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Tools, Processes and Fabrication
Quick questions on Marking out and measuring explained: O-Level Design and Technology
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are common marking-out tools?Show answer
Choosing the right tool for the line, a square for right angles, a gauge for parallel lines, dividers for arcs, is part of accurate marking out.
What is cumulative error?Show answer
If measurements are taken from different edges, or each from the end of the previous mark, small errors accumulate (cumulative error) and the final part is well out. Measuring every dimension from the same datum avoids this, because each mark is independent of the others' errors. This is the main reason a datum matters.
What is not checking before cutting?Show answer
Errors found after cutting often cannot be fixed. Measure twice, cut once.
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