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seb58

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Reply with quote  #1 
Today, I decided to service the hand cranks on my 99k and 28k. the one I had on my 99k was a bit noisy but after cleaning it, it makes a sort of coffee grinder sound. 
After closer inspection it seems the problem comes from the upper gear (the one carrying the arm that goes between the spokes on the balance wheel).Its teeth are slightly worn. When I operate the hand crank in the opposite direction the sound is almost non existant, hence my guess about worn teeth. I imagine old grime made a protective cover on the geat teeth, thus muffling the sound.
I switched it to the 28k (the machine is noisier lol) but still the sound is annoying. 
I've tried coating the teeth of both gears with grease to no avail.
Is there anything to be done?
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Farmer John

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Reply with quote  #2 
Seb, , from your description it seems as though the involute gear tooth shape has worn, which causes the noise.  Or, if the gears are a loose fit on their shoulder bolt axle shafts through wear, proper gear mesh could be lost, which would also cause noise.  In that case, new shoulder screws could be made that would improve the gear mesh.
John
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seb58

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Reply with quote  #3 
Thank you for the input John. Actually, the lower gear is a bit wobbly, I've tried switching shoulder screws with the other hand crank but it is still as if a ultra thin washer is missing. I will try and put in some makeshift washer to test if it does anything to the noise...
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Farmer John

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Every time that I bought one of those China hand crank units, I would have to make new shoulder bolts for the gears, as sometimes the holes in the gears were .010 (.25mm) larger than the shoulder bolt.  One unit arrived with the shoulder bolt screws loose.  When I tightened up the bolts, the unit would only turn 1/2 turn before the gear teeth would lock up, as the teeth were not concentric with the central hole.   The crank handles are always a sloppy fit, with a .100" diameter pin through a .187" loop bent into the crank.   At least, they are cheap, so I buy them for the metal castings, knowing that I must rebuild them.
John
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seb58

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Reply with quote  #5 
That's what I read about repro hand crank... Mine are both Vintage Singer!
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