Question about Juki DDL-8700

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Problems when sewing over heavy jean hems

I use a Juki DDL-8700 for hemming jeans.  When I get to the inseam where the material is super thick, the needle often breaks, bends or the thread breaks. What should I do so this doesn't happen?

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  • Denim Doc Mar 29, 2008

    Sewing one thickness at a time wouldn't work as I'm sewing the hem of the jeans back on to the garment.  I need to sew around the opening and when I get to the inseam  the material is so dense that the machine often can't go over it without the problems I mentioned.  I don't know how to adjust the tension.  I know you can but which way do I adjust it, up or down?  I'm wondering if this machine isn't made for such thick material.  Thanks for trying to help.

  • Denim Doc Mar 31, 2008

    Rob, thanks for the tip.  I'll try that and see what happens.  I do sew very slowly over those areas, sometimes I just use the "wheel" instead of actually pressing down on the presser foot.
    I also found out that the machine I'm using is not made for heavy weight material.  It's a commercial one but not for heavy jeans.  Wonder why the company bought that one?  Obviously the ones in charge aren't very knowledgable about sewing.  
    I work for a small store that sells jeans, etc. and I do the hemming and small alterations.
    Thanks for you help.  I'll let you know what happens after I try your suggestion.

  • Joanna Sarff Sep 21, 2013

    I use the foot adapter for jeans (costs about $5 at JOanns. No more problems over bulky seams.

  • Anonymous Mar 19, 2014

    I don't know how to move the attachment up that you use for real thick sewing. I can't think of the name of it. It is down and I can't get my regular sewing attachments on.

  • Anonymous Mar 19, 2014

    juki 8700 thread brakes

  • Anonymous Mar 22, 2014

    can't hem blue jeans, want go over seam



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Needle too small u need size 21 needle. screw down the presser foot tension too. if u can't fix it use hand wheel and go thru heavy part by hand.

Posted on Feb 25, 2015

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Try (Jean a ma jig) sold in the notions department works for me every time.

Posted on Jul 22, 2008

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Are you using the correct type of needle? have a word with your needle supplier and explain the problem. Different threads and different thickness material need different top and bottom tension adjustments.
Can I suggest sew one thickness material at a time with tension adjustments for that thickness. Then change the tensions and do a batch of thicker material.

Posted on Mar 29, 2008

  • Peter Bradshaw Mar 30, 2008

    From your last comment, as I understand it the thicker areas of the material will not feed through the machine. If this is the case then it is possible the presser foot tension is to high. This is a **** it and see adjustment you need to end up with the presser foot at a pressure that will allow all the thicknesses you are sewing to feed.

    Sit in the normal sewing position, top left of the machine is a raised thick screw with a knurled knob on the top, this adjusts the presser foot tension. Clockwise = more pressure, anti-clockwise = less pressure.

    Try this, lower the presser foot and screw the adjuster clockwise now try lifting the presser foot with your fingers(make sure the power is OFF) eventually the pressure will be so much you will not be able to lift the presser foot. Screw the adjuster anti-clockwise and eventually you will feel the pressure lessen and the foot will be much easier to list.

    Ideally the presser foot should be fairly light on the material with just enough pressure to push it down onto the feed dogs.

    As I said before this is a **** it and see adjustment, eventually you will find a happy medium pressure.

    Another tip is to sew slowly over the thick areas.

    Best of luck



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Sewing jeans hems

You need a couple of things. One is to flatten the seams before you try to sew them. One of the best is to spread the hems on a wooden cutting board or simiilar smooth surface and beat the hems flat with a flat faced hammer. This is an official sewing hammer: and it will compress the fabric so it doesn't lift your presser foot up and let the tension off the top thread (which is what's causing your looping problem).

For crossing thick seams, you need a shim to keep the presser foot flat while sewing. These are usually called hump jumpers or jean-a-majigs, and are a couple of bucks. Or you can use a fold of fabric in the same way:

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If you raise the heigth of the presser foot too much, the tension control will open and the thread will not form a proper stitch - you will get a loopy stitch that will not hold.

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