find the material removal rate and time to machine. To produce a hole with D=8mm and...
find the material removal rate and time to machine.
To produce a hole with D=8mm and H=10mm at one end Al alloy rod by drilling. feed motion f=0.2mm/rev, rotational speed N is 1200rpm.
feed rate fr =N*F
Time to machine=(h+d/2)/fr
Material removal rate=πD^(2)fr/4
Homework Answers
machining time = Le(equvalent lenght)/Vf(feed velocity)
Le= throught length + compulsory approach
Le = H + 0.5D(for through hole)
Le = 10+ 0.5*8 =14mm
Vf =fN =0.2*1200= 600mm/min
Machining time = 14/600 =0.0233 min =1.4s........
Material removal rate MRR= (π/4)D2*(fN)
MRR=(3.14/4)*82*(0.2*1200)=30144mm3/min=502.4mm3/s
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