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\viewkind4\uc1\pard\qc\cf1\lang2057\b\f0\fs24 G73 High Speed Peck Drilling
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\par A G73 (High Speed Peck Drilling) command is written in the following format:
\par (G9\f1\'d8 or G91) (G98 or G99) G73 X.... Y.... Z.... Q.... F.... ;
\par
\par G.... is defined as the canned cycle.
\par X.... Y.... is defined as the hole position, in absolute or incremental value.
\par Z.... is defined as the distance from the R point to the bottom of the hole in incremental mode, or the position of the hole bottom in absolute mode.
\par R.... is defined as the distance from the initial level to the R point level in incremental mode, or the position of the Z datum in relation to the R point level in absolute mode.
\par P.... is defined as the dwell time to be performed at the bottom of the hole (see the G\'d84 code for more details).
\par
\par Q.... is defined as the cut-in distance value or shift value (Note - this is always specified as an incremental value).
\par K.... is defined as the number of repeats, for a series of holes. When not specified, K=1.
\par F.... is defined as the feedrate for machining.
\par
\par When machining, the drill is positioned at the co-ordinate point of the first hole, for the X and Y axes and at the initial level, for the Z axis. The G73 command is then read into the machine controller and the cycle begins.
\par The drill will rapid traverse to the R point level and begin to feed in, until a cut-in distance of Q is attained. At this point, the drill will retract a small distance (set within the machine controller). A cut-in distance of Q at the same feedrate will begin again, followed by a similar retraction. These movements will continue until the total Z depth has been reached.
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\par The drill will rapid traverse out to the Initial level, if a G98 code is programmed within the cycle, or to the R point level, if a G99 code is programmed within the cycle. At this point the next block is read into the machine controller. If this block contains an X, Y or X and Y co-ordinate the drill will position itself at that point and the high speed peck drilling cycle will begin again.
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