Broach

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Broach,

city, India: see BharuchBharuch
, formerly Broach,
city (1991 pop. 139,029), Gujarat state, W India, on the Gulf of Khambat. A port at the mouth of the Narmada River, Bharuch ships cotton, wheat, and timber and manufactures textiles, ink, and glass.
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.

Broach

A half pyramid above the corners of a square tower to provide a transition to an octagonal spire.

Broach

 

a metalcutting tool with multiple blades used on broaching machines to machine outer surfaces and through-holes. The following broaches are distinguished, based on the shape of the surface to be worked: cylinder, faceted (square, hexagonal, and so forth), spline, keyway, flat surface, and shaped surface broaches.

Figure 1. Broaches: (a) for internal broaching, (b) for external broaching; (1) pull end, (2) and (5) front and rear pilots, (3) cutting section, (4) finishing section

In broaches used for internal broaching (Figure 1, a), the teeth are arranged on a tapered cutting section; they carry out the major work of cutting the final layer of stock to size. The finishing section of the broach has from three to eight teeth. The first of these cut a very thin layer of metal and give the hole its final shape; the other teeth are spares and are used after the broach is reground. Broaches for external broaching (Figure 1, b) are manufactured in the shape of a rectangular bar and have cutting and finishing sections.

In addition to cutting broaches, there are burnishing broaches, which do not cut, but rather smooth and flatten metal. The flattened layer produced by such broaches has high resistance to wear. The teeth of burnishing broaches do not have cutting angles; they are sometimes positioned on the finishing section of the broach.

broach

[brōch]
(mechanical engineering)
A multiple-tooth, barlike cutting tool; the teeth are shaped to give a desired surface or contour, and cutting results from each tooth projecting farther than the preceding one.

broach

1. In quarrying, to free stone blocks from the ledge by cutting out the webbing between holes drilled close together in a row.
2. To finish a stone surface with broad diagonal parallel grooves cut by a pointed chisel.
3. A half pyramid above the corners of a square tower to provide a transition to an octagonal spire.
4. A spire sometimes springing from a tower without an intermediate parapet.
5. Any pointed ornamental structure.

broach

1. a long tapered toothed cutting tool for enlarging holes
2. a roof covering the corner triangle on the top of a square tower having an octagonal spire
3. a pin, forming part of some types of lock, that registers in the hollow bore of a key
4. a tool used for tapping casks
References in periodicals archive ?
During the interviews, we broached racial and ethnic differences with each participant, which may have affected participant disclosures in positive or negative ways.
Several different parts could be broached in small runs on the same machine with each part requiring a different set of broach tools.
Often flats are broached on motor shafts or tools requiring a flange or set-screw flat to lock a hub in place.
The broached shaft in the fixture is ready for unloading.
Technical and conversational, participants broached topics ranging from the importance of instinct in successful risk management and credentials shared by aspiring and established CROs.
Robert Urich shows a similar lack of restraint as a character (introduced with a line that would fail you in Exposition 101 - ``You know, you're my manager,'' Emeril tells him) who blows hard on any subject that might cursorily be broached in his vicinity.
Bob Roseliep feels his broached gear could solve a lot of these problems.
The idea for the special was first broached last weekend.
Toledo said he hasn't broached the subject with his team but conceded that starting on top can be important on the road.
We have the 40th president of the United States in our community, probably the most popular president that has lived,'' said Councilwoman Barbra Williamson, who broached the idea.
But Burbank city officials are cold to the idea broached by a Burbank resident opposed to the proposed expansion deal.
It features the ``Oak of Peace,'' where the idea of a peace treaty ending the California phase of the Mexican-American War was broached.