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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. Novemba 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.
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Maagizo

1

Why the edges are set off the centre lines

Inapakia daftari la 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.

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

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.

Zana zinazohitajika:

Seti ya tupa ndogoSeti ya tupa ndogo
Kibano cha mashineKibano cha mashine
Seti ya tupaSeti ya tupa
Kisagia cha mezaKisagia cha meza
Kipima-pembeKipima-pembe
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.

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 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.

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

Four-edge countersink troubleshooting.

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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.

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Zana Zinazohitajika

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Spiral-Edge Countersinks: One Curved Slot Up the Cone Makes an Edge That Slices Instead of Scraping (Laursen, 1926)

Spiral-Edge Countersinks: One Curved Slot Up the Cone Makes an Edge That Slices Instead of Scraping (Laursen, 1926)

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Adjustable-Knife Countersink: Three Knives Set Out Evenly by a Collar and Stopped by a Depth Pin (Logan, 1921)

Adjustable-Knife Countersink: Three Knives Set Out Evenly by a Collar and Stopped by a Depth Pin (Logan, 1921)

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