Engineering, 02.12.2019 20:31 shakira11harvey6

Agundrilling operation is used to drill a 9/64-in diameter hole to a certain depth. it takes 4.5 minutes to perform the drilling operation using high pressure fluid delivery of coolant to the drill point. the current spindle speed = 4000 rev/min, and feed = 0.0017 in/rev. in order to improve the

surface finish in the hole, it has been decided to increase the speed by 20% and decrease the feed

by 25%. how long will it take to perform the operation at the new cutting conditions?

Answers: 1

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:20

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero

Answers: 2

Answer

Engineering, 04.07.2019 19:20

Aseries piping system conveys methyl alcohol. the system consists of 70 m of 1- nominal pipe follow by 50 m of 2-nominal pipe, both schedule 40 commercial steel. the 1-nominal pipe contains 3 90° elbows (regular) anda fully open gate valve, all threaded. the pressure drop through the system is 150 kpa. determine the volume flow rate through the system that is horizontally laid.

Answers: 1

Answer

Engineering, 04.07.2019 19:20

Asimple speed reducer is composed of 2 spur gears. the pinion gear has a pitch diameter of 0.75" and 36 teeth while the driven gear has a pitch diameter of 4.0" and 192 teeth. a)-what is the diametral pitch of each gear? b)-if an electric motor rotating ccw at 3000 rpm is coupled to the pinion, what is the rotational speed of the driven gear? c)-if the torque delivered to the pinion is 1 n-m, what is the torque on the driven gear? d)-what is the power transmitted by the gear train?

Answers: 1

Answer

Engineering, 06.07.2019 03:10

Steel balls 12 mm in diameter are annealed by heating to 1150 k and then slowly cooled to 400 k in an air att 325 k and h -20 w/m2 k. assume the properties of the steel to be k- 40 w/m k,p 7800 kg/m3, and cp 600 j/kg k. a. determine whether lumped system method can be used to analyze this problem and if so why" b. determine the time required for the cooling process. c. determine the total amount of heat lost from each ball to the ambient air

Answers: 1

Answer

You know the right answer?

Agundrilling operation is used to drill a 9/64-in diameter hole to a certain depth. it takes 4.5 min...

Questions