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 ?
Length: The length of a broach tool, or string of tools, is determined by the amount of stock to be removed, and limited by the machine stroke.
As with manual machines a limit can be placed on the amount of force incurred during each broach cycle.
"The lack of a pit or platform means that the BV-T is easier to access than a conventional vertical broach. Parts and panels are easily accessed, which simplifies inspection and maintenance operations," insists Mr Jones.
Heat treating is also necessary to stress-relieve the broaches and can be performed as many as five times during the broach manufacturing process at National Broach to ensure broach tool stability.
When overheated and cooled, broach materials may develop residual tensile stresses that promote fatigue cracking in service and thus shorten broach life.
For through-hole broaching, no obstructions can be present to block passage of the broach. When broaching blind holes, the operation must first provide a recess larger than the diameter of the hole to be broached at the bottom of the blind hole for chip removal.
A solid majority (65 percent) of advisors who sold $1 million-plus in annuity premium last year almost always broached the topic with clients aged 60-plus.
His son, Francis Lapointe, founder of American Broach of Michigan, is known as "the father of modern broaching."
"The cost of the broach was [pounds sterling]15 and although it seemed expensive I bought it because I assumed that the majority of the money would be going to the British Legion.
David mother-fuckin' Broach. The kid punks that fool out.
(MHI) is taking an important step to intensify its proposal-based marketing of machine tools and cutting tools to the world market through a new approach collaborating with Federal Broach Holdings, LLC, a company MHI acquired this April.
Federal Broach specialises in the production of broaches and broach machines, including helical broaches, which are used by auto makers, and "pine tree" type broaches, which are used in aircraft engines and power generation systems.