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| Q. |
At which part of the precision straight edge is generally lapped? |
| A. | edges only |
| B. | base only |
| C. | base and edges both |
| D. | all over the surface |
| Answer» A. edges only | |
| Explanation: straight edges are extremely useful for setting up machines such as planers. precision straight edges are hardened and lapped on the edges by a small radius, which makes a blunt knife edge straight to a few thousands of an mm. | |
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