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digital read out
A digital read out (DRO) is a numeric display, usually with an integrated keyboard and some means of numeric representation. Its integral computer reads signals generated by linear encoders or (less frequently) rotary encoders installed to track machine axes, using these measures to keep track of and display to a machine operator the workpiece position (e.g., milling machines), or tool position (lathes, grinders, etc) in space.
In machine shop terminology the complete Digital Read Out system (consisting of a computer, axis position encoders, and a numeric display) is referred to by the acronym DRO. Such a system is commonly fitted to machines in today's shops, especially for metal working — lathes, cylindrical grinders, milling machines, surface grinders, boring mills and other machine tools — to allow the operator to work faster and with greater accuracy. Use of DROs is not limited to manually operated machines. CNC machines can usually be switched to manual operation, and in this case a form of DRO is simulated on its control panel.
==Display unit (computer)==
Several 7-segment displays, or an LCD screen on more expensive models display the position of each machine axis. Three-axis systems including the X, Y, Z axes are common on milling machines; those plus U and W are used on highly sophisticated 5-axis vertical machining centers. Lathes or cylindrical grinders typically use just X and Z axes, while a surface grinder may use only a Z axis.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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