Lab LEARNING HOW TO PROGRAM STRAIGHT 5 TURNS ON CNC MILL Objective: Learning how to program straight turns on cnc lathe Design Grid: You will write this program with absolute coordinates. This means you specify points in the program from the Program Reference Zero (PRZ), which is X0 Z0. Basic Commands FEED (G94), SPEED (M04), MOVE (G01), RAPID (G00) These commands work in the same way for cnc lathe as for cnc mill. The only difference is that the maximum spindle speed in case of Level 4 cnc lathe model 5500 is 3600. ROUGH.CUT (V10) This command specifies the maximum depth of cut to make for each of the rough cuts of a canned cycle. When the lathe executes a turning cycle, the total amount of material to be removed is divided into tool passes. The tool makes passes to remove the amount specified by the ROUGH.CUT command. The format is: ROUGH.CUT 0.025. This sets the maximum amount of material to be removed on each tool pass at 0.025in. FINISH.CUT (V11) FINISH.CUT command works with the ROUGH.CUT command. First, the tool makes passes to remove the amount specified by ROUGH.CUT command until there is lesser material remaining to be removed then the ROUGH.CUT passes are cutting. The tool will then make shallow cutting passes at the FINISH.CUT depth until the final cut depth is reached. The format is same as ROUGH command TURN (G81) This command implements a canned turning cycle of stock on the lathe. This command turns down the stock from the current position to the given X,Z position. The format is: TURN end point coordinates Procedure: Open New Part Program 1. Open the Level4 CNC software for lathe. 2. On the menu, click File and New. The Program Setup window appears. 3. Type “gauge” in the Program Name field. 4. Type your name in the Author field. 5. Type “Activity 1” in the Drawing ID field. 6. The available stock size is 0.75”x1.5”. Fill these dimensions into the Stock Size field 7. Leave the Editor field set o Line Mode, the Unit field set to inches, the Coordinates field set to Absolute and Material set to Wax. 8. Click OK. A blank editor appears with the name gauge Write the Part Program Write the following Part Program in your editor ROUGH.CUT 0.025 FINISH.CUT 0.01 FEED 8 SPEED 1500 RAPID X0.375 Z1.55 “This moves the tool slightly past the end of the stock” TURN X0.3125 Z0.875 * RAPID X0.32 Z1.55 TURN X0.25 Z1 RAPID X0.275 Z1.55 TURN X0.1875 Z1.125 RAPID X0.2 Z1.55 TURN X0.125 Z1.25 RAPID X0.15 Z1.55 TURN X0.0625 Z1.375 RAPID X0.075 Z1.55 END * The turn starts at the end of the stock and end at 0.875 along the z axis. In case of diameter, the tool starts at 0.375 and travels to 0.3125. This is a total of 0.0625. The tool will make two rough cut passes which remove 0.025 each, a total of 0.05. This leaves 0.0125 to remove. The first finish cut pass will remove 0.01 and the second will remove the remaining 0.0025. All the next turn cycles will be 0.0625” deeper and 0.125” shorter than the previous one. Save the program Program should be saved before compiling. Go to File Menu, click save Compile the part program To compile the part program, go to Lathe Menu and then click compile or press Alt F9 Emulate the part program Go to Lathe Menu and then click the Emulator. This will allow you to view the current part program on the Tool Path Emulator and, once you have tested the program, allow you to transfer the program to the remote Lab-Volt lathe.
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