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Studying NC Welding and fabrication
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<blockquote data-quote="binky" data-source="post: 452479" data-attributes="member: 490"><p>well past my apprentice days, but rough answers are along the following lines:-</p><p></p><p>1/ If you measure from a single fix point it avoids compound errors. Every time you measure a dimension, there will be a small error (how small depends on accuracy of the measuring device), so if you measure, for example, 10mm, then from that point measure another 10mm, and repeat 10 times and the error each time is 0.1mm, then 10 x 0.1mm gives a tolerance band of + or - 1mm. If you measure from one fixed point the same 10mm spaces, then potential error remains as 0.1mm giving a tolerance band of +or - 0.1mm.</p><p></p><p>2/ part of answer is in the Zeus book (I am assuming they still give out the infamous Zeus book) which contains lots of standard limits and fits. These basically are short hand for tolerances, you may see such things as H5, S4 - it's all about measuring and producing work that will meet the designers specifications for size, shape, fit and function.</p><p></p><p>3/ Again all about conveying the above information in a standard format on a piece of paper (drawing) you can read. </p><p></p><p>Hope that is some use.</p></blockquote><p></p>
[QUOTE="binky, post: 452479, member: 490"] well past my apprentice days, but rough answers are along the following lines:- 1/ If you measure from a single fix point it avoids compound errors. Every time you measure a dimension, there will be a small error (how small depends on accuracy of the measuring device), so if you measure, for example, 10mm, then from that point measure another 10mm, and repeat 10 times and the error each time is 0.1mm, then 10 x 0.1mm gives a tolerance band of + or - 1mm. If you measure from one fixed point the same 10mm spaces, then potential error remains as 0.1mm giving a tolerance band of +or - 0.1mm. 2/ part of answer is in the Zeus book (I am assuming they still give out the infamous Zeus book) which contains lots of standard limits and fits. These basically are short hand for tolerances, you may see such things as H5, S4 - it's all about measuring and producing work that will meet the designers specifications for size, shape, fit and function. 3/ Again all about conveying the above information in a standard format on a piece of paper (drawing) you can read. Hope that is some use. [/QUOTE]
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