1. Relates only to machining centers

2. Commonly taught in basic CNC courses: G43 – tool length compensation 3G43 is well covered in basic courses 3Instate with G43 and H word 3Instate during each tool’s Z approach N050 G54 G90 S1200 M02 T02 N055 G00 X5.6 Y-0.6 N060 G43 H01 Z0.1 N065 G81 R0.1 Z-0.2 F5.0 Example: Instate tool length compensation

3. Commonly taught in basic CNC courses: G43 – tool length compensation 3G43 is well covered in basic courses 3Instate with G43 and H word 3Instate during each tool’s Z approach Not always taught in basic courses: áUsing secondary offsets

4. Commonly taught in basic CNC courses: G43 – tool length compensation 3G43 is well covered in basic courses 3Instate with G43 and H word 3Instate during each tool’s Z approach Not always taught in basic courses: áUsing secondary offsets

5. Commonly taught in basic CNC courses: G43 – tool length compensation 3G43 is well covered in basic courses 3Instate with G43 and H word 3Instate during each tool’s Z approach Not always taught in basic courses: áUsing secondary offsets G43 – tool length compensation Most applications require but one offset per tool… … but here is an exception Two counter- bored holes Good support Weak support Will push away during machining

6. Commonly taught in basic CNC courses: G43 – tool length compensation 3G43 is well covered in basic courses 3Instate with G43 and H word 3Instate during each tool’s Z approach Not always taught in basic courses: áUsing secondary offsets G43 – tool length compensation Most applications require but one offset per tool… … but here is an exception Two counter- bored holes Good support Weak support Will push away during machining O0001 (Program number) (SPECIAL NOTE: OFFSETS 3 AND 53 CONTROL TOOL THREE!) (INITIALLY, SET BOTH TO THE LENGTH OF TOOL THREE) (OFFSET NUMBER 3 CONTROLS LOWER SURFACE) (OFFSET NUMBER 53 CONTROLS UPPER SURFACE). N125 T03 M06 N130 G54 G90 S600 M03 T04 N135 G00 X1.0 Y1.0 N140 G43 H03 Z-2.9 N145 G82 R-2.9 Z-3.25 P500 F4.5 N150 G80 N155 G00 Z2.0 N160 G00 X5.0 Y4.0 N165 G43 H53 Z0.1 N170 G82 R0.1 Z-0.25 P500 F4.5 N175 G80 N180 G91 G28 Z0 M19 N185 M01 N190 …. Messages clarify what is going on Lower hole machined with offset three Upper hole machined with offset fifty-three Use a logical method to come up with the secondary offset number… …we added fifty to the tool station number

7. Commonly taught in basic CNC courses: G43 – tool length compensation 3G43 is well covered in basic courses 3Instate with G43 and H word 3Instate during each tool’s Z approach Not always taught in basic courses: áUsing secondary offsets