timing needs checking.
Posted on Mar 30, 2008
you're in luck, I have the same model and manual, I can copy it and put it to you in a file and email it to you if you want.
Posted on Apr 26, 2008
Couple of things I could think of: tension disks need cleaning, there is a site that tells how to clean them, maybe 2 as I recall. Other thing is it is a much older serger, (I have one I am slowly working on to bring up to working level), so it could be that a tension spring internally has lost its tension. It might need a trip to the repair man if that is the case. Another thing is are you using correct needles for the machine? Have you changed them recently? Even new needles can be bad, so if you have to change three times to triple check it can be worth it.
Posted on Sep 09, 2008
SOURCE: skip stitch
The three most obvious causes (other than that of the machine possibly being slightly out of time) are:
1) Too small of a needle size - increase the size.
2) A needle that has a flaw / defect - change the needle.
3) Needle not inserted correctly, either not pushed all the way up into the needle bar, or not installed facing the correct place. On this machine, the small "scarf" in the needle (an indent just above the eye) shouldface the right side of the machine.
Posted on May 07, 2009
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