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mechanical engineering - How are increasingly accurate machines made . . . For plenty of detail on building accurate machine tools from scratch, read the excellent and detailed "Foundations of Mechanical Accuracy" By Wayne R Moore It's an old book and there are plenty of copies around if you use your favourite web search engine The basic principles for increasing accuracy are lapping and comparison of surfaces
measurements - Stretching material accurately with a machine . . . This wont be super accurate but it'll work For something more accurate you're looking at something more like a load frame Most engineering universities will have a few of these (mechanical or civil departments) Very easy to use, but they take some set up time (a half hour ish)
machining - How can high-precision screw threads be made on a lathe . . . It seems like this method limits the accuracy of the machined threads to the accuracy of the leadscrew in the lathe I would like to know how one can machine threads of higher precision than the leadscrew of the lathe It seems that this is possible according to the section making accurate screws in this page, where it is written that:
Rule of Tens Ten to 1 Rule in Measurement and Inspection Regarding the 12 96 tolerance range because more precision is applied to the dimension, two decimal places, or 01mm precision, you need a measuring device 10x that precision to be accurate So a device with 001mm precision would be correct
How do you determine the accuracy of a measurement device? To determine the precision of instruments for which there isn't a more accurate device you compare it to identical copies of itself (or use physical reasoning) $\endgroup$ – Chris Mueller Commented Jan 19, 2016 at 12:57
From an engineering point of view what are the downsides of a too . . . A more accurate model of gathered data from a system may not be a better predictor of future behavior of a system The above image shows two models of some data The linear line is somewhat accurate on the training data (the points on the graph), and (one would expect) it will be somewhat accurate on the testing data (where the points are
machining - Appropriate finish type for a new lathe crossfeed . . . As this part is the lower half of the crossfeed assembly on the turret cutter, it has to be accurate, which is no problem for straightness and tolerance However, as ways and gibs have to be able to hold lubricant (so the parts don't just slide on each other and wear out), there must be a standard for surface finish that's preferable for this
Can crosshead movement be used to measure strain in tensile testing . . . It is usually not accurate or precise enough ; primarily because of movement between the jaws or what ever device hold the specimens and the specimen On metal samples , even an extensometer can make a little irregularity in the beginning of the strain curve as it "seats-in"
What instrument does a surveyor use to accurately find North? The obvious answer is a compass I have an old (1952) transit that has a compass which seems to be accurate to 15' However, that doesn't seem too incredibly accurate at all Furthermore, most modern digital theodolites I see don't appear to have a compass (correct me if I'm wrong) I'm curious how a surveyor actually finds north with high