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Farmer John

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Reply with quote  #1 
While I understand that there is more than one clutch make, mine is a Singer.  The clutch was jumpy and hard to control at low speed.  Disassembly is easy, only one nut and bolt to remove, the unit then sliding apart.  Just as an automobile clutch lining needs to be clean and dry, so should be this Singer clutch..It was not, however, with a thin film of heavy grease on the friction surfaces.  There is also a lot of lint in the clutch, and the open face ball bearings don't turn freely.  The bearing grease is almost black, and appears to have not been serviced in decades, if ever.  Cleaning begins...

Edit....smoothness and control have returned after the good cleaning and degreasing.
John
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Farmer John

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Reply with quote  #2 
Before the clutch overhaul, the machine would occasionally burst into full speed as the clutch grabbed.  While I can handle the high speed, I cannot handle the intense vibration that would shake everything off of the table, were it allowed to continue.  It was very severe in just that instant that it took to get my foot out of the clutch peddle.  No machine could endure that condition for very long without damage.  My handwheel is counterweighted and aligned on the mainshaft correctly.  I machined and installed a 4" aluminum pulley over the 2 5/8" pulley that is machined into the handwheel, without any modification to, or holes drilled into the original handwheel.  The reduced speed from 2200 to  1600 stitches per minute is completely without vibration and still 50% faster than any sm that I have.  Now, this beast is a pleasure to drive.
John
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ndnchf

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Reply with quote  #3 
I know there were several different motor/clutch setups used on 31-15s. I'm wondering if yours is the same as mine. I've not touched this one yet, but want to get into it soon.

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jpeg Clutch.jpg (68.47 KB, 4 views)


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Steve in Virginia

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Farmer John

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Reply with quote  #4 
Steve, Mine looks nothing like yours.
John
100_0282.JPG 

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ndnchf

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Reply with quote  #5 
Yep - very different. My machine dates to Sep 1945. I believe it's later than yours. A while back I picked another parts machine, and it had a huge separate clutch mechanism belt driven from a motor. It is a real beast. I wonder how many other variations there are.
Steve

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Steve in Virginia
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Farmer John

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Reply with quote  #6 
Steve, my 31-15 is from 1928.
John
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ndnchf

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Reply with quote  #7 
Is there any kind of instruction or service manual for the clutch motors? I have a 31-15 manual, but it says nothing about the clutch motor. I'm wondering what servicing it needs. I oiled up the machine and ran it a bit. The motor runs well and the clutch works smoothly.
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Steve in Virginia
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ndnchf

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Reply with quote  #8 
Looking closer at the clutch motor shows that the grease zirks at each end appear to feed the motor bearings. So I took a grease gun and gave each one a full pump. When I tested it, the motor was noticeably quieter. I also checked all the wiring and it's in good shape.

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jpeg Lftmtr.jpg (77.40 KB, 6 views)


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Steve in Virginia

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Farmer John

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Reply with quote  #9 
Looks like a single cylinder, spark ignition, air cooled unit to me, ha, ha.
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ndnchf

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Reply with quote  #10 
Quote:
Originally Posted by Farmer John
Looks like a single cylinder, spark ignition, air cooled unit to me, ha, ha.


It's actually better suited to the age of your machine. It's a 1928 Indian motorcycle engine ;-)

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Steve in Virginia
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Farmer John

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Reply with quote  #11 
ALL RIGHT !!
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