The Sewing Place
Machine Talk => Sewing Machines => Topic started by: crafter on July 10, 2018, 19:23:27 PM
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My husband has recently replaced the motor but I am now having problems with it running too fast. Any comments?
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My husband has recently replaced the motor but I am now having problems with it running too fast. Any comments?
What sort of motor? Servo or clutch?
Servo: small, compact, silent; runs only when needed.
Clutch: monstrously large, can be noisy; run all the time
If it's a servo, there should be a control box that allows you to set the maximum speed.
My money would be on you needing to change the pulley or add a secondary one. This video may help:
https://youtu.be/JbHj8pmL8EU (https://youtu.be/JbHj8pmL8EU)
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Thanks for your reply, @Mr Twingo
It is a clutch motor. The machine is a 'Typical' machine, which is a Chinese knock off a Brother. I bought it new about 8 years old and I used it perfectly happily until the motor burnt out. That may have been down to the amount of heavy work it was doing. Upholstery and curtains and some leather work. I really didn't notice any different between it and the Brother I used to have so was quite happy with it.
When the motor went I did quite a lot of research on the web and found a company (in Manchester I think) who said they had the right motor for it. Mr Crafter is an engineer (although not of sewing machines) and didn't see a problem with replacing it after he spoke to the provider I had found.
But now it goes at two speeds, stop and wizzing. No variation for a slow start which makes it unusable.
Now that the football is over I can get him to have a look at the video, or does this just apply to a Servo motor?
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As it happens, I was working with a clutch motor today, with a Singer 96KSV7 that came from Saville Row. As with yours, it is hard to control and seems to have the same two speeds.
There are a couple of things you can try:
First, try to increase the range of motion available on the clutch. See this picture: https://photos.app.goo.gl/KSNq17q7REwzNNi39 (https://photos.app.goo.gl/KSNq17q7REwzNNi39) and tighten or loosen the nut.
Second, alter the length of the rods connecting the foot pedal to the clutch.
I think the first is the most likely fix.
Let me know how you it works out.
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Thanks so much for your advice, I will try to get him onto it tomorrow.
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Thanks for your help @MrTwingo but I would appear that nothing is working.
By adjusting the rods and the adjuster screw it seems that the arm only moves by a mm, maybe 2, to go from stop to full speed - nothing in between.
Do you think replacing the motor with a servo motor would do the trick?