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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. nóvember 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.
Miðlungs
About 1 day

Leiðbeiningar

1

Where the slanting hole must go

Hleð Jupyter-vinnubók…
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.

Efni fyrir þetta skref:

Áttstrent verkfærastálÁttstrent verkfærastál2 stykki

Nauðsynleg verkfæri:

MálmrennibekkurMálmrennibekkur
Þríkjálka rennibekkspatrónaÞríkjálka rennibekkspatróna
RennibekkjarstálRennibekkjarstál
FráskurðarjárnFráskurðarjárn
GráðubogiGráðubogi
Stafrænn skífmælir 6 tommurStafrænn skífmælir 6 tommur
ÞjalasettÞjalasett
AflinnAflinn
SmiðjutöngSmiðjutöng
ÖryggisglerauguÖryggisgleraugu
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.

Nauðsynleg verkfæri:

SúluborSúlubor
VélskrúfstykkiVélskrúfstykki
GráðubogiGráðubogi
BorasettBorasett
Stafrænn skífmælir 6 tommurStafrænn skífmælir 6 tommur
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.

Nauðsynleg verkfæri:

NálaþjalasettNálaþjalasett
VélskrúfstykkiVélskrúfstykki
BekkslípivélBekkslípivél
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.

Nauðsynleg verkfæri:

AflinnAflinn
SmiðjutöngSmiðjutöng
Lítill segullLítill segull
HerslufataHerslufata
VatnVatn
BrýniBrýni
SuðuhanskarSuðuhanskar
ÖryggisglerauguÖryggisgleraugu
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.

Nauðsynleg verkfæri:

BrýniBrýni
HleðsluborHleðslubor
BorasettBorasett
HarðviðarborðHarðviðarborð
ÖryggisglerauguÖryggisgleraugu
8

Troubleshooting

Countersink troubleshooting.

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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.

Efni

1

Nauðsynleg verkfæri

22

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