In this exercise, you will use some of Mastercam's circle milling toolpaths to machine the two large holes and the slot. You will learn the following techniques:
circle milling helical boring slot milling
Creating a circle milling toolpath
You will machine the largest hole with a circle milling toolpath.
1. Choose Main Menu, Toolpaths, Next menu, Circ tlpths, Circle mill.
2. Select the large arc on the left.
11. Choose OK.
12. Choose the Roughing check box and button.
13. Clear the Helical entry check box. Your roughing parameters should match the following picture.
14. Choose OK.
15. Make sure your other circle milling parameters match the following picture and choose OK.
19. Choose Backplot.
20. Toggle Verify to N.
21. Press [S] to step through the toolpath. You should see the circle milled as shown in the following picture.
22. Close the Operations Manager when the backplot is done.
Creating a helical boring operation
Mastercam's helix boring function takes advantage of the special
3. Choose Done twice.
4. Choose the 32 mm flat endmill.
5. Choose the Helix bore parameters tab.
6. Enter –25 for the Depth.
7. Choose Start at center.
8. Enter 3 for the Overlap. Your values should match the following picture.
9. Choose the Rough/finish parameters tab.
10. Enter 2 for Rough Pitch.
11. Enter 2 for Number of Rough passes and 5 for the Rough pass stepover amount.
12. Select the Finish check box.
13. Enter 1 for the Finish stepover. Your values should match the following picture.
14. Choose OK. Mastercam generates the toolpath. It should look like the following picture.
3. Choose Done.
4. Choose the 32 mm flat endmill.
5. Choose the Slot parameters tab.
6. Enter –25 for the Depth.
7. Enter 3 for the Overlap. Your values should match the following picture.
8. Choose the Rough/Finish parameters tab.
9. Enter a Plunge angle of 3.
10. Enter 1 for Finishing passes–Number and 1 for Spacing. Make sure your other parameters match the following picture.
11. Choose OK. Mastercam generates the toolpath shown in the following picture. You can see that the 3-degree plunge angle causes the tool to plunge into the part gradually and continuously during the roughing pass.
drilling operations
Frequently you need to combine several different drilling operations on the same set of holes; for example, spot drilling, pre-drilling, drilling, and tapping. In previous chapters, you created multiple operations on the same geometry by copying one operation and editing its parameters. For
drilling, Mastercam includes an even more powerful feature called Auto drilling. It lets you create a complete series of drilling operations from within a single dialog box.
In this exercise, you will use Auto drilling twice to drill two sets of holes.
First, you will drill the 12 mm through holes on the part corners and tabs.
Then, you will drill and tap the two rows of 10 mm holes. The holes are identified in the following picture.
12 mm holes
10 mm holes
4. Press [Enter] to confirm the default tolerance value of 0.001.
Mastercam uses this tolerance value to decide which arcs are the same size as the one you selected.
5. Choose Window.
6. Toggle Use mask = Y.
7. Click and drag a window around the whole part to select all the holes on the part and click again.
8. Choose Done. Mastercam highlights the six 12 mm arcs and
11. Choose OK. Mastercam should sort the holes as shown in the following picture.
5. Select the Home pos check box and button.
6. Enter a Z coordinate of 200 for the home position as shown in the following picture.
7. Choose OK.
8. Verify that your tool parameters match the following picture.
9. Choose the Depths, Group, and Library tab.
10. In the Drill group and type field, enter the following name for the drilling operations: 12 mm thru holes
11. Clear the Use arc views check box.
12. Enter a Depth of –25.
13. Clear the Override depth using lowest coincident selected arc check box.
14. Choose the Tip comp check box and button.
15. Enter a Breakthrough amount of 2.
16. Choose OK. Make sure your parameters match the following picture.
17. Choose the Pre-drilling tab.
18. Choose Generate pre-drill operations.
19. Enter 6 for the Minimum pre-drill diameter.
20. Enter 3 for the Pre-drill diameter increment. Your parameters should match the following picture.
21. Choose OK to generate the drill operations.
22. Press [Alt + O] to return to the Operations Manager.
23. Click and drag the lower corner of the window to make it bigger, if necessary. You can see the list of new operations that were created. Mastercam automatically creates a new toolpath group to contain them all.
Tip: You can edit any individual operation to fine-tune or customize it. Choose the Parameters icon for an individual operation to change the drilling parameters or select a different drill, or choose the Geometry icon to add or delete holes.
24. Choose OK to close the Operations Manager.
Selecting the holes for the second set of operations Your second set of drilling operations will be on the 10 mm holes.
1. Choose Main Menu, Toolpaths, Next menu, Circ tlpths, Auto drill, Mask on arc.
pre-drill cycle.
Finish drill operation This is determined by the Finish tool type on the Tool Parameters tab.
3. Press [Enter] to confirm the default tolerance value.
4. Choose Window.
5. Click and drag a window around the whole part and click again.
6. Choose Done.
7. Choose Options.
8. Choose the drilling pattern shown in the following picture.
9. Choose OK.
10. Choose Done. The Automatic Arc Drilling dialog box displays.
Setting the parameters for the second Auto drill operations For these holes, you want to include the following drilling cycles:
spot drill
pre-drill in 2 mm increments thread with a right-hand tap chamfer
The different parameters are pre-set with the values from your
previous Auto drilling session, so you only need to enter the changes.
1. From the Finish tool type drop list, choose Tap RH Fine.
7. Choose OK. Your settings should match the following picture.
8. Choose the Depths, Group, and Library tab.
9. In the Drill group and type field, enter the following name for
10. Choose the Pre-drilling tab.
11. Enter 2 for the Pre-drill diameter increment. Verify that your parameters match the following picture.
14. Review the list of new operations that were created.
15. Choose OK to close the Operations Manager.
16. Press [Alt + A] to save the part.
You've now seen a variety of applications for Mastercam's circle toolpaths. The next chapter will introduce you to more general purpose pocketing toolpaths and related functions.
EOC
Using a contour ramp toolpath