shear strength
Stress required to produce fracture in the plane of cross section, the conditions of loading being such that the directions of force and of…
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Glossary Terms
shock loading
Tool is subjected to sudden, heavy loads and/or impacts, as in interrupted cutting. See interrupted cut.
shop air
Pressurized air system that cools the workpiece and tool when machining dry. Also refers to central pneumatic system.
shot peening
Cold working a metal’s surface by metal-shot impingement.
shrink-fit toolholding
Method of holding a round-shank cutting tool in a toolholder. To shrink-fit, the toolholder is heated in order to expand its bore, allowing…
shuttle mechanism
Mechanism typically used to feed parts into an assembly machine in a back-and-forth motion, inserting a part at the end of each stroke.
single-crystal diamond
Industrial-grade, natural diamond. Not recommended for cutting ferrous materials because it tends to react chemically with them and break d…
sintering
Bonding of adjacent surfaces in a mass of particles by molecular or atomic attraction on heating at high temperatures below the melting tem…
slack quenching
Incomplete hardening of steel due to quenching at a rate slower than the critical cooling rate for the particular steel, resulting in the f…
slotting
Machining, normally milling, that creates slots, grooves and similar recesses in workpieces, including T-slots and dovetails.
slotting attachment
Converts a milling machine’s rotary spindle motion into a reciprocating motion for machining keyways and slots.
S-N diagram
Plot showing the relationship of stress, S, and the number of cycles, N, before fracture in fatigue testing.