counterbore 的 2 个定义
- 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.
coun·ter·bored, coun·ter·bor·ing.
- to enlarge along part of the length of the hole by drilling with a bit having a greater diameter.
更多counterbore例句
- That it may always do this and yet leave sufficient clearance, the counterbore has been devised.
- The jaw end is counterbored out with a 45-degree counterbore to form a bearing for the forward end of the micrometer screw.
- For enlarging a hole for a certain distance the counterbore is employed.
- A counterbore in the arbor hub provides clearance for the hub of the pulley which projects beyond the rim on one side.
- For counterboring small holes or for facing the metal around their ends, the form of counterbore shown in Fig. 1746 is employed.