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 ?
Sandvik Mining said its line of top center drill bits are now available as standard products in three sizes.
For the most precise hole location, first drill a starter hole with a small center drill or small drill bit.
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 A 4X 10 Mm Center Drill Make: Addison/It
I then used a center drill to spot the three remaining holes for completion of the hole drilling and threading.
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.

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