Subtractive Manufacturing Exercise #1 Part 3Key Fob ProjectUsing Velocity CNC Software for the CNC Milling Machine

Note:In order to use this set of instructions to produce the required program and part, you must have completed Part 2 of this exercise.

Open the Velocity CNC software.At the prompt, select “Don’t Connect”.

Note:The only time that you should select “Connect” is when you are actually preparing to use the CNC milling machine to produce a part.

Verify that the correct setup and tooling is in place for producing theG-code program for the CNC Milling Machine.

Look at the information located at the top left hand side of the screen.

Be sure it reads “D&MMILL-V4.stp – Velocity.tlg”.

If the setup or tooling needs to be changed see the instructor.

Select “Import DXF” from the “File” menu and import the same DXF file that you did for the first part of the exercise.

Note: Do not select “Open G-code” ,“Open Setup” or “Open Tooling” !

As soon as you select your DXF file, a prompt box will appear asking you to save your completed work as a “G-code” file (.CNC).Save your work as the DXF file name and add the number “2” (this is to indicate the 2nd set of G-code data that will be created for this project).The Velocity CNC software will now be changing the DXF data into G-code data.

Note:The original name of the program was “keyfob 4515”.The new name is” keyfob 4515 2”.

2

The settings on the configuration table will be the same as before with one exception – the “Final Tool Down” depth is be to set at -0.0600.

With the incremental setting at .03” and the final tool down setting at -.06”, two passes of the machine tool will occur. Two toolpaths will be visible in the emulation.

Set the “Additional G-codes” as before.The “Start of File” additional codes should read as below.

G00 Z.5G00 X0 Y0M05

Set the “Additional G-codes” as before.The “End of File” additional codes should read as below.

The goal this time around is to remove all of the toopaths other than the “slot” shape and the “hole”. Identify the lines of code to be removed by using the emulator and the editor.

The toolpaths should now appear as below. Two paths should be visible for both the hole and the slot.

It is now time to merge the G-code created in this part of the exercise with the code produced in the second part of the exercise to create one G-code program.

Highlight the code from this part of the exercise and copy it to the “clipboard” (Control + C).

Open the “G-code” file created for the second part of the exercise.

With the first G-code file opened, open the editor.

Paste the text from the second file created at the bottom of the first file created . Use “Control + V” to paste the text.

N510 G00 Z.5N520 G00 X0 Y0N530 M05N10 G00 Z.5N20 M03N30 G00 Z0.250N510 G00 Z0.250

(Import File: keyfob 4515.DXF)(Import Date: 1/13/2016)

N10 G00 Z.5N20 M03N30 G00 Z0.250N40 G00 X0.875 Y0.375N50 G01 Z-0.030 F5.00N60 G01 X0.875 Y1.125 F15.00N70 G01 X1.438 Y1.125N80 G02 X1.438 Y0.750 I0.000 J-0.188N90 G01 X0.875 Y0.750N100 G00 Z0.250N110 G00 X1.875 Y0.750N120 G01 Z-0.030 F5.00N130 G01 X2.625 Y0.750 F15.00N140 G00 Z0.250N150 G00 X2.875 Y0.563N160 G01 Z-0.030 F5.00N170 G03 X3.063 Y0.375 I0.188 J0.000 F15.00N180 G01 X3.438 Y0.375N190 G03 X3.438 Y0.750 I0.000 J0.188N200 G01 X3.063 Y0.750N210 G02 X3.063 Y1.125 I0.000 J0.188N220 G01 X3.438 Y1.125N230 G02 X3.625 Y0.938 I0.000 J-0.188N280 G00 Z0.250N290 G00 X2.625 Y0.375N300 G01 Z-0.030 F5.00N310 G01 X2.625 Y1.125 F15.00N320 G00 Z0.250N330 G00 X1.875 Y1.125N340 G01 Z-0.030 F5.00N350 G01 X1.875 Y0.375 F15.00N500 G00 Z0.250N510 G00 Z.5N520 G00 X0 Y0N530 M05N10 G00 Z.5N20 M03N30 G00 Z0.250N510 G00 Z0.250N520 G00 X4.063 Y0.750N530 G01 Z-0.030 F5.00N540 G02 X4.063 Y0.750 I-0.063 J0.000 F15.00N550 G01 Z-0.060 F5.00N560 G02 X4.063 Y0.750 I-0.063 J0.000 F15.00N570 G00 Z0.250N580 G00 X0.750 Y0.125N590 G01 Z-0.030 F5.00N600 G01 X3.750 Y0.125 F15.00N610 G03 X3.750 Y1.375 I0.000 J0.625N620 G01 X0.750 Y1.375N630 G03 X0.750 Y0.125 I0.000 J-0.625N640 G01 Z-0.060 F5.00N650 G01 X3.750 Y0.125 F15.00N660 G03 X3.750 Y1.375 I0.000 J0.625N670 G01 X0.750 Y1.375N680 G03 X0.750 Y0.125 I0.000 J-0.625N810 G00 Z0.250N820 G00 X0 Y0N830 G00 Z.5N840 M05

When pasting the two code programs together, remove the end lines of the first program associated with moving toward the origin (X=,Y=0) and stopping the spindle (M05).

Also remove the lines of code that are associated with the start of the second program that are associated with starting the spindle (M03).

In the final program, the emulation should indicate that the letters will be cut in one “pass” and the “hole” and the “slot” shaped perimeter will be cut in two “passes”.

Two lines indicate the two passes

One line indicates a single pass.

Run an emulation.

The toolpaths for the letters should indicate a single “pass” of the cutter.

The toolpaths for the hole and slot should indicate two “passes” of the cutter.

If the emulation still shows toolpaths being cut that should not be, repeat the editing process until all issues are resolved.

If you have removed too many lines of code or if there are multiple issues with the program, start again from the beginning.

If you believe the program to be correct, show me the emulation.