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A drill bushing, also known as a jig bushing, [1] is a tool used in metalworking jigs to guide cutting tools, most commonly drill bits. Other tools that are commonly used in a drill bushing include counterbores, countersinks, and reamers. They are designed to guide, position, and support the cutting tool. [2]
Simple diagram of a drilling rig and its basic operation. The kelly drive is #19. A kelly drive is a type of well drilling device on an oil or gas drilling rig that employs a section of pipe with a polygonal (three-, four-, six-, or eight-sided) or splined outer surface, which passes through the matching polygonal or splined kelly (mating) bushing and rotary table.
Indirect replacement for Model 377; first Peterbilt aerodynamic conventional with "wide-body" cab Shares cab structure with Kenworth T2000; built on Peterbilt frame, 387 has different hood, roof fairing, and interior design. Produced as day cab, mid-roof sleeper, and raised-roof sleeper. 388 : 2006-2015 on-highway (Class 8)
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Peterbilt Motors Company is an American truck manufacturer specializing in the production of heavy-duty and medium-duty (Classes 5–7) commercial vehicles.The namesake of company founder T. A. "Al" Peterman, it was established in 1939 from the acquisition of Fageol Truck and Motor Company, and has operated as part of PACCAR since 1958.
Bushing (bearing), a type of plain bearing; Bushing (electrical), an insulated device that allows a conductor to pass through a grounded conducting barrier; Bushing (isolator), a mechanical device used to reduce vibrational energy transfer between two parts; Drill bushing, a tool used to guide the placement of a hole when drilling in a workpiece
Ruby jewel bearings used for a balance wheel in a mechanical watch movement Cross-section of a jewel bearing in a mechanical watch. This type of donut-shaped bearing (red) is called a hole jewel, used for most of the ordinary wheels in the gear train.
Engineering fits are generally used as part of geometric dimensioning and tolerancing when a part or assembly is designed. In engineering terms, the "fit" is the clearance between two mating parts, and the size of this clearance determines whether the parts can, at one end of the spectrum, move or rotate independently from each other or, at the other end, are temporarily or permanently joined.