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Sunday, December 13, 2015

G88 Boring cycle


                                                        The G88 boring is used rare, its use is limited to boring operations with special tools that requires manual interface at the bottom of the hole.  When this operation is completed, the tool is moved out of the hole for safety reasons. This cycle is used by some tool manufactures for certain operations.

Code line for G88 Boring cycle Spindle stop:


N100 G98 (G99) G88 X… Y… R… Z… P… F…


Diagram for G88 Boring cycle Spindle stop:


Steps for the G88 Boring cycle Spindle stop:


 1.       Rapid motion to XY position of the hole position.
       2.       Rapid motion to the R level, i.e., to the top of the hole position.
       3.       Feedrate motion to the depth in Z.
       4.       Dwell at the depth – in milli seconds (P).
       5.       Spindle rotation STOP (Feed hold condition is generated and the CNC operator switch's to manual operation mode and performs a manual task, then switches back to memory mode). CYCLE START will return to normal cycle.
        6.       Rapid retract to the initial level (with G98) or Rapid retract to R level (with G99).
        7.       Spindle rotation ON.

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  16. Yes I'm using this G88 Cycle, First spindle goes in bottom with given rpm and feed and at the bottom stop at given dwell time and after that spindle goes stop and tool return with rapid speed at till R point ...

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