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counterbore
[ koun-ter-bawr, -bohr; koun-ter-bawr, -bohr ]
noun
- a tool for enlarging a drilled hole for a portion of its length, as to permit sinking a screw head.
- the portion of the hole so enlarged.
verb (used with object)
counterbored, counterboring.
- to enlarge (a drilled hole) along part of the length of the hole by drilling with a bit having a greater diameter.
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Other ˜yÐÄvlog Forms
- ³¦´Ç³Ü²Ôt±ð°ù·²ú´Ç°ùİù noun
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˜yÐÄvlog History and Origins
Origin of counterbore1
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Example Sentences
Examples have not been reviewed.
For enlarging a hole for a certain distance the counterbore is employed.
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A counterbore in the arbor hub provides clearance for the hub of the pulley which projects beyond the rim on one side.
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If taken off at all it must be pulled, for the dowel-pins, key and counterbore are close fits.
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When the cannon is loaded, a small quantity of powder is placed in the counterbore, and the spark between C and E ignites this and discharges the cannon.
From
For counterboring small holes or for facing the metal around their ends, the form of counterbore shown in Fig.
From
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