Drilling, Boring, Reaming, and Tapping: Differences Explained
Reaming is commonly used for holes with diameters less than 100 mm. When drilling larger holes (D ≥ 30 mm), it is common practice to pre-drill with a smaller drill bit (0.5 to 0.7 times the diameter of the hole) and then ream to the desired size, thereby improving the quality and efficiency of hole machining.
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