When a bar feeder is used as the fixture, the bar advance time describes the time to advance the bar into position for the next part to be machined. (The workpiece load time describes the time to load the entire bar into the bar feeder.)
The material at the end of a piece of bar stock that will not be used. The bar end, or bar remnant, is typically the result of a device holding the bar while the stock is cut. The bar end is used in determining how many workpieces a single piece of bar stock will yield.
Bar stock |
Structures that act as the bottom support for other parts. (Includes: feet, foundations, pedestals, platforms, shelves, stands, structures, supports, trays, etc)
Long, rigid structures that are attached at one or both ends to a surface to provide support. (Includes: arms, axles, bars, columns, cylinders, pillars, poles, posts, rails, rods, shafts, spokes, structures, struts, supports, trusses, etc)
An operation in which a boring tool enters the workpiece axially and cuts along an internal surface to form different features. The boring tool is a single-point cutting tool, which can be set to cut the desired diameter by using an adjustable boring head. Boring is commonly performed after drilling a hole in order to enlarge the diameter or obtain more precise dimensions. On a turning machine, a variety of features can be formed, including steps, tapers, chamfers, and contours. These features are typically machined at a small radial depth of cut and multiple passes are made until the end diameter is reached. For a finish turning operation, the cutting feed is calculated based on the desired surface roughness and the tool nose radius.
Boring (Milling machine) |
Bored hole |
Boring (Turning machine) |
Bored step |
Bored taper |
Bored chamfer |
Bored contour |
A cylindrical protrusion on a part that is used for aligning or fastening another part by accepting a screw or other insert through a hole in the center.
The type of box recommended for packing may be a corrugated cardboard box or a wood crate. Corrugated cardboard boxes are characterized by their wall thickness and test strength, which both determine the maximum weight the box can hold. The test strength listed here is the bursting strength measured in pounds per square inch.
Structures that can be fastened between two adjacent surfaces to provide support. (Includes: braces, hinges, structures, supports, etc)
ASTM E10. A common standard method of measuring the hardness of metallic materials. A hardened steel or tungsten carbide ball is pressed into the smooth surface of the material with a specific load. A microscope in used to measure the diameter of the indentation in the material surface and then compared to the corresponding Brinell Hardness Number (BHN) on a chart or calculated from a prescribed formula, the applied load in kilograms divided by the surface area of the resulting impression in square millimeters. The Brinell hardness test for steel involves impressing a 10 mm diameter hardened steel or tungsten carbide ball with a load of 3000 kilograms. The Vickers hardness scale is preferred for steels with a hardness over 500 BHN.