center drill

center drill

[′sen·tər ‚dril]
(engineering)
A two-fluted tool consisting of a twist drill with a 60° countersink; used to drill countersink center holes in a workpiece to be mounted between centers for turning or grinding.
References in periodicals archive ?
To locate the positions of the hammer pin, trigger pin and safety lever holes there are small protrusions or stubs located on the sides of the receiver that feature center drill dimples or divots as starting points for drilling the holes.
Two cylindrical-shaped versions are available: PLAST Cut TC burs with Special End Cut, for use with CNC machines and robots, and PLAST Cut TC Burs with a Center Drill for manual use.
The ANCAs also are helping the toolmaker get better at what had already been one of its specials: make any design or size of any center drill, standard or special.
Securing a standard velocity Long Rifle cartridge in the headstock, we drilled a hollowpoint with a center drill driven in from the tailstock.
Be sure your piloted center drill cuts ONLY with its cutting lands and does not touch the inside of bore beyond the bore edge clearance cut you are making.
Tenders are invited for Hss Center Drill Size 3/16 Inch X 7/16 Inch As Per Specn-Bs-328-Pt-2-1950 Or Is 6708-1977.
Use a small center drill to start the hammer and trigger pin holes (and the safety lever hole too, even if it isn't as critical) then drill to just under finished size,, followed up with reaming to final size.
The next step is to ball mill the 12 outside shapes, center drill the part and then drill the six ports true to the center position.
Taping it to the plastic top, I spotted in the holes with a center drill chucked in hand drill and then drilled them to size.
The three KWG holes are spaced 50 meters apart in the central portion of the Morne Bossa prospect, UNDP estimated a drill indicated reserve, based upon a 25 meter center drill pattern, of 3 million tonnes grading 2.
Tenders are invited for Solid Carbide Center Drill Dia 3.

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