spec - Local Sector 7 web page

Cut Points¢£ ¢ ¤° and +270° are at the same position on a circle, but if a motor in spec¤ ¥¨£ ¤is sitting at 0°, itwill move ¢¢ ¤ ¥¤counter-clockwise by 90° ° position andclockwise by 270° to get to the +270° position.By setting a lower cut point for a particular motor, you can choose what value on thecircle the four-circle angle calculations will produce. That is, the calculations willplace the angle between the lower cut point and that value plus 360°.Cut points can be set for the θ, χ and φ four-circle angles. For the 2θ angle, the lower¡¤£ ¡£ ¡ ¦¥ ¥¨¢£¢ ¥°. For the azimuth-fixed modes, there is pseudo-cut point for the azimuthal angle. If the cut point is less than zero, the calculated azimuth will¢¢ £¢ ¥° and 0°,otherwise the azimuth will be between 0° and +180°. The default cut points are shown below.AngleDefault Cut Point¢£¢ ¥θ¢£¢ ¥χ¢£¢ ¥φψ 0The macro cuts can be used to set or display the cut points. With no arguments, itdisplays the current cut points. Two arguments are used to set a single cut point.Four arguments set all cut points.11.FOURC> cutsCut Points:th chi phi azimuth-180 -180 -180 0or12.FOURC> cuts phi 9013.FOURC> cuts -180 -180 90 014.FOURC>174 FOUR-CIRCLE REFERENCE INTERIM WORK-IN-PROGRESS (8/16/01) NOT FOR GENERAL DISTRIBUTION