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Four-Edge Chatterless Countersinks: Two Pairs of Edges Set Off the Centre Lines, One Raked Each Way (Manewich, 1946)
Joseph J. Manewich · Public domain
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13. noviembre 2026NO
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Four-Edge Chatterless Countersinks: Two Pairs of Edges Set Off the Centre Lines, One Raked Each Way (Manewich, 1946)

Joseph J. Manewich of Longmeadow, Massachusetts, received US 2,401,307, dated 4 June 1946, for a countersink that does not chatter. Four teeth are gashed in the cone. The inner ends of one pair of edges sit just ahead of a line through the centre, with their faces raked back. The other pair sit just behind a line at right angles, raked forwards. The edges keep changing how they meet the work as the tool goes in, and each steadies the one opposite, so it can run faster and leaves round, smooth countersinks. We make a set of three in tool steel. The patent gives no sizes or angles; ours are stated.
Avanzado
About 1 day

Instrucciones

1

Why the edges are set off the centre lines

Cargando el cuaderno de Jupyter…
2

Read US 2,401,307

"It has been found that the countersink tool by reason of its novel construction and arrangement may be operated at a higher speed than may those of the prior art while at the same time objectionable chatter is eliminated."
3

Turn the blanks

From octagonal tool steel turn three blanks: a 90 degree cone to a point, 12, 16 and 20 mm across, a short body 4 and an 8 mm shank 6 50 mm long with three filed flats. Heat each to a cherry red and let it cool slowly in the air.

Materiales para este paso:

Barra octogonal de acero para herramientasBarra octogonal de acero para herramientas2 piezas

Herramientas necesarias:

Torno de metalTorno de metal
Plato de torno de 3 mordazasPlato de torno de 3 mordazas
Herramienta de corte para tornoHerramienta de corte para torno
Gubia de tronzarGubia de tronzar
Transportador de ángulosTransportador de ángulos
Calibre digital de 6 pulgadasCalibre digital de 6 pulgadas
Juego de limasJuego de limas
FraguaFragua
Tenazas de fraguaTenazas de fragua
Gafas de seguridadGafas de seguridad
4

Mark and gash the four teeth 8

Blue the cone and scribe two diameters across its end at right angles. Mark the positive pair's edges 10 parallel to the first diameter, 0.5 mm ahead of it in the direction of turning, and the negative pair's edges 12 parallel to the second, 0.5 mm behind it. File or grind a gash 11 ahead of each edge, down the cone: for the edges 10 the face raked back about 8 degrees (positive), for the edges 12 raked forward about 5 degrees (negative). Give each edge a little clearance behind it.

Herramientas necesarias:

Juego de limas de agujaJuego de limas de aguja
Mordaza de máquinaMordaza de máquina
Juego de limasJuego de limas
Esmeril de bancoEsmeril de banco
Transportador de ángulosTransportador de ángulos
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 edges.

Herramientas necesarias:

FraguaFragua
Tenazas de fraguaTenazas de fragua
Imán pequeñoImán pequeño
Cubo de templeCubo de temple
AguaAgua
Piedra de afilarPiedra de afilar
Guantes de soldadorGuantes de soldador
Gafas de seguridadGafas de seguridad
6

Hone and test

Hone all four edges lightly with the stone. Countersink holes in hardwood and in a scrap of aluminium at a higher speed than usual: the cone should be round and smooth, with no chatter marks.

Herramientas necesarias:

Piedra de afilarPiedra de afilar
Taladro inalámbricoTaladro inalámbrico
Juego de brocasJuego de brocas
Tabla de madera duraTabla de madera dura
Gafas de seguridadGafas de seguridad
7

Troubleshooting

Four-edge countersink troubleshooting.

Flow

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8

History and honest limits

**Joseph J. Manewich** of Longmeadow, Massachusetts, US 2,401,307, dated 4 June 1946, filed 23 August 1944. He claimed cutting edges in two pairs, "the innermost portions of the cutting edges of one pair thereof disposed adjacent said longitudinal axis and forwardly" of a plane through it, and those of the other pair "rearwardly" of another plane at right angles. He calls the first positive edges with positive rake and the second negative with negative rake. He gives no sizes, offsets or angles; ours are stated, with the house hardening.

Materiales

1

Herramientas requeridas

21

Este plano hace

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Marcador

Juego de brocas avellanadoras

Free

325
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