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Spiral-Edge Countersinks: One Curved Slot Up the Cone Makes an Edge That Slices Instead of Scraping (Laursen, 1926)
Laust K. Laursen · Public domain
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Spiral-Edge Countersinks: One Curved Slot Up the Cone Makes an Edge That Slices Instead of Scraping (Laursen, 1926)

Laust K. Laursen of College Station, Texas, received US 1,586,559, dated 1 June 1926. Ordinary countersinks have straight edges in radial planes, which press on the wood all at once and scrape it, like pushing a knife straight down on a loaf. Laursen curved the edge into a spiral running up and out from near the point, ahead of the radial line as the tool turns. It reaches the wood a little at a time and slices, leaving a smooth countersink without chatter. His simplest form is one curved slot in the cone, its leading edge sharpened and the cone behind it relieved. We make a set of three in tool steel. The patent gives no sizes; every size here is ours.
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Maagizo

1

Why a spiral edge shears

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2

Read US 1,586,559

"In this particular form the spiral extends outwardly in the direction of action, that is to say, the usual direction of rotation of a countersink is clockwise, viewed from the top, or counterclockwise, as viewed from the bottom." "It has been found that a hole formed with a countersink as shown in Figs. 1 and 2 will be very smooth and uniform on the inside."
3

Turn the blanks

From octagonal tool steel turn three blanks: a 90 degree cone 3 to a point, 12, 16 and 20 mm across at its base, then the body 1 and an 8 mm shank 2 50 mm long with three filed flats. Heat each to a cherry red and let it cool slowly in the air to soften it.

Vifaa kwa hatua hii:

Kipande cha pembe nane cha feleji ya zanaKipande cha pembe nane cha feleji ya zana2 vipande

Zana zinazohitajika:

Kereza ya ChumaKereza ya Chuma
Chaki ya kereza yenye makucha 3Chaki ya kereza yenye makucha 3
Chombo cha kukata cha latheChombo cha kukata cha lathe
Patasi ya kukata kaziPatasi ya kukata kazi
Kipima-pembeKipima-pembe
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
Seti ya tupaSeti ya tupa
Jiko la KufuaJiko la Kufua
Koleo la forjiKoleo la forji
Miwani ya usalamaMiwani ya usalama
4

File the spiral slot 4

Blue the cone and scribe a spiral on it from 1 mm from the point to the rim, turning a quarter of the way round, leaning ahead in the direction the tool turns (clockwise seen from the shank). File a slot along it with a round needle file, 2 to 3 mm wide and 1.5 mm deep at the rim, shallower towards the point. Sharpen the slot's leading edge 5 and file the cone behind it slightly lower, so only the edge touches the work.

Zana zinazohitajika:

Seti ya tupa ndogoSeti ya tupa ndogo
Kibano cha mashineKibano cha mashine
Seti ya tupaSeti ya tupa
5

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 edge.

Zana zinazohitajika:

Jiko la KufuaJiko la Kufua
Koleo la forjiKoleo la forji
Sumaku NdogoSumaku Ndogo
Ndoo ya kupoza chumaNdoo ya kupoza chuma
MajiMaji
Jiwe la KunoleaJiwe la Kunolea
Glavu za kulehemuGlavu za kulehemu
Miwani ya usalamaMiwani ya usalama
6

Hone and test

Hone the edge lightly with the stone. Drill screw holes in hardwood and countersink them: the edge should cut a smooth bell with no chatter and throw curled shavings out of the slot.

Zana zinazohitajika:

Jiwe la KunoleaJiwe la Kunolea
Kekee cha BetriKekee cha Betri
Seti ya vichimbuziSeti ya vichimbuzi
Ubao wa Mti MgumuUbao wa Mti Mgumu
Miwani ya usalamaMiwani ya usalama
7

Troubleshooting

Spiral countersink troubleshooting.

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History and honest limits

**Laust K. Laursen** of College Station, Texas, US 1,586,559, dated 1 June 1926, filed 1 August 1925. He set out to give a countersink "a cutting blade or edge so arranged that it will tend to cut, rather than scrape, the work", each edge curving spirally of the tool. He shows three forms: one slot in a hollow head, two split halves with twin edges, and a many-bladed one he found better for metal; we make the first, in one piece. He gives no sizes or angle; our 90 degree cones, quarter-turn spiral and the house hardening are ours.

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Zana Zinazohitajika

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Cross-Hole Countersinks: A Slanting Hole Through the Cone Makes One Spiral Shearing Lip (Taylor, 1903)

Cross-Hole Countersinks: A Slanting Hole Through the Cone Makes One Spiral Shearing Lip (Taylor, 1903)

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Clamp-On Countersink: Two Blocks Screwed Round Any Drill, Twin Cutters Countersink the Hole as It Is Bored (Brackin, 1903)

Clamp-On Countersink: Two Blocks Screwed Round Any Drill, Twin Cutters Countersink the Hole as It Is Bored (Brackin, 1903)

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