87 back boring cycle B G91 Increment comm etting for work coordinate system or clamp at maximum spindle speed 92.1 Workpiece coordinate system prese G94 G97 13 Constant surface speed control cancel G98 10 Return to initial point in canned cycle Return to r point in canned cvcle G160 20 In-feed control function cancel (for grindin G161 n-feed control function( for grind 60R Fig 4-9 tool path The tool path in Fig 4-9 can be programmed as follow: G92x200.0Y40.0Z0 G90G03X140.0Y100.0R60.0F300 G02X1200Y60.0R50.0 G92X200.0Y40.0Z0 90G03X140.0Y100.0l-600F300 GO2X1200Y60.0L-50.0 2)In incremental programming G9lG03X-60.0￥60.0R600F300.; G02X-20.0Y-40.0R500 G9lG03X-600Y60.0l-60.0F300 i02X-20.0Y-40.0l-500G87 09 Back boring cycle G88 09 Boring cycle G89 03 Boring cycle G90 03 Absolute command G91 00 Increment command G92 00 Setting for work coordinate system or clamp at maximum spindle speed G92.1 00 Workpiece coordinate system preset G94 05 Feed per minute G95 05 Feed per rotation G96 13 Constant surface speed control G97 13 Constant surface speed control cancel G98 10 Return to initial point in canned cycle G99 10 Return to R point in canned cycle G160 20 In-feed control function cancel (for grinding machine ) G161 20 In-feed control function ( for grinding machine ) Fig 4-9: tool path programming sample 1 The tool path in Fig 4-9 can be programmed as follow: 1) In absolute programming G92X200.0Y40.0Z0; G90G03X140.0Y100.0R60.0F300.; G02X120.0Y60.0R50.0; or G92X200.0Y40.0Z0; G90G03X140.0Y100.0I-60.0F300.; G02X120.0Y60.0I-50.0; 2) In incremental programming G91G03X-60.0Y60.0R60.0F300.; G02X-20.0Y-40.0R50.0; or G91G03X-60.0Y60.0I-60.0F300.; G02X-20.0Y-40.0I-50.0;