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Unformatted text preview: TC 9-524 GLOSSARY ACRONYMS AND ABBREVIATIONS TC - Training Circular TM - Technical Manual AR - Army Regulation DA - Department of the Army RPM - revolutions per minute SAE - Society of Automotive Engineers SFPM - surface feet per minute tpf -taper per foot tpi taper per inch UNC - Unified National Coarse UNF - Unified National Fine SF -standard form Med - medical WRPM - revolutions per minute of workpiece FF - fraction of finish WW - width of wheel TT - table travel in feet per minute sd - small diameter Id - large diameter ID - inside diameter TOS- Intentional Organization for Standardization LH - left hand NC - National Coarse NF - National Fine OD - outside diameter RH - right hand CS - cutting speed AA - aluminum alloys IPM - feed rate in inches per minute FPM - feet per minute of workpiece pd - pitch diameter tan L - tangent angle formula It - length of taper DEFINITIONS abrasive - natural- (sandstone, emery, corundum. accurate - Conforms to a standard or tolerance. diamonds) or artificial (silicon carbide, aluminum oxide) material used for making grinding wheels, Acme thread - A screw thread having a 29 degree sandpaper, abrasive cloth, and lapping compounds. included angle. Used largely for feed and adjusting screws on machine tools. abrasive wheels - Wheels of a hard abrasive, such as Carborundum used for grinding. acute angle - An angle that is less than 90 degrees. Glossary - 1 TC 9-524 adapter - A tool holding device for fitting together various types or sizes of cutting tools to make them interchangeable on different machines. addendum - That portion of a gear tooth that extends from the pitch circle to the outside diameter. align - To adjust or set to a line or center. allowance - The prescribed difference in dimensions of mating parts to provide a certain class of fit. alloy - A metal formed by a mixture of two or more different metals. angle iron - An iron or steel structural member that has been cast, rolled, or bent (folded) so that its cross section is L-shaped. angle plate - A precision holding fixture made of cast iron. steel, or granite. The two principal faces are at right angles and may be slotted for holding the work or clamping to a table. annealing - The controlled heating and cooling of a metal to remove stresses and to make it softer and easier to work with. anvil - A heavy iron or steel block upon which metal is forged or hammered-. also the fixed jaw on a micrometer against which parts are measured. apron - That portion of a lathe carriage that contains the clutches, gears, and levers for moving the carriage. It also protects the mechanism. arbor - A shaft or spindle for holding cutting tools; most usually on a milling machine....
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