Countersink


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countersink

[′kau̇nt·ər‚siŋk]
(design engineering)
The tapered and relieved cutting portion in a twist drill, situated between the pilot drill and the body.

Countersink

 

(Russian, zenkovka; from German senken, “to sink, lower”), a cutting tool used for countersinking. Countersinks usually form part of a set with centering drills. The sizes of countersinks in each set depend on the diameter of the hole; in all sets, the vertex angle is 60°. Coun tersinks are made for chamfering center holes with diameters of 0.5 to 1.5 mm (ordinary countersinks), for holes with diameters of 0.5 to 6 mm (with or without protective taper), and for holes with diameters of 8 to 12 mm (with tapered stem). Countersink cutting elements are made from high-speed steel; countersinks with tapered stems are welded and the stems are made from carbon structural steel.

countersink

countersink
A boring bit having a conical-shaped cutter; used to make a depression to receive the head of a screw or bolt so that it does not protrude above the surface.
References in periodicals archive ?
Carbide-tipped countersinks with quick-release (item 55264) are also available for use with quick-change chucks.
Each SMART-BIT[R] is designed with a countersink portion that is proportionate to the head of each corresponding screw size.
Countersink all nails, then cover them and woodscrews with wood putty.
To lock the guide in place at different angles, countersink another screw into the other 2-by-2 at various points along the guide's length.
Then, remove the shelves, again drill and countersink the fixings, and glue and screw the shelves in place with No.
Typically, the surgeon operates twice--once to drill, tap, countersink and install the screw, and later to remove the screw after the bone has healed.
Countersink the screws and cover with the decorative plugs.
For each screw hole, predrill with a 1-1/4-inch #8 screw pilot bit and countersink 3/16 inch for plugs.
To fix the top runner to the ceiling, use one and a half inch screws, which you need to countersink through the grove of the runner so that they don't catch on the doors.
Using a 3/8-2nch bit, center, drill, and countersink holes for the woodscrews through the verticals into the bottom and top pieces: one screw into each bottom end, two into each top end.
This expanded offering features a wide range of new tools, including material-specific turning insert grades, spotting drills, combined drill and countersink tools as well as additional solid carbide roughing end mills.
Tools Smoothing plane Portable circular saw Tape measure and straight edge Combination square and pencil Coping saw (or electric jigsaw) Hammer Spoke shaves: round-bottom and flat-bottom Electric drill Drill bits: 2mm, 3mm, 5mm, countersink bits Utility knife and scissors Cork sanding block or electric sander Screwdriver (cross-headed or slotted) Here's how: Preparing the boards 1.