Question about Sewing Machines
Tension adjustment don't work
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Posted on Jan 02, 2017
There are two tension adjustments, which should be done with a proper set of weight gauges - top and bottom thread tension should be carefully balanced to get the best stitch formation. It is best that you assume the top tension is correct and adjust the bobbin tension to match. Load the bobbin with thread of one colour and put a spool of the same thread but a different colour on the top. Thread-up the machine, load the bobbin and sew-off a satin-stitch on max width zig-zag. In this configuration, there should be a very small 'bead' of the top thread showing along each side of the satin-stitch on the underside of the material. If there's excessive top showing, the bobbin tension is too high and if none, the bobbin tension is too low. To adjust the tension, remove the bobbin case and you will see a spring around the edge with two screws through it. One of the screws holds the spring in place and the other adjusts the tension - this is furthest from the edge of the spring and is in a small 'cup' in the spring itself. To reduce tension, turn the screw VERY SLIGHTLY anticlockwise and to increase it turn it clockwise. Make very slight adjustments and re-check sewing-off the satin-stitch every time until you get the required thin line of top showing down each side of the stitch on the underside. Ideally this should be done with Mettler Metrosene thread, but as we're just balancing against the top tension, it shouldn't matter too much provided you use a good thread top and bottom.
Posted on Mar 12, 2012
Jimmy is absolutely right - the 820/830 are very difficult to set-up correctly and you need to find a properly trained Bernina tech to do the job if the machine is in need of servicing. One thing I would suggest, however, is thatyou play about with the spool holder to make sure that the thread is running smoothly into the machine in the first place. It is very sensitive to having any 'pre-tension' and I have found that, occasionally, on a 'marginal' machine, if you use a well-used spool of thread. some spools catch the thread as it is leaving the spool and creates a jerky tension before the thread even passes through the internal tension mechanism. Try varying the angle and height that the thread guide comes to the thread spool and see if that improves things at all. Also, just check the overall thread tension balance by using two colours of the same thread top and bobbin - the bobbin thread colour should only be seen below the material and the spool thread above. If there's an imbalance, so one thread is appearing alot on the opposite side of the material, you can try increasing/decreasing the bobbin tension using your universal tool (white handle). Open the bobbin door and put the notch of the tool on the pip above the bobbin holder and move it a couple of clicks to the right to increase the tension, just to see if this improves things at all. Your machine probably would benefit from a service anyway, but it's worth just checking this out first.
Posted on Aug 28, 2012
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