Objective: In this chapter we will show how to mill out the axle holes for this CO2 Dragster from the left side. VI.1. Open the previously created file: Dragster axle hole 001.sldprt. VI.2. Select the CW tab. VI.3. Insert Mill Part Setup... We will build a mill part setup for the axle holes as we have before. VI.4. As with the roughing and smooth milling tool paths, we select the inside face on the wheel well to orient the CNC Mill Spindle or CNC Router to 90degrees to holes we are cutting. Page 1
VI.6. Click on the Mill Part Setup, Right Mouse Click and then select Insert 2.5 Axis Feature... This strategy does not use a multi surface feature. All that is intended is drill two holes completely through the CO2 Dragster block. VI.7. When the 2.5 Axis Feature Wizard appears, on Feature Type: select Hole on the pull down menu. Next, on the Use: field click on each sketch until you see the Holes highlight green on the model as you see to the right. CAMWorks will load the Sketch you need into the Entities selected: field. If you select the wrong sketch, then in the Entities selected field, select the sketch and then press your delete key. Press the Next >> key. Page 2
VI.8. Use the up and down arrow keys on the Depth: field to increase the depth of your holes you are planning to drill. As you see to the above right, the green highlighted holes go through the CO2 Dragster. This is what we need our Axle Holes. Select Finish. VI.9. Select close to complete our CW tab strategy setup. Page 3
VI.10. You will see the Hole initially pink. Select the Hole Group the right click and click on Generate Operation Plan. This will create the operations plan and open the Operations tab. VI.11. Here you see two strategies for the Mill Part Setup. First we will delete the Center Drill tool operations plan. We do not need to use this tool path, because we do not have to center drill our holes, due to the fact we are milling balsa wood. T-29 is sufficient for this process. Highlight the Center Drill3 and right click and select Delete. See below. Page 4
VI.12. Select the Mill Part Setup, right click, then select Edit Definition... VI.13. Select Sketch and then select off set to relocate the X-Y-Z Axis to the rear of the CO2 Dragster chamber. Page 5
VI.14. On the Axis tab, set the Angle to 180 degrees. Page 6
VI.15. Set your settings to the fields above and click OK. Page 7
VI.16. Select the Drill3 strategy and right click and then click on Edit Definition... VI.17. Select tool 29 and the click on the Select button. Page 8
VI.18. When this message appears, select No. VI.19. Here you see tool 29 and the settings we had previously setup. They are sill valid for our application of milling out axle holes. Select the F/S tab next. Page 9
VI.20. On the F/S tab, only set the Spindle speed to 10000. Page 10
VI.21. On the NC tab, make sure it is set as you see above. Page 11
VI.22. Select the pink Drill tool path, then right click and then click Generate tool path. The pink tool path will turn black and thus it is ready to simulate. VI.23. Click Drill tool path, the right click and then click Simulate Toolpath... VI.24. From this angle it appears the tool path has drilled two holes as planned. We need to see if it has drilled through the bottom of the CO2 Dragster block. Page 12
VI.25. Here you see the rotated block from the bottom side and the simulation shows that it has successfully drilled through the bottom of the CO2 Dragster block. VI.26. Observe the red rapid traverse lines and look for the fact that they start and return to the end Page 13
each time. This is critical in order to protect the CO2 Dragster block and fixture. VI.27. Select Drill tool path, right click and then select Post Process. VI.28. Change the Save as type: NC Code [*.nc] and save the file. This will open the Post Process Output wizard. Page 14
VI.29. Select the Play button as the top arrow indicates. Notice the Estimated Machine Time =...19 SEC. Select OK and save this file to your memory stick or thumb drive. Load the G-Code file onto your CNC Mill or CNC Router. Final Considerations: 1. The process to create the right side roughing and right side smooth tool paths are the same as the left side. 2. The difference is you select the opposite wall in the wheel wells for setting up the Mill Part Setup. This orients the CNC Spindle or CNC Router to the right side, perpendicular to the right side of the CO2 Dragster. 3. Use chapters IV and V as a reference and guide for setting up the tool paths for the right side of the CO2 Dragster. Page 15