counterbore - definitie. Wat is counterbore
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Wat (wie) is counterbore - definitie

FLAT-BOTTOMED HOLE ALLOWING A SCREW HEAD TO SIT FLUSH WITH A SURFACE, OR A TOOL FOR MAKING SUCH A HOLE
Counterboring; ⌴
  • Comparison of countersunk and counterbored holes.
  • Counterbore cutter marked '''E''

counterbore         
¦ noun
1. a drilled hole which has a wider section at the top.
2. a drill whose bit has a uniform smaller diameter near the tip, for drilling counterbores.
¦ verb drill a counterbore in.
Counterbore         
·vt To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.
II. Counterbore ·noun A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head.
III. Counterbore ·noun A kind of pin drill with the cutting edge or edges normal to the axis;
- used for enlarging a hole, or for forming a flat-bottomed recess at its mouth.

Wikipedia

Counterbore

A counterbore (symbol: ) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature. A counterbore hole is typically used when a fastener, such as a socket head cap screw or fillister head screw, is required to sit flush with or below the level of a workpiece's surface.

Whereas a counterbore is a flat-bottomed enlargement of a smaller coaxial hole, a countersink is a conical enlargement of such. A spotface often takes the form of a very shallow counterbore.

As mentioned above, the cutters that produce counterbores are often also called counterbores; sometimes, to avoid ambiguity, the term counterbore cutter is used instead.

The symbol is Unicode character U+2334 COUNTERBORE.