Write a part program using G and M code for machining external contour and drilling hole at the centre as shown in the figure . All dimensions are in mm.

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written 9.4 years ago by

teamques10 ★ 70k

Operation No.	Operation Desc.	Tool Desc.	Tool No.	Spindle speed	Feed rate
1.	Centre Drilling	H.S.S drill of diameter 15mm	01	700rpm	70mm/min
2.	Profile Milling	End mill cutter of diameter 20mm	02	600rpm	Vertical=240mm/min Horizontal =480mm/min

Speed Calculation:

Drilling:

Spindle Speed $N = \frac{1000 v}{π D} \hspace{1cm} ; v=30m/min = 700 rpm$

Feed rate $F=0.1 N = 70mm/min$

Profile Milling:

Spindle Speed $N = \frac{1000 v}{π D} \hspace{1cm} ; v=35m/min = 600rpm$

Feed rate $F=0.8 N \hspace{1cm} ;\text{Horizontal feed} = 480mm/min$

$\hspace{1.6cm} F=0.5 N \hspace{1cm} ;\text{Vertical feed} = 240mm/min$

Part Program:

%MPF 1122
N05 G00 G90 G71 G17 G94 X200 Y250 Z50 T01 S700 M06 *
N10 G00 X50 Y30 Z2 M13*
N15 G81 X50 Y30 Z-6 R2 F70*
N20 G00 X200 Y250 Z50 T02 S600 M06*
N25 G41 G00 X0 Y0*
N30 G00 Z2 M13*
N35 G01 Z-14 F240*  #assuming thickness as 12mm
N40 Y40 F480*
N45 X20 Y60*
N50 X100*
N55 Y20*
N60 G02 X80 Y0 R20 F480*
N65 X0*
N70 GOO Z2*
N75 G40*   
N80 X250 Y200 X50*                 
N85 M30*

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