Um, no it doesn't Marcus. I do agree that in more expensive products you may have extra processes, thus create that extra time discussed as to why a product may be more expensive as I mentioned but not tolerance, that isn't a time issue to a CNC..I like your maths but its on assumptions that arn't correct when discussing tolerance, on processes though your maths is correct no doubt..Lets look at a single say bore chamber in a compressor..You put in in the CNC and push a big green button..Lets say 2-3 mm is left on that bore through the casting process..To create a tolerance of say 0.02 mm (about a thou) though lets assume takes 3 cuts..One cut is the roughing cut and takes 2.6 mm, the machinist would have likely programmed 2 finishing cuts of about 0.2mm each to ensure no flex in the boring bar after the heavier cut..lets say those three cuts takes the CNC 1 minute to achieve..Any tolerance within o.1 range (about 4 thou) would still only take 3 cuts though the two finishing cuts may be 0.18 mm or so instead and also be 1 minute to achieve..The feed rate would also be the same, cut size practically the same and the amount of cuts the same so no difference in the aspect of tolerance or that extra 5 seconds you mention...but to be fair, different castings/models may require more cuts, but some I think are assuming they use say that same bore chamber casting for an expensive product as they do a cheaper range but the tolerance is different.. That is purely wrong..Tolerances are created so things actually work and fit together LOL, especially in a compression chamber...
Besides quality of the alloy, internal/external parts, amount of processes or castings much of the higher costs come from the need to produce expensive tooling for a new product or range, the more processing the more tooling needs are required..When it costs 80-100,000 dollars for one die to designed and machined up for the casting (In which maybe up to 10 different dies may be produced for different parts/casting needs of the compressor) and machines to be made/set up to then machine the required processes, there can be millions invested so that cost has to be re-couped by higher costs on the product, if not you would have fixed prices and we see thats not true, as more are sold the costs come down and thats not due to it being machined any differently from one month to the next..Its because they have recouped the initial costs..
We assume things like say TV's, even airbrushes are all from the same factory but have different badges put on..They may indeed be from the same factory but each will be on a different line in that factory due to different processing needs each model may have as there will be differences in a Samsung TV compared to a Hisong TV...Not just the badge or name as many assume..Similar parts or electronic boards may be used within for sure, but some may be of better quality, better capacitors, extra features etc thus the higher pricings...Just like compressors.
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