Broach

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Related to broaches: brooches

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 ?
Table 28: World Long-term Projections for Dental Hand Instruments by Product Segment - Forceps, Pliers, Broaches, Cutting Instruments and Burs Markets Independently Analyzed with Annual Sales Figures in US$ Million for Years 2011 through 2015 (includes corresponding Graph/Chart) II-69
Table 30: World 10-Year Perspective for Dental Hand Instruments by Product Segment - Percentage Breakdown of Dollar Sales for Forceps, Pliers, Broaches, Cutting Instruments and Burs for Years 2003, 2008 & 2012 (includes corresponding Graph/Chart) II-71
Market Analytics III-26 Table 38: US Recent Past, Current & Future Market Analysis for Dental Surgical Equipment by Product Segment - Dental Instrument Delivery System Units (Mobile, Stationary), Digital X-ray Systems, Dental Lasers, Chairs & Stools, Intra-oral Video Cameras, Dental Hand Instruments (Forceps, Pliers, Broaches, Cutting Instruments, Burs) and Infection Control Equipment Markets Independently Analyzed with Annual Sales Figures in US$ Million for Years 2000 through 2010 (includes corresponding Graph/Chart) III-26
Push broaches are often used with a simple arbor press if quantities of work are low.
Pull broaches are pulled either up, down or horizontally through or across the workpiece, always by a machine.
Internal broaches are either pulled or pushed through a starter hole.
Pot broaches are used to produce external forms on parts that are passed through the pot, which holds ring-type and/or stick-type cutting tools.
Ring gears have been successfully produced by Red Ring broaches with side-shaving shells developed by National Broach for many years.
In the case of most broaches, gullet-spacing tolerances of [plus or minus] 0.
Eliminating the milling operation reduced broach-production time and cost substantially, and grinding from the solid with electroplated CBN wheels has helped improve performance of our broaches.
Straddle broaches with facing teeth are shown in the foreground.
To produce other tang dimensions, broaches can be adjusted closer or farther apart in the holder.