ASME B5.54-2005 pdf download

ASME B5.54-2005 pdf download.Methods for Performance Evaluation of Computer Numerically Controlled Machining Centers.
Bryan principle: the straightness-measuring system should be in line with the functional point whose straightness is to be measured. If this is not possible, either the slideways that transfer the straightness must be free of angular motion or angular-motion data must be used to calculate the consequences of the offset. canned cycle: see fixed cycle. cap test: a check for electrical noise and drift of a trans- ducer, most commonly applied to displacement trans- ducers, sensors, or indicators (see Appendix I). In this Standard the check is normally performed by placing a stable “cap” on a displacementindicatorand monitoring its output over time. See also transducer drift check. capacitance (“cap”) gage: a displacement measuring device of relatively short range and high resolution that functions by measuring the electrical capacitance between the probe tip and the surface being displaced. catenary: curve formed by a flexible string, wire, band, or cable suspended between two spatially separated points of equal height in a gravitational field. The form of the curve is determined primarily by the tension in the suspended element and its mass per unit length. In the context of this Standard, a catenary correction refers to the difference between this curve and a straight line between the two suspension points, measured in a verti- cal direction. chatter: self-excited relative vibrations between the tool and the workpiece during the cutting process that may damage the cutting tool, the machine, or the part in roughing cuts and degrade the surface finish in finish- ing cuts. chip load: relative motion of the feed axis of the tool with respect to the workpiece, per tooth pass, usually measured in millimeters per tooth.
(a) radial compliance: applicable when the force and displacement directions are at 90 deg to the reference axis. (b) axial compliance: applicable when the force and the displacement are collinear with the reference axis. (c) tilt compliance: applicable for a pure moment and a tilt displacementin a plane containing the reference axis. (d) face compliance: applicable when the force and dis- placement are parallel to the reference axis and at a specified radial location. (e) linear compliance: applicable when the force and displacement are applied to a machine axis designed for linear motion. Linear compliance can be in the direction of the slide axis or perpendicular to that direction. (f) angular compliance: applicable when a pure moment is applied to a rotary axis in the direction of the designed angular displacement. computer numerical control (CNC): numerical control sys- tem in which the data handling sequence, control func- tions, and response to data input are determined primarily by a control program executed by a computer. contouring control system: system of control in which two or more machine axes move in a coordinated fashion so that the desired angular path or contour is generated. contouring mode: mode of operation of a CNC system that operates in one of the defined modes of interpola- tion (e.g., linear, circular, parabolic). control program: ordered set of instructions in a computer language and a format that provide a computer-based control system with the capability of properly executing system functions and commands of the machine program. cosine error: measurement error in the motion direction caused by angular misalignment between a linear dis- placement measuring system and the displacement being measured. coverage factor: numerical factor used as a multiplier of the standard uncertainty to obtain an expanded uncer- tainty, normally denoted k.