Question

For machining a rectangular island represented by coordinates P(0,0), Q(100, 0), R(100,50 ) and S(0, 50) on a casting using CNC milling machine, an end mill with a diameter of 16 mm is used.
The trajectory of the cutter Centre to machine the island PQRS is

• A. (-8, -8), (108, -8), (108,58),(-8, 58), (-8, -8)
• B. (-8, 8), (94, 0) , (94,44), (8, 44), (-8, 8)
• C. (0, 0), (100, 0), (100, 50), (50, 0), (0, 0)
• D. (8, 8), (94, 8), (94, 44),(8, 44), (8, 8)

Answer 1

The correct option is A (-8, -8), (108, -8), (108,58),(-8, 58), (-8, -8)


Normal Coordinates:
P(0, 0), Q(100, 0), R(100, 50), S(0, 50)
with cutter compensation:
$P_1(-8,-8),Q(108,-8),R(108,58),S(-8,58)$