Hand Crank Discussion
01-08-2013, 12:29 PM
#41
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Thank you, I may take you up on that.
I am a big believer in Sun-Tzu and his concepts, so I will plan until I am reasonably sure of victory.
This drawing is the concept, now I just need to validate the concept against a number of machines, and then develop actual dimensions.
Fabrication should be the easy part.
When I get home tonight I can check the concept against my 28, 128, 66, 15-91, 201-2, and the White FR.
(I know the 15 and the 201 have bosses, but they might be worth checking against anyway)
I am a big believer in Sun-Tzu and his concepts, so I will plan until I am reasonably sure of victory.
This drawing is the concept, now I just need to validate the concept against a number of machines, and then develop actual dimensions.
Fabrication should be the easy part.
When I get home tonight I can check the concept against my 28, 128, 66, 15-91, 201-2, and the White FR.
(I know the 15 and the 201 have bosses, but they might be worth checking against anyway)
01-08-2013, 01:20 PM
#45
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Originally Posted by miriam
The Singer 306 and Singer 319 I have are two that I would love to HC but the boss is offset from center. Is there a way to make an extension for them?
Go ahead and shoot me a picture and I will add it to the "process".
01-08-2013, 01:24 PM
#46
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Originally Posted by makitmama
here is a vintage hand crank and a new one side by side. The new one does not have the protrusions on the base, and the 'leg' of the mounting bracket is longer.
Any chance of getting the variance on those two dimensions? The distance from the back of the unit to the end of support arm.
01-08-2013, 02:11 PM
#49
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Originally Posted by SteveH
I am planning to keep my thoughts mostly to myself until I have most of the details sorted out but I'll say that my idea includes inspiration from the "jackrabbit" (motor on spring-loaded base to contact treadles and run them as electrics) as well.
Nancy, can you shoot me a photo of the boss area on your New Home?
Ok the "jackrabbit" motor as I remember it, is basically a friction pulley motor, which my little New Home has. I can see your train of thought - make a HC that works similar to a friction pulley motor. If you did figure something like that out, it wouldn't matter what size the HW is or the spacing of the spokes of the hand wheel. Interesting. If you could come up with something like a friction pulley system, even a smooth non-spoked wheel could be hand cranked. Of course, you still have to figure out a way to attach the whole contraption to the machine!
Nancy
Last edited by BoJangles; 01-08-2013 at 02:15 PM.
01-08-2013, 02:29 PM
#50
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Originally Posted by BoJangles
I will get out to my little sewing machine museum and shoot a photo soon.
Ok the "jackrabbit" motor as I remember it, is basically a friction pulley motor, which my little New Home has. I can see your train of thought - make a HC that works similar to a friction pulley motor. If you did figure something like that out, it wouldn't matter what size the HW is or the spacing of the spokes of the hand wheel. Interesting. If you could come up with something like a friction pulley system, even a smooth non-spoked wheel could be hand cranked. Of course, you still have to figure out a way to attach the whole contraption to the machine!
Nancy
Ok the "jackrabbit" motor as I remember it, is basically a friction pulley motor, which my little New Home has. I can see your train of thought - make a HC that works similar to a friction pulley motor. If you did figure something like that out, it wouldn't matter what size the HW is or the spacing of the spokes of the hand wheel. Interesting. If you could come up with something like a friction pulley system, even a smooth non-spoked wheel could be hand cranked. Of course, you still have to figure out a way to attach the whole contraption to the machine!
Nancy
Last edited by miriam; 01-08-2013 at 02:33 PM.
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