whats the need for tolerances in manufacturing?

Answer 1

If by tolerance, you mean fault tolerance then here is my answer.

Fault tolerance and load balancing usually come hand in hand.
A common method of balancing HTTP requests over the cluster is to use a hardware device designed specifically for this task. Such hardware Web Controllers can usually scale into much higher loads (simultaneous user connections, request routing) than pure software solutions. Their usage, combined with software load balancing and fault tolerance, is highly recommended for large-scale/heavy load application systems. Unlike the DNS based solution, such products are usually HTTP session aware and will always redirect the session to the same server in the cluster.

For fault tolerance a web controller can detect replica failure, and automatically send future requests to a different replica. A Web Controller also can use information in the request header to determine where to send a request. Some Web controllers also support hardware HTTP/SSL accelerators to improve performance.

Answer 2

I'm not sure why this question is in this category, but I'll give it a shot.

Tolerances are a measure of how much a part can be over or under the specified size. The engineer will say that a part should be 1 inch thick, for example, but can be five thousands of an inch over or under that size. Since it is difficult to make every piece exactly the same size every time when you're making hundreds or thousands or millions of them, this gives the manufacturer a little bit of leeway in the manufacturing process.

Answer 3

Since nothing is truly perfect there has to be a limit on how "imperfect" something can be. Tolerance is especially important when multiple parts are going to be used in an assembled finished product. If you run something out of tolerance it may not fit with the other Pieces of the finished assembly that are within allowable tolerance. Even the instrument used to measure something is not perfect, a typical dial caliper has a tolerance of +/- .001" so if you have something that needs to be within .0005" you can't use the caliper to measure it because the caliper could already be inaccurate by +/- .001".

Answer 4

it would be nearly impossible to produce items exactly the same in reasonable time, thats why you set a realistisc standard that people would buy, the sheer cost of trying to produce items the same (to the molecule) would be untenable. I recently over-clocked my graphics card with rivatuner and it states that no GPU is exactly the same and these(GPUs) are microchips produced by the most advanced manufacturing processes around. If you were producing teddy bears of something do you think the customer would notice or even care about minute details such as 2g more stuffing?? its down to cost and how much they can get away with.

Answer 5

Because nothing is 100% perfect and we need to accept tolerances because of this fact.
Hope this helps.

Answer 6

Why? You're asking why? I have a toaster without any slots, would you like to buy it. I also have a car with four different size tires, runs slanted but well.