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Old 07-09-2007, 11:44 PM
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Barry.M Barry.M is offline
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Sewing Machine Troubleshooting ?.

G'day all.

I have been following along with the Truck reupholstery thread and have been attempting to get my skills to a level where I'm ready to have a go with our F350 seat.

I bought a used Mitsubishi LU2 4410 a couple of months ago and have been practicing on and off with exercises from Don Taylors Upholstery book, including making the stadium cushion........a disaster I might add.

Now I'm not too good with the technical names for sewing machine parts, so please put me straight.

A problem has only just arisen with the machine the last time I used it last weekend. When sewing welt on vinyl (I'm not using a welt foot as I don't have one) the machine has just started cutting the thread on the needle. I'm using a Polyester thread (16 oz?.) that came with the machine. It cuts through a strand at a time, then the thread bunches up on the needle and finally breaks.
When this happens it sometimes drops a stitch. It took quite a few test runs to actually see what was going on. Bobbin thread was also bunching up, but it appears that the problem starts at the needle.

It sews OK on flat items i.e. french seams, flat fell seams etc., just doesn't like sewing welt anymore.

I have had a close look at the "needle bar" , i.e. the bar which the needle passes through and presses against the material. That bar appears to have a nick in it from, I'm guessing the needle has hit it. I have smoothed it out with a fine diamond file but haven't tried the machine again.

I'm also guessing that sewing the welt is perhaps pushing the needle bar a bit and pinching the thread on the side it passes through the needle ?. Is this a possibility ?. What else should I be looking at ?.

Finally the Mitsubishi Instruction manual is VERY basic at best. It doesn't have the error codes or anything that are displayed on the readout for troubleshooting. Anybody here got one of these machines ?.

Thanks for your time..........Barry.
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