Question A CNC drill press is to perform a series of through- hole drilling operations on a 1.75-in thick aluminum plate that is a component in a heat exchanger. Each hole is 3/4 in diameter. There are 100 holes in all, arranged in a 10 x 10 matrix pattern, and the distance between adjacent hole centers (along the square) 1.5 in. The cutting speed 1⁄4 300 ft/min, the penetration feed (z-direction) 0.015 in/rev, and the traverse rate between holes (x-y plane) 15.0 in/min. Assume that x-y moves are made at a distance of 0.50 in above the work surface, and that this distance must be included in the penetration feed rate for each hole. Also, the rate at which the drill is retracted from each hole is twice the penetration feed rate. The drill has a point angle 100o. Determine the time required from the beginning of the first hole to the completion of the last hole, assuming the most efficient drilling sequence will be used to accomplish the job.

ZINDS2 The Asker · Mechanical Engineering
A CNC drill press is to perform a series of through- hole drilling operations on a 1.75-in thick aluminum plate that is a component in a heat exchanger. Each hole is 3/4 in diameter. There are 100 holes in all, arranged in a 10 x 10 matrix pattern, and the distance between adjacent hole centers (along the square) 1.5 in. The cutting speed 1⁄4 300 ft/min, the penetration feed (z-direction) 0.015 in/rev, and the traverse rate between holes (x-y plane) 15.0 in/min. Assume that x-y moves are made at a distance of 0.50 in above the work surface, and that this distance must be included in the penetration feed rate for each hole. Also, the rate at which the drill is retracted from each hole is twice the penetration feed rate. The drill has a point angle 100o. Determine the time required from the beginning of the first hole to the completion of the last hole, assuming the most efficient drilling sequence will be used to accomplish the job.
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colutionThinkness of alluminium plate =1.75 in Dia of hole =0.7im No. of holes =100Distance b/w adjecunt hol contry =1,5in cutting spced -300ft//min=3600in//min penetration feed =0,015in//sev.Transverse rate b/w hole in x-y plane =15in//min x-y moves are made at distance of 0,5 in above work surbaceThe rate at which drill is retarded is twice the penetration feed rate.Drill. point angh =100 degree cutting speed (V)=pi DN=3600inDiameter (D) =0.7514Rotational speed (N)=1527.88 rev/min =25.46ra//sec feed rate (f)= feed ** sotational speed =0.015 xx25.46=0.3819m. since point angle i s give therefor apporch distance and time must be consideredAproach distance (A)=0.5 D tan(90-theta//2) =0,3146 i4It is mentioned that x-y moves are made at 0.5 inch above work surface. it must be included in approadiso total distance -drill must ome ==0.5+1.75+0.314 i=2.5646imTime req to complete drill (T_(1))= distace/teedrate=2.5646//0.3819=6.71secTime required to roscund drillIt is mentiond that drill is ... See the full answer