Why a small auger needs no guide but a large one does
A question on drilling, with three augers of different sizes
Below a short question Leonardo draws three T-handled augers of decreasing size standing on a board. He asks why the small auger bores its hole without a guide, while the large one requires that the hole first be widened for it two or three times. The lower half of the leaf is blank and heavily stained.
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Small versus large auger: the need for a pre-widened hole
Why does the small auger make its hole without a guide, while the large one requires that such a hole be widened for it two or three times? The question compares how augers of different diameters engage and cut into the wood.
Three T-handled augers of graded size
Three augers are drawn standing point-down on a board, arranged from largest to smallest, each with a cross handle at the top. They illustrate the comparison of drill sizes posed in the question.