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Clamp-On Countersink: Two Blocks Screwed Round Any Drill, Twin Cutters Countersink the Hole as It Is Bored (Brackin, 1903)
George W. Brackin · Public domain
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13. Novemba 2026NO
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Clamp-On Countersink: Two Blocks Screwed Round Any Drill, Twin Cutters Countersink the Hole as It Is Bored (Brackin, 1903)

George W. Brackin of Philadelphia received US 727,580, dated 12 May 1903, for a countersink that clamps onto a drill or auger bit. Two blocks are screwed together across the bit at any point along it. A twin cutter is screwed into an inclined seat in each block, its point reaching into the bit's flutes. As the bit bores, the cutters arrive and cut the cone for the screw head without taking the bit out. A slotted stop sets how deep it goes, so it gauges the hole too. We make three for 4, 5 and 6 mm drills. The patent gives no sizes; every size here is ours.
Kati
About 1 day

Maagizo

1

Setting it on the bit

Inapakia daftari la Jupyter…
2

Read US 727,580

"From Figs. 2 and 3 it will be observed that the lower ends of the inclined cutters project slightly into the twists or helical channels of the drill, and this fact permits the cutters to enter the hole bored and then commence cutting away the edge of the hole as the tool is rotated."
3

Clamping blocks 2 and 3

For each attachment cut two blocks 40 x 12 x 10 mm from square bar. In each, 6 mm from one end drill a 4.5 mm plain hole and 6 mm from the other end drill 3.3 mm and tap M4, through the 12 mm face, so the two blocks screw together with the plain hole of one over the tapped hole of the other. Across the middle of each block's outer face file a seat 6 mm wide, sloping down and in at 45 degrees, and drill and tap M4 in it for the cutter's screw.

Vifaa kwa hatua hii:

Fimbo ya mraba ya chuma lainiFimbo ya mraba ya chuma laini1 kipande

Zana zinazohitajika:

Msumeno wa chumaMsumeno wa chuma
Kibano cha meza ya kaziKibano cha meza ya kazi
Kichora MistariKichora Mistari
Kigwe cha KatikatiKigwe cha Katikati
Kekee cha NguzoKekee cha Nguzo
Seti ya vichimbuziSeti ya vichimbuzi
Seti ya kukata nyuzi za skrubuSeti ya kukata nyuzi za skrubu
Mpini wa kukata nyuzi za ndaniMpini wa kukata nyuzi za ndani
Seti ya tupaSeti ya tupa
Kipima-pembeKipima-pembe
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
4

Twin cutters 8 and 9

Cut four cutters 22 mm long from 3 x 6 mm carbon steel strip. Drill each 4.5 mm for its screw at the top, and grind the lower end to a point with a straight cutting edge 13 on its leading side and a rounded back 15, as his Fig. 4. Harden: heat to a cherry red, until a magnet no longer sticks, quench in water, rub bright, and draw to a light straw colour.

Vifaa kwa hatua hii:

Utepe wa feleji ya kaboniUtepe wa feleji ya kaboni1 kipande

Zana zinazohitajika:

Msumeno wa chumaMsumeno wa chuma
Kekee cha NguzoKekee cha Nguzo
Seti ya vichimbuziSeti ya vichimbuzi
Kisagia cha mezaKisagia cha meza
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
5

Stop 17 and assembly

Bend a strip of 3 mm flat bar into an L, its upright 30 mm long with a 4.5 mm slot 18 15 mm long, its foot 20 mm. Screw a cutter into each block's seat. Put the blocks either side of the drill, the stop's slot under one clamping screw, and screw them together until they grip the drill, the cutters' points just in the flutes and their edges leading as the drill turns.

Vifaa kwa hatua hii:

Pau Bapa la Chuma LainiPau Bapa la Chuma Laini1 kipande
Skrubu za mashineSkrubu za mashine4 vipande

Zana zinazohitajika:

Msumeno wa chumaMsumeno wa chuma
Kibano cha meza ya kaziKibano cha meza ya kazi
Kekee cha NguzoKekee cha Nguzo
Seti ya vichimbuziSeti ya vichimbuzi
Seti ya tupaSeti ya tupa
Seti ya bisibisiSeti ya bisibisi
6

Bore and countersink

Set the drill's point the hole's depth below the stop's foot and the cutters for the screw head's size (the notebook gives both). Drill into hardwood until the stop touches: the hole is at depth and its mouth countersunk. Check a screw sits flush.

Zana zinazohitajika:

Kekee cha BetriKekee cha Betri
Seti ya vichimbuziSeti ya vichimbuzi
Ubao wa Mti MgumuUbao wa Mti Mgumu
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
Miwani ya usalamaMiwani ya usalama
7

Troubleshooting

Clamp-on countersink troubleshooting.

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8

History and honest limits

**George W. Brackin** of Philadelphia, US 727,580, dated 12 May 1903, filed 18 June 1902. He claimed "the rectangular clamping-blocks arranged parallel to each other, clamping-screws passing through the said blocks near their ends", each block "provided exteriorly at its middle point with a cutter-seat inclined downwardly and inwardly", and "duplicate and interchangeable cutters" screwed into them. His was for wood, with the note that the cutters could be hardened for metal; ours are hardened. He gives no sizes or angle; every size here is ours.

Vifaa

4

Zana Zinazohitajika

23

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

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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