2D (Two-Dimensional) - Used in eMachineShop to refer to parts made from sheet material.
3D (Three-Dimensional) - Used in eMachineShop to refer to parts made from blocks of material.
Axis - A principal direction along which the relative movements of a tool or work piece occur. Three linear axes, occurring at 90 degree angles from each other, named X, Y and Z.
CAD - (Computer Aided Design) The use of computers to assist in design of mechanical parts and other items.
CAM - (Computer Aided Manufacturing) The use of computers to assist in manufacturing.
CNC - (Computerized Numerical Control) The computer control of fabrication machines to make custom parts.
Coefficient of friction - The ratio of the friction force to
normal force. For example, if it takes 1 lb of force to slide a 10 lb
weight along a level surface the coefficient of friction is 0.1. The
coefficient depends on the two materials involved.
Creep - The deformation of a part over time when under constant stress.
Fillet - In mechanical engineering, a fillet is a rounding of an interior or exterior corner of a part design.
Friction - Mechanical resistance of motion between two surfaces. See Static Friction and Dynamic Friction.
G-Code - The industry standard programming language that instructs a CNC machine what to do.
Galling - A type of wear that occurs when one surface slides
against another where particles of one part stick to the other part or break away from the surface.
Machining Center - Machine tools, normally Numerically Controlled, capable of automatically repeating many operations such as drilling, reaming, tapping, milling, and boring multiple faces on a work piece.
Machine Tool - A power driven machine used to form or shape metal and other materials.
N/C - Numerical Control - The technique of controlling a machine or process by using programmed command instructions in coded numerical format.
Nudge - The process of moving a line a fixed small distance across the screen using the arrow keys on the keyboard.
Pitch - the nominal distance between centers of repetitive shapes.
Polyline - A line having several segments. For example, a rectangle is a polyline with four segments.
Roughness - A measurable degree of non-smoothness of the surface related to the height of the peaks and valleys.
- A threaded fastener typically used to lock a sleeve, collar or gear
on a shaft. Set screws are normally headless. Set screw points can have
various shapes including cup, cone, oval, flat and dog.
Shank - The section of a bolt between the head and the threads. Or the section of a cutting tool that is held.
Snap - The process of moving one line so it exactly meets a key point on another line.
Static friction - The friction between two surfaces having no
relative motion. It is the force required to start relative movement.
Also known as stiction. Static friction is usually more than dynamic
Tangent - Two curves or lines that are parallel at the point where they meet.
Toolpath - The path that a cutting tool traverses in order to remove material to create a shape.
Torque - A measure of twisting force applied to a fastener,
shaft or other rotating member. Force is often measured in
newton-metres (Nm) or foot-pounds (ft-lb).
Tolerance - The acceptable variation in measurement.
Z Axis - The third dimension that cannot directly be shown in a flat drawing. The distance out from the drawing towards yourself.
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