broach

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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

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.
References in periodicals archive ?
After the acquisition, MHI plans to expand Federal Broach's production capacity in order to be able to aggressively market broaches and broach machines in the Asian market.
2) Pine tree type broaches are used for machining of grooves to mate blades and turbine discs in the fabrication of jet engines and various turbines.
Product Overview II-8 Select Dental Surgical Equipment - A Review II-8 Dental Instrument Delivery Systems Units II-8 Mobile Dental Units II-8 Stationary Dental Units II-8 X-Ray Systems II-8 Digital X-ray System II-9 Dental Lasers II-9 Dental Chairs II-10 Dental Stools II-10 Intra-oral Cameras II-10 Dental Hand Instruments II-10 Forceps II-10 Pliers II-11 Broaches II-11 Cutting Instruments II-11 Burs II-11 Others II-11 Infection Control Equipment II-12 Dental Supplies II-12
A broach is like a single point tool with many "points," each of which cuts like a flat-ended shaper tool, although some broaches have teeth set diagonally (shear cutting).
The Spiralglide tooth face broaches the part at an angle, so it is actually shearing the workpiece.
Heat-treating is essential to providing control of hardness, wear life, and quality for such tools as round broaches, pot broaches, internal spline and running gear broaches, broaching lead bars, and related wear components.
Other keyway broach sets, also available from stock, contain smaller or larger broaches and bushings and extend the range of keyway sizes that can be cut from 1/16" top 3/4" keyways in bores from 1/4" to 3" bore diameter.
The design relies on electronic control of simple tools, rather than dedicated broaches.
One of our most recent improvements in broach manufacturing is grinding the tooth gullets of hardened M-2, M-3, M-4, and T-15 toolsteel broaches to full depth from the solid in a single creep-feed pass.
Blind holes can be broached by limiting the travel to a series of short push-pull type broaches.
Unlike internal broaches, which are usually singlepurpose tools, many external broaches can be reused for new applications.
Conventional pot broaches cantilever the pot and hydraulic ram on a column.