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.Suppose you want to drill a 2-in. thick plate of cast steel (0.4%C), 4-in. diameter hole....

.Suppose you want to drill a 2-in. thick plate of cast steel (0.4%C), 4-in. diameter hole. An indexable HSS insert drill has been selected. Consider the table below, select the appropriate cutting speed, feed rate. Calculate the spindle speed (rpm), the feed rate (in/min), the MRR, and cutting time. Assume the cutting process will be performed in3 steps using 3 drills sizes in sequence 1”, then 2”, then 4”. Calculate the cutting total cutting time, considering a proper allowance each time.

Countersinking
7.
Suppose you want to drill a 2
-
in. thick plate of cast steel (0.4%C), 4
-
in. diameter hole. An indexable HSS insert dr
ill has been
selected. Consider the table below, select the appropriate cutting speed, feed rate. Calculate the spindle speed (rpm), the
feed rate (in/min), the MRR, and cutting time. Assume the cutting process will be performed
in
3
steps using 3
drills s
izes in
sequence 1”, then 2”, then 4”. Calculate the cutting total cutting time, considering a proper allowance each time.
8.
How much time will be required for milling machine to face mill an AISI 1020
steel
surface BHN 150, that is 12 in. long and

Countersinking
7.
Suppose you want to drill a 2
-
in. thick plate of cast steel (0.4%C), 4
-
in. diameter hole. An indexable HSS insert dr
ill has been
selected. Consider the table below, select the appropriate cutting speed, feed rate. Calculate the spindle speed (rpm), the
feed rate (in/min), the MRR, and cutting time. Assume the cutting process will be performed
in
3
steps using 3
drills s
izes in
sequence 1”, then 2”, then 4”. Calculate the cutting total cutting time, considering a proper allowance each time.
8.
How much time will be required for milling machine to face mill an AISI 1020
steel
surface BHN 150, that is 12 in. long and

Countersinking
7.
Suppose you want to drill a 2
-
in. thick plate of cast steel (0.4%C), 4
-
in. diameter hole. An indexable HSS insert dr
ill has been
selected. Consider the table below, select the appropriate cutting speed, feed rate. Calculate the spindle speed (rpm), the
feed rate (in/min), the MRR, and cutting time. Assume the cutting process will be performed
in
3
steps using 3
drills s
izes in
sequence 1”, then 2”, then 4”. Calculate the cutting total cutting time, considering a proper allowance each time.
8.
How much time will be required for milling machine to face mill an AISI 1020
steel
surface BHN 150, that is 12 in. long and

engineering   Mechanical-Engineering   
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Answer #1

Solution We have to assume, BHN = 280 Cutting speed = 30 oft/min in/min (Vc) = 9.14 m/min = 360 i and feed (1 0.023 in/eev. NNow, we have to calculate MRR 1 MRR FXDXN 0.02SV4 X28.75 4. = 0.71875 in inoin. -Cutting time to is for 1 tool (T.) Ti -> fo

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