Question about Sewing Machines
I have a jmb jmsm1020 overlocker - having problems setting tension to overlock edging to garments that I am making. What are the tension setting for standard overlocking?
Not sure whether tension is too loose - 4 threads being used on cotton fabric.
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Posted on Jan 02, 2017
You need to re-thread the serger.
Refer to the manual or open the front of the serger to see if the threading diagram is there.
With most sergers, you begin with raising the presser foot, then set the tensions to zero.
Begin the threading with the upper looper (curved looper), then the lower looper and the needles last.
Pull the thread under the presser foot and to the left side of the serger.
Set the tensions back to normal 4 - 5 usually.
Lower the presser foot and hold onto the threas tails as you stitch a chain. If the chain of the four threads is ok, you are ready to serge fabric.
Posted on Feb 21, 2010
When this happened to me, my grandson had changed the differential feed from N. If this doesn't help, cut your threads and rethread making sure the pressor foot is up. Then check your settings on the "Quick reference guide." This usually fixes the problem.
Posted on Aug 11, 2010
SOURCE: I am having trouble trying
Have you changed the needle(s) recently in your overlocker? I would put in a new sharp size 70 for satin, turn down the stitch length a fraction, put the blade about middle of its range, thread tensions all to 5 and test serge. Then adjust the two looper tensions until you get the thread wrapping around the smoothly but not bunching up the satin within the stitch. Also put your differential to zero for a start and see how the stitching looks.
It is easy to forget to change the needles in the overlocker because it is usually a bit of a fiddle but they will go dull. And remember to just loosen off the needle screw a little, enough to remove the old and insert the new, don't turn it all the way out as they come out and there is often a little ballbearing up in the needle housing that can drop out and get lost with some models.
Also most sergers the two needles sit at different heights so make sure you've got them both fully up into the housing and sitting right, tweezers are a big help with this, I usually pop the needles into the housing, then balance the needle points on the screwdriver blade and lift it right up until it is all the way up, then hold firmly with the tweezer and do up the needle enough to hold it. Then repeat with the 2nd needle, then go back and recheck the first one until they are both spot on. Then manually turn through one stitching sequence to ensure that the needles are not touching the loopers, if you hear any touch, go back and recheck the needle placement again.
If you are just neatening single layer edges I would just use a 3 thread on satin and take out the left needle so it doesn't leave holes. If you are seaming two layers, then go to four thread (both needles) but you may need to use a bit of differential if the seam is puckering a bit.
If you find that changing the needle makes no difference at all, and stitches are still not forming correctly then it is possible that the timing is out a bit and the machine would need a service to sort this out. Hope this helps you out.
Posted on Apr 18, 2011
Testimonial: "thanks heaps I will try all that"
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