Machine Shop Glossary
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Running Fit: A class of fit intended for use on machinery with moderate speeds, where accurate location and minimum play are desired.
Sae: The Society of Automotive Engineers.
Scale: The rough surface on hot finished steel and castings. Also, a shop term for steel rules.
Scraper: A hardened steel hand tool used to scrape surfaces very smooth by removing minute amounts of metal.
Screw Pitch Gage: A gage consisting of a group of thin blades used for checking the number of screw threads per unit of distance, usually per inch, on a screw, bolt, nut, pipe, or fitting.
Scribe: A steel rod 8 to 12-inches long and about 3/16 inches in diameter. It has a long, slender, hardened steel point on one or both ends.
Sector: A device that has two radial, beveled arms which can be set to include any number of holes on the indexing plate of a dividing head to eliminate recounting the holes for each setting.
Set: The bend or offset of a saw tooth to provide a clearance for the blade while cutting. Also, the permanent change in the form of metal as the result of repeated or excessive strain.
Set Screw: A plain screw used principally for locking adjustable parts in position.
Setup: The preparation of a machine tool to complete a specific operation. It includes mounting the workpiece and necessary tools and fixtures and selecting the proper speeds, feeds, depth of cut a . . . View Full Definition
Sf: Standard form.
Shank: That part of a tool or similar object which connects the principal operating part to the handle, socket, or chuck by which it is held or moved.
Shear Strength: The characteristic of a material to resist shear forces.
Shims: Very thin sheets of metal made in precise thickness and used between parts to obtain desired spacing. Sometimes they are laminated, to be pulled off to the desired depth.
Shoulder: A term for the step made between two machined surfaces.
Shrink Fit: A class of fit made when the outer member is expanded by heating to fit over a shaft and then contracts or shrinks tightly to the shaft when cooled.
Side Cutter: A milling cutter that has cutting teeth on the side as well as on the periphery or circumference.
Side Rake: That surface which slopes to the side of the cutting edge. It may be positive or negative and is combined with the back rake. See rake.
Sine Bar: A precision instrument for laying out, setting, testing and otherwise dealing with angular work.
Slabbing Cutter: A wide, plain milling cutter having helical teeth. Used for producing large, flat surfaces.
Slitting Saw: A narrow milling cutter designed for cutoff operations or for cutting narrow slots.
Slotter: An attachment which operates with a reciprocating motion. Used for machining internal slots and surfaces.
Soft Hammer: A hammer made of brass, copper, lead or plastic to a non-marring finished surfaces on machines or workpieces.
Soft Jaws: Plastic, leather, lead, or aluminum covers on the jaws of a vise or pliers used to prevent marking and damage to the work.
Solder: The metal or alloy used as a filler metal in soldering, which has a liquidus not exceeding 840ºF (450ºC) and below the solidus of the base metal.
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