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Old 11-10-2009, 05:55 AM
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Back Tacking

I'm wondering if there are two acceptable methods to back tacking. I have this new juki dnu-1541 machine that I've been practicing on and I'm getting fairly decent at pedal modulation (clutch motor) and sewing control. My problem is that I end up sewing a few too many stiches at the very beginning and I lose the opportunity to back tack because I've gone too far in the fabric. I find that I actually have more control on the machine when I don't have to worry about back tacking at all. I'm sure a servo motor would solve the problem all together, but at this point, I would like to work 'with the machine' rather than 'around the machine'.

So I'm wondering if a possible back tacking alternative would be to put the needle approximately 1/4" into the fabric, hold the reverse lever down, then release when the needle comes to the end, and finally continuing on sewing the piece?

As opposed to starting the machine from the very end, sewing a few stitches, reversing, and finally sewing the rest of the piece.

Are either methods acceptable?

Thanks again.

Doug

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Old 11-10-2009, 07:03 AM
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Yes, you can start the machine in reverse, but there again, you're working around the machine instead of working with the machine, and you're creating the possibility of a bigger problem. If you start in reverse and go too far you could jam the machine. If you ever get thread caught under the bobbin case it will be much worse than back stitching a little too far. It's not a difficult repair, but it is delicate and time consuming to remove the bobbin case and clear the jam. If the machine is a little too fast for you, and you don't want to get a servo motor, put a smaller pulley on the clutch motor until you have it mastered, and then you can change back if you want too. If you do that, you will need a longer belt, but belts and pulleys are cheap and available at the local hardware store.

I sew every day for a living. I changed all 3 of my machines over to servo motors. I had no problems with the clutch motors, but for precise sewing why worry about the machine when you can concentrate solely on what you're sewing? I can set my servos to slowly sew one stitch at a time with the foot pedal full on, or anything in between. I rarely ever change speeds, but it's nice to know that I have that option. Also, not having to listen to those clutch motors running all day was more than worth it to me to change.
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Old 11-10-2009, 08:02 AM
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Quote:
Originally Posted by DanTwoLakes
Yes, you can start the machine in reverse, but there again, you're working around the machine instead of working with the machine, and you're creating the possibility of a bigger problem. If you start in reverse and go too far you could jam the machine. If you ever get thread caught under the bobbin case it will be much worse than back stitching a little too far. It's not a difficult repair, but it is delicate and time consuming to remove the bobbin case and clear the jam. If the machine is a little too fast for you, and you don't want to get a servo motor, put a smaller pulley on the clutch motor until you have it mastered, and then you can change back if you want too. If you do that, you will need a longer belt, but belts and pulleys are cheap and available at the local hardware store.

I sew every day for a living. I changed all 3 of my machines over to servo motors. I had no problems with the clutch motors, but for precise sewing why worry about the machine when you can concentrate solely on what you're sewing? I can set my servos to slowly sew one stitch at a time with the foot pedal full on, or anything in between. I rarely ever change speeds, but it's nice to know that I have that option. Also, not having to listen to those clutch motors running all day was more than worth it to me to change.
Good points. I have pretty good control but it's just usually the intial start that I have to modulate at times. I went out and tried what I proposed above this morning before work and it seemed to work fairly well. I may go buy a smaller pulley for kicks and see how that works out. Thanks for the suggestion.

Doug
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Old 11-10-2009, 09:00 PM
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I went out today and purchased a new pulley about 1.25 - 1.5" inside diameter or so. The pulley that came off was 2.5" inside diameter. The pulley has slowed the machine down quite a bit and allowed me to gain more control on the initial start.

While I was at it, I brought out router speed control box that I had and tested it on the sewing machine. These boxes work with brush type AC motors. I was able to further slow the machine down if need be with that device. I don't think I'll need it at this point, but interesting nonetheless.

Doug
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Old 11-11-2009, 12:18 AM
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The motor on your sewing machine is not an AC brush type motor, it is meant to run at full speed. If you run that motor at slow speeds for any length of time, it won't be able to cool itself and you will burn it out. To run an AC motor at slow speeds you need an inverter type speed control, not a router variable speed control.
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