Types of Holes
Countersink
- is a conical hole cut into a manufactured object, or
the cutter used to cut such a hole.
Allows the head of a countersunk
bolt or screw, when placed in the
hole, to sit flush with or below the
surface of the surrounding
material.
Counter bore - makes a flat-bottomed hole that might be used with a hex-headed cap screw
Pilot-Hole -
a smaller hole drilled into a material prior to a larger hole being drilled,
widening the hole to the desired width.
Pilot holes
are used when driving a screw. When a screw is driven into a material,
it can act as a wedge,
generating outward pressure which can
cause many materials to split. Drilling a small pilot hole into the material,
into which a screw is then driven, less 'wedging' takes place, thereby reducing
the likelihood of the material being
split.
Through-Hole - refers to a
hole that is reamed, drilled, milled etc., completely through the substrate. In
other words, a through hole is a hole that goes all the way through something.
Blind-Hole - a
hole that is reamed, drilled, or milled to a specified depth, thus without
breaking through to the other side of the work piece.
Countersink
- is a conical hole cut into a manufactured object, or
the cutter used to cut such a hole.
Allows the head of a countersunk
bolt or screw, when placed in the
hole, to sit flush with or below the
surface of the surrounding
material.
Counter bore - makes a flat-bottomed hole that might be used with a hex-headed cap screw
Pilot-Hole -
a smaller hole drilled into a material prior to a larger hole being drilled,
widening the hole to the desired width.
Pilot holes
are used when driving a screw. When a screw is driven into a material,
it can act as a wedge,
generating outward pressure which can
cause many materials to split. Drilling a small pilot hole into the material,
into which a screw is then driven, less 'wedging' takes place, thereby reducing
the likelihood of the material being
split.
Through-Hole - refers to a
hole that is reamed, drilled, milled etc., completely through the substrate. In
other words, a through hole is a hole that goes all the way through something.
Blind-Hole - a
hole that is reamed, drilled, or milled to a specified depth, thus without
breaking through to the other side of the work piece.