Copyright Goodheart-Willcox Co., Inc. 204 CNC Manufacturing Technology distance in the Tool Offset Geometry page for the corresponding active tool, Figure 9-23. Repeat this process for all tools used in the program. You will notice a Wear column next to the Geometry column. The Wear column is where small adjustments can be made to Z heights after the part is machined and measured. Safety Note Improperly called length offsets (H numbers) can lead to severe machine crashes. If the machine does not know the length of the tool from the home position, it can cause the tool to engage the material in a full rapid movement. 9.9.2 Diameter Offsets If the G41 or G42 commands have been used in the program, the diameter of those tools must also be defined. Recall how to use those commands. In a previous example, the program cut a 6″ × 3″ rectangle by using G41 (left cutter compensation). The tool we used was a .500″ end mill. T1 M6 (1/2“ End mill) Tool change to tool #1 G0 G90 G54 X−.5 Y0. M3 S5000 Rapid, G54 WCS, go to XY position, spindle on to 5000 rpm G43 H1 Z2. M8 Height offset 1, move to Z2., coolant on G01 Z−.5 F30. Feed to Z−.5 at 30 inches per minute G41 D1 X0. Turn on cutter comp left for tool 1, move to X position Y3. X5.5 X6.0 Y2.5 X and Y on same line create angle Y0. X0. G40 X−.5 Turn off cutter comp, exit move off part G0 G90 G54 X−.5 Y0. M3 S5000 Rapid, G54 WCS, go to XY position, spindle on to 5000 rpm Goodheart-Willcox Publisher Figure 9-23. The tool offset page where the tool height is stored or entered. PROBING TOOL 1 OFFSET 1 SPINDLE 2 3 4 5 6 7 8 9 10 0 0 0 0 0 0 0 0 4.5680 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. POSITION GEOMETRY WEAR GEOMETRY WEAR COOLANT H(LENGTH) D(DIA) TOOL OFFSET TOOL INFO