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Technical drawing, drafting or drawing, is the act and discipline of composing drawings that visually communicate how something functions or is constructed.

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Should I use the rounded values given on technical drawings or work at the highest reasonabl...

It's not about rounding, it's about tolerance. Specify tolerance. If you only write 1.00m then it will probably be interpreted as 1m +/- 0.005m. Don't make them guess.
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Meaning of quarter hole color fill in drawing

They are just identifiers for different types of holes. If the same symbol was used for every hole then every hole would need the size specified beside it if there was more than one type. With identif …
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