Use APT to write a NC program to mill the part shown in Fig. 4.104

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By using APT, the NC program is written and shown in Table 4.11. The first part (line 1–3) is to label the program, specify machining type, and select the tool. The second part (line 4–13) is to define all geometric entities. The third part (line 14–16) is to set up operating conditions for cutting speed, feed rate, and coolant supply. The fourth part (line 17–22) is for all motion statements. The last part (line 24–26) is to reset the tool position and terminate the machining operation.

Table 4.11 NC program to mill the part in Fig. 4.103

	NC Code	Explanation
Line 1:	PARTNO / EXAMPLE9-3	; label the program as “EXAMLE9-4”
Line 2:	MACHIN / MILL, 1	; select the target machine and controller type
Line 3:	CUTTER/ 0.5000	; specifies the cutter diameter
Line 4:	P0=POINT/-1.0, -1.0, 0.0	; geometry statement to specify the pertinent surface of part
Line 5:	P1=POINT/ 0.0, 0.0, 0.0
Line 6:	P2=POINT/ 6.0, 0.0, 0.0
Line 7:	P3=POINT/ 6.0, 1.0, 0.0
Line 8:	P4=POINT/ 2.0, 4.0, 0.0
Line 9:	L1=LINE/P1, P2
Line 10:	C1=CIRCLE/CENTER, P3, RADIUS, 1.0
Line 11:	L2=LINE/P4, LEFT, TANTO, C1
Line 12:	L3=LINE/P1, P4
Line 13:	PL1=PLANE/P1, P2, P3
Line 14:	SPINDLE/573	; set the spindle speed to 573 RPM
Line 15:	FEDRAT/5.39	; set the feed rate to 5.39 inch per minute
Line 16:	COOLNT/ON	; turn the coolant on
Line 17:	FROM/P0	; gives the starting position for the tool
Line 18:	GO/PAST, L3, TO, PL1, TO, L1	; initialize motion, drive, part, and check surfaces
Line 19:	GOUP/L3, PAST, L2	; contour the part in clockwise direction
Line 20:	GORGT/L2, TANTO, C1
Line 21:	GOFWD/C1, ON, P2
Line 22:	GOFWD/L1, PAST, L3
Line 23:	RAPID	; move rapidly once cutting is down
Line 24:	GOTO/P0	; return the tool to home position
Line 25:	COOLNT/OFF	; turn off the coolant
Line 26:	FINI	; terminate the program

Question 4.9: Use APT to write a NC program to mill the part shown in Fig....

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