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Consider the drilling of Feature 3 (Thru Hole) on the flashlight head (Figure 1). Assume the feed of the drilling operation (i.e., the distance the drill penetrates per unit revolution) is f = 0.01 in/rev.

Consider the drilling of Feature 3 (Thru Hole) on the flashlight head (Figure 1). Assume the feed of the drilling operation (i.e., the distance the drill penetrates per unit revolution) is f = 0.01 in/rev.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Problem 1: Drilling Operation Consider the drilling of Feature 3 (Thru Hole) on the flashlight head (Figure 1). Assume the feed of the drilling operation (i.e., the distance the drill penetrates per unit revolution) is f = 0.01 in/rev. 1 0.000 0.500" 0.377" (V') 1.500" Recommended tool: V drill bit. Recommended speed: 1200 RPM. Figure 1. Thru bole step for Problem 1. .00s'0- .000'0
Transcribed Image Text:Problem 1: Drilling Operation Consider the drilling of Feature 3 (Thru Hole) on the flashlight head (Figure 1). Assume the feed of the drilling operation (i.e., the distance the drill penetrates per unit revolution) is f = 0.01 in/rev. 1 0.000 0.500" 0.377" (V') 1.500" Recommended tool: V drill bit. Recommended speed: 1200 RPM. Figure 1. Thru bole step for Problem 1. .00s'0- .000'0
a) Calculate the Material Removal Rate (MRR) (in in3 /s or mm3 /s). b) Compute MRR in part (a) by considering the following cases Feed (f) in/rev Rotational Speed (N) in RPM MRR 0.02 1100 ? 0.03 1000 ? 0.04 900 ? c) What can you conclude from (b) as far as MRR variations? d) Use the Taylor Tool Life equation to estimate the tool life (in minutes) for this operation. Use the table below to pick appropriate values of C and n (the flashlight material is titanium and the tools are high-speed steel). How many such holes would you be able to drill before the tool needs to be replaced? C Nonsteel Cutting Steel Cutting Tool Material m/min (f/min) m/min f/min Plain carbon tool steel 0.1 70 20 (200) (350) (2700) 60 High-speed steel 0.125 120 70 200 Cemented carbide 0.25 900 500 1500 Cermet 0.25 600 2000 Coated carbide 0.25 700 2200 Ceramic 0.6 3000 10,000 Compiled from (4). [9), and other sources. The parameter values are approximated for turning at feed 0.25 mm/rev (0.010 in/rev) and depth = 2.5 mm (0.100 in). Nonsteel cutting refers to easy-to-machine metals such as aluminum, brass, and cast iron. Steel cutting refers to the machining of mild (unhardened) steel. It should be noted that significant variations in these values can be expected in practice. Table 1. Representative values of n and C in the Taylor tool life equation for selected tool materials (from M.P. Groover, Fundamentals of Modern Manufacturing, 5ª ed.)
Transcribed Image Text:a) Calculate the Material Removal Rate (MRR) (in in3 /s or mm3 /s). b) Compute MRR in part (a) by considering the following cases Feed (f) in/rev Rotational Speed (N) in RPM MRR 0.02 1100 ? 0.03 1000 ? 0.04 900 ? c) What can you conclude from (b) as far as MRR variations? d) Use the Taylor Tool Life equation to estimate the tool life (in minutes) for this operation. Use the table below to pick appropriate values of C and n (the flashlight material is titanium and the tools are high-speed steel). How many such holes would you be able to drill before the tool needs to be replaced? C Nonsteel Cutting Steel Cutting Tool Material m/min (f/min) m/min f/min Plain carbon tool steel 0.1 70 20 (200) (350) (2700) 60 High-speed steel 0.125 120 70 200 Cemented carbide 0.25 900 500 1500 Cermet 0.25 600 2000 Coated carbide 0.25 700 2200 Ceramic 0.6 3000 10,000 Compiled from (4). [9), and other sources. The parameter values are approximated for turning at feed 0.25 mm/rev (0.010 in/rev) and depth = 2.5 mm (0.100 in). Nonsteel cutting refers to easy-to-machine metals such as aluminum, brass, and cast iron. Steel cutting refers to the machining of mild (unhardened) steel. It should be noted that significant variations in these values can be expected in practice. Table 1. Representative values of n and C in the Taylor tool life equation for selected tool materials (from M.P. Groover, Fundamentals of Modern Manufacturing, 5ª ed.)
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