Measuring Machine Tools with Ball Bars
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چکیده
Every time we detect a part that is out of tolerance, the implication is that something went wrong in the machining process: either the operator made a mistake, or the machine tool did. A lot of the time, problems with the machine get blamed on the operator. Rather than expect the operator to compensate for every machine tool problem -at the expense of increased setup time and scrap -it makes more sense to quantitatively assess machine error through the process of characterization. Then the operator can either compensate more efficiently, or better yet, address the problem directly by adjusting the errors out of the machine. There's a big philosophical shift involved here: rather than gaging parts to detect problems, we gage the machine to prevent them. It's particularly important with CNC machines, where we expect the machine to do much of the work for us.
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