1 Thick oxide coating on material normally associated with hot working. 2 Deposit formed from solution directly in place upon a confining surface.
Scallop
Edge condition resulting from nibbling a feature in a turret press.
Scrap
Leftover, unused material relegated to recycling.
Selective Perforation
Hole or slot pattern over a specific portion of a workpiece, normally used for ventilation purposes.
Self Extracting Archive File
A library file that can automatically create a group of CAD files without requiring the operator to have any special knowledge, or use special software.
Self Fixturing
Part designed to be self-locating into proper position to another part with the use of built-in locators.
Self Locking Fastener
Fastener which is machined with interference threads or which has a nylon insert or other locking mechanism to securely hold mating fasteners in high torque or vibration applications.
Semi-Gloss
A gloss range between high gloss and eggshell, approximately 35 to 90 on the 60 degree gloss scale.
Semi-Perfs
See Half Shear.
Shake Aparts
Term designating a family of parts on a sheet which are held by Micro Ties so small that the parts can be removed from the sheet after CNC punching by simply shaking the sheet.
The art of forming metal over a mold in one pass using hand or hydraulic pressure.
Shearing
Cutting force applied perpendicular to material causing the material to yield and break.
Shear-to-Feature
Shearing of an edge of stock to an exact dimension from an already existing feature.
Shielding Gas
Inert gas used for oxidation protection during welding.
Shim Steel
Steel which has been rolled thin to a hard condition and very close tolerance.
Shunting
Short circuiting of a weld current through a previously applied weld nearby.
Shut Height
Clearance in a press between ram and bed with ram down and adjustment up.
Silicon Carbide
Mineral used for abrasive metal removal.
Silkscreening
Printing process using special inks being pressed through a finemeshed fabric which has been prepared by a photo process to let the ink pass through in predetermined patterns of lettering and graphics.
Single Action
Press utilizing one moving element.
Sinkhole
In welding, a dimple on the surface of stock caused by shrinking of the weld during cooling.
Skid Marks Roll Slip
Polished or burnished streaks across the stock surface resulting from improperly set roller driven material processing equipment. Skid marks are transverse to the direction of rolling.
Skin Packaging
Thin poly film which is stretched or heat shrunk over parts for protection or display.
Skin-pass
Single cold rolling process on material after a heat treating process.
Slide Forming
A high-volume stamping process in which a machine with multiple slides sequentially performs various operations i.e. - blanking, piercing, forming, etc..
Slot-to-Form
Distance from a slot edge to the inside edge of a formed feature.
Slug
Scrap from a piercing operation.
Slug Marks
Surface defects caused by scrap being indented into the metal surface.
Soft Tooling
A term generally applied to the fabrication of metal parts using computer controlled technology incorporating CNC turret presses, laser profilers and press brakes.
Solids
The ability of the CAD software to realize that a volume is filled with solid matter. These CAD systems can display a design so that it looks like a solid object. Includes recognition of surfaces and wireframes.
Solution Heat Treat
High temperature process in which an alloy is heated to the suitable temperature for the alloy constituents to be in a totally soluble condition for the purpose of creating a homogeneous alloy. Through rapid cooling the constituents stay in this solution state. Metal so treated is left in a super saturated unstable state and may tend to age harden at ambient temperatures.
Solvent Based
Paint type in which a volatile liquid is used to dissolve or disperse the film-
Spatter
In welding, droplets of matter deposited as contaminants.
Spectral
Adjective referring to spectrum. See Spectrum.
Spectrophotometer
Device for the measurement of spectral transmittance, spectral reflectance, or relative spectral emittance.
Spectrum
Spatial arrangement of components of radiant energy in order of their wavelengths, wave number or frequency.
Specular Gloss
Relative luminous fractional light reflectance from a surface in the mirror or specular direction. Expressed as a ratio of incident to reflected light.
Spheroidizing
A heat treating process used to change all of the carbides in steel to rounded particles, or spheroids. A completely spheroidized structure is the softest and most workable structure for any composition.
Spinning Blank
A circular disk made from sheet or plate metal.
Spot Face
Circular flat surface as a bearing area for hardware.
Spring Back
Partial rebounding of formed material caused by its elasticity.
Spring Loaded Panel Fasteners
Inserted fastener which is equipped with a floating captive screw, spring and retainer such that the hardware will remain in the panel, ready for use, when the panel has been disassembled from its mating component.
Squareness
Measure of perpendicularity of adjacent edges or surfaces.
Stack-Ups
Tolerance accumulations.
Stainless Steel
Various ferritic alloys exhibiting high oxidation resistance through the alloying with chromium and nickel.
Stains
Discoloration on the surface of sheet metal, caused during mill processing.
Staking
Method of fastening using displaced material for retention.
Standard Vee Die
See V Die.
Stiffening Rib
Embossed feature in a sheet metal workpiece which is added to make the part more rigid.
Stock Check
A device used to grip the material as the feed retracts, preventing movement of the material during the forming cycle.
Stock Reel
A powered or non-powered device used to support a coil of material as it is fed into the machine.
Stock Straightener
A machine mounted device consisting of a series of adjustable rolls used to straighten wire or strip stock as it comes off the coil.
Stretch Wrap
See Skin Packaging.
Stretcher Leveled
A flattening process in which a material is stretched to achieve a desired flatness tolerance.
Strip Edge Forming
The use of a rolling technique to edge roll slit strip with shaped edge rolls to provide an edge finish equal to the material's surface finish. Also called edge conditioning.
Stripper
Mechanical hold-down device applied to the workpiece during the punching process.
Stripper Marks
Imprints on one side of the stock around pierced holes, caused by punch strippers.
Stripping
Process of disengaging tooling from the workpiece.
Strips
Sheet material, sheared into narrow long pieces.
Stroke
RAM travel from top dead center TDC to bottom dead center BDC.
Substrate
Original material surface to which a coating is applied.
Surface
The ability of the CAD software to recognize that a closed geometric shape represents a surface of a part. Includes recognition of wireframes.
Surface Inclusions
Debris rolled into the skin of material causing a depression or thinly coated pocket.
Surgical Stainless Steel Types
Any of the 300 series stainless steels with an 18% chromium and 8% nickel content. Also includes the PH type of stainless steels.
