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The L. S. Starrett Company is an American manufacturer of tools and instruments used by machinists, tool and die makers, and the construction industry. The company was founded by businessman and inventor Laroy Sunderland Starrett in 1880. The company patented such items as the sliding combination square, bench vises, and a
[4] [2] The standard or square head has three adjacent flat faces, two of them meet square to one another, and the third face is angled away at 45°. When attached one face is parallel to the rule, one face is perpendicular, and one face is at 45°. The standard head usually incorporates a small spirit level and a small removable scriber. [4]
CMD Group, formerly Reed Construction Data and Construction Market Data, is a provider of business information for the North American construction industry. CMD is owned by ConstructConnect. Its historical roots lie in Construction Market Data, founded in 1982 to publish construction leads and market data.
[5] [6] Centre squares are also manufactured to be used as a head for a combination square. [7] Combination square, or sliding square A combination square features a ruler (the blade) which can be slid and adjusted within a head (the stock). The head usually has one face at 90° to the ruler, and another face at 45° to the ruler.
A machinist square or engineer's square is the metalworkers' equivalent of a try square. It consists of a steel blade inserted and either welded or pinned into a heavier body at an angle of 90°. Usually a small notch is present at the inside corner of the square.
[4] The PLCC uses a "J"-lead with pin spacings of 0.05" (1.27 mm). The metal strip forming the lead is wrapped around and under the edge of the package, resembling the letter J in cross-section. Lead counts range from 20 to 84. [5] PLCC packages can be square or rectangular. Body widths range from 0.35" to 1.15".
The Speed Square is manufactured from a variety of materials such as aluminum, steel, and composites such as HDPE. They are also made in several sizes such as 4, 6, 7, 8 and 12 inch, and 25 cm. Embedded degree gradations on the tool eliminate the need for trigonometric calculations and allow for lines to be more easily made.
In general, lead is equal to pitch times the number of starts. Whereas metric threads are usually defined by their pitch, that is, how much distance per thread, inch-based standards usually use the reverse logic, that is, how many threads occur per a given distance. Thus, inch-based threads are defined in terms of threads per inch (TPI). Pitch ...
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