Write a CNC program for drilling operation for making 4 X 7 12.5 holes in the plate as shown below, its thickness is given as 10 mm and explain at the steps in detail.

Mumbai University > Mechanical Engineering > Sem 4 > Production Process II

Marks: 10M

Year: May 2015

Operation Sequence:

Program:

% MPF222
N05 G00 G90 G71 G17 G94 X200 Y150 Z50 T01 S2500 M06*
N10 G00 X76 Y23.5 Z2 M13*   [Tool positions above 1st hole
N15 G81 X76 Y23.5 Z-10 R2 F250* [1st hole center drilling
N20 X128.5 Y76*         [2nd hole center drilling
N25 X76 Y128.5*         [3rd hole center drilling
N30 X23.5 Y76*          [4th hole center drilling
N35 G00 X200 Y150 Z50 T02 S600 M06*
N40 G00 X76 Y23.5 Z2 M13*   [Tool positions above 1st hole
N45 G81 X76 Y23.5 Z-12.5 R2 F60* [1st hole drilling
N50 X128.5 Y76*         [2nd hole drilling
N55 X76 Y128.5*         [3rd hole drilling
N60 X23.5 Y76*          [4th hole drilling
N65 G00 X200 Y150 Z50*
N70 M30*