The puzzler got me thinking about flat fan belts. They are used today where ever ultra high speed and low friction are required. (They are the blades in bandsaws, for example.) Ever wonder about the contour of the pulley face, and what keeps the flat belt centered on the pulley? For the curious, t…

nickpang — "There's no way the mobius strip answer would work. The belt would not rotate around leaving the twist in one spot between pulleys, but the tiwst would rotate with the belt and go over the pulleys"And you know this how? Gut feel? Twisted belts were often used on old farm equipment, either…

What about the fact you are now turning the accessory backwards in the case of a water pump this would be boooogus

The accessory gets turned backwards with a Mobius twist in the belt? I don’t think this is the case. Maybe a misunderstanding about the nature of the Mobius half-twist. The Mobius half-twist is in the belt itself, it’s not giving a regular (non-Mobius) belt a twisted (figure 8) belt-path. Wi…

The mobious twist was all i could come up with,

I proposed a figure 8 solution and can’t understand why it wouldn’t work. I just verified it with 2 pencils and a flat rubber band. The belt would Be contacted on both sides and the pulleys are driven in the same direction. Can someone explain why they couldn’t manufacture the belt without makin…

@nickpang , the twist might move slightly over time but could never get beyond either of the pulleys so it would be a stable system. The odds are it would remain halfway between both pulleys since that is the position of least torsion and resistance. @Mechaniker ’s link mentions putting the twist on …

Gentlemen, Ladies, see the attached. [image] This was the norm intextile mills for a generation or more…much more. They were flat leather belts.

The solution to the German fan belt problem is wrong. First, assume that a belt wears thin until it fails. Let"s take for an example a belt which fails at 100 hours when it has worn to 50% of its original thickness. The belt is formed as a moebius loop and a point on one side is marked “A”. Aft…

Sloking: I think the puzzler assumes the cause of belt failure is due with surface wear, that it becomes too “slick” and doesn’t stick properly to the pulley, and not that the belt itself wears out and fails simply because it becomes too thin. You have a good point though.

RE the fan belt puzzler

The Show

Royroyroy February 12, 2012, 9:26pm 18

I should correct the last post. It was NOT a figure 8 that I proposed. Of course that would reverse the rotation of the pulleys. It was simply a half-twist of a straight belt, leaving one side in contact with the, say, top pulley, with the other side in contact with the bottom pulley. Any comments?

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RE the fan belt puzzler

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