Guys... this puzzle has been launched also on the other side/site. Please don't let happen they solve it before we do! Here is a summary of what we know. (They do know the same) Up to us to be the first!
Two companies make simple flat drive belts for the same type of machines. (no multi-vee or multi-rib). A belt is produced from a long 'strip' from which the ends are put together with a weld. The production speed are the same and both companies use identical materials and manufacturing processes - speaking of temperature and use of liquid - except for one small thing: the machines that produce them are slightly different. In fact they are identical machines in every respect including age & technology but a setting on one has been altered. That modification can be done before the belt producing machine leaves the factory, or after it has been delivered to the belt making company. Pushing (or turning) a switch on one machine makes a setting possible - whilst the production of the belt is happening - that alters the weld, which is nevertheless identical in strength on both belts. Pushing (or turning) the switch does a one time change in the production process, that doesn't affect the speed or the pressure, but the rotation direction of the belt that is under construction in the machine, which results in a structural change. That 'change' affects an external pattern that has an influence on the friction of the belt. Due to this change, the difference between the two belts is most definitely 'viewable' by normal human eye in bright sunlight (and we don't mean the cleaning product). The changed pattern has nothing to do with nobbles or zig-zag, but twisting is involved. Apart from that, the belts are exactly the same speaking of density, thickness, color, shape, age, profile, surface, weight and chemical structure. Nevertheless, one would be able to tell them apart by feel - although sight would be a lot quicker - and the weld is not the only place where the difference can be felt.. They are all delivered to the end user in perfect condition.The end user's machines could be slightly modified to take into account the difference in the belts but they can be used on the same machine - eventually not at the same time - but in the same conditions speaking of temperature, air pressure, humidity, etc... and installed the same way speaking of tension and direction. But!... with the same amount of usage on the end users machines, one belt - that is not reversible - lasts almost twice as long in terms of operational usage - meaning the normal one wears out faster due to friction and tension from stopping and starting and load leading to stretching and breakages - measured using the same time units... Why? This type of belt already exists for many years - it was very common on car fan belts at one time - and Sherlocxs has seen this type of belt in use himself. The applied technique that differs the two belts from each other is also used in other domains, and even so for a longer lasting purpose. He also pretends a seven years old child has the knowledge to solve this puzzle. Nevertheless, he is expecting howls of protest about the answer, but claims this to be 'empirically' correct.
i bet the 75wrz$ is already down to negative huh? this thread already had 10pages.. i really wish to answer but i wanna read every post first..