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Cross-Hole Countersinks: A Slanting Hole Through the Cone Makes One Spiral Shearing Lip (Taylor, 1903)
John M. Taylor · Public domain
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13. November 2026NO
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Cross-Hole Countersinks: A Slanting Hole Through the Cone Makes One Spiral Shearing Lip (Taylor, 1903)

John M. Taylor of Hartford, Connecticut, received US 724,520, dated 7 April 1903, for a countersink that shears wood smoothly. Its conical head has a hole drilled through it at a slant that crosses the axis and reaches the point. One edge of that hole is the cutting lip, a spiral curve from the point out to the rim, and the chips go straight out through the hole to the back. A short band behind the cone guides it. We turn a set of three from tool steel and harden them. The patent gives no sizes; every size here is ours.
Fortgeschritten
About 1 day

Anweisungen

1

Where the slanting hole must go

Jupyter-Notebook wird geladen …
2

Read US 724,520

"One of the outer edges of the wall of the opening forms a cutting-lip 8, which is of spiral formation, whereby it is effective to make a shear cut, and terminates in a shoulder 9, forming an entering or cutting point 4 at the apex of the conical head 2."
3

Turn the blanks

From octagonal tool steel big enough for each head, turn three blanks: a 90 degree cone 2 to a sharp point, 12, 16 and 20 mm across at its base; a band 5 2 mm long at that diameter as the guide; a truncated cone 6 down to an 8 mm shank 50 mm long. File three flats on each shank's end for the chuck. Heat each to a cherry red and let it cool slowly in the air, to soften it for drilling.

Materialien für diesen Schritt:

Werkzeugstahl-AchtkantstabWerkzeugstahl-Achtkantstab2 Stück

Benötigte Werkzeuge:

MetalldrehmaschineMetalldrehmaschine
Dreibackenfutter für die DrehmaschineDreibackenfutter für die Drehmaschine
DrehmeißelDrehmeißel
AbstechstahlAbstechstahl
WinkelmesserWinkelmesser
Digitaler Messschieber 6 ZollDigitaler Messschieber 6 Zoll
FeilensatzFeilensatz
EsseEsse
SchmiedezangeSchmiedezange
SchutzbrilleSchutzbrille
4

Drill the slanting opening 7

Hold a blank in the machine vice tilted so the drill meets the cone's side at 35 degrees to the tool's axis, aimed to cross the axis just behind the point (the notebook gives how far). Drill through with a drill 0.45 of the head across: 5.5, 7 and 9 mm, so the hole breaks out through the point on one side and out of the back cone on the other. Open the back of the hole a little larger, so it tapers towards the shank.

Benötigte Werkzeuge:

StandbohrmaschineStandbohrmaschine
MaschinenschraubstockMaschinenschraubstock
WinkelmesserWinkelmesser
BohrersatzBohrersatz
Digitaler Messschieber 6 ZollDigitaler Messschieber 6 Zoll
5

File the lip 8

With a round needle file, clean the hole's edge on the side that leads as the countersink turns, leaving it sharp from the point to the band: that is the spiral cutting lip. File a little relief on the cone just behind it, and leave the shoulder 9 at the point.

Benötigte Werkzeuge:

NadelfeilensatzNadelfeilensatz
MaschinenschraubstockMaschinenschraubstock
DoppelschleiferDoppelschleifer
6

Harden and temper

Heat each head to a cherry red, until a magnet no longer sticks, and quench it point first in water, moving it about. Rub it bright with a stone, heat the shank gently 20 mm behind the head, and quench again as soon as a light straw colour reaches the cutting lip.

Benötigte Werkzeuge:

EsseEsse
SchmiedezangeSchmiedezange
Kleiner MagnetKleiner Magnet
AbschreckbottichAbschreckbottich
WasserWasser
SchleifsteinSchleifstein
SchweißerhandschuheSchweißerhandschuhe
SchutzbrilleSchutzbrille
7

Hone and test

Hone the lip lightly with the stone. Drill a few screw holes in hardwood and countersink them in the drill: the cone should cut a smooth bell without chatter and the chips should come out of the hole at the back.

Benötigte Werkzeuge:

SchleifsteinSchleifstein
AkkubohrschrauberAkkubohrschrauber
BohrersatzBohrersatz
HartholzbrettHartholzbrett
SchutzbrilleSchutzbrille
8

Troubleshooting

Countersink troubleshooting.

Flow

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9

History and honest limits

**John M. Taylor** of Hartford, Connecticut, US 724,520, dated 7 April 1903, filed 7 November 1901. He claimed "a countersink having a cone-shaped head provided with an opening crossing diagonally to the axis within the length of the tool and intersecting the apex of the cone, said opening having a curved edge forming a cutting-lip", and a two-part shank for brace or chuck. We make one-piece shanks for a chuck. He gives no sizes, angle or steel; our 90 degree cones, sizes and the house hardening are ours.

Materialien

1

Benötigte Werkzeuge

22

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