DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Textbook Question
Chapter 25, Problem 7P
Assume that you are drilling eight holes, equally spaced in a bolt-hole circle. That is, there would be holes at 1,2, 3, 6, and 9 0'clock and four more holes equally spaced between them. The diameter of the bolt-hole circle is 6 in. The designer says that the holes must be 45 degrees ±1 degree from each other around the circle.
- Compute the tolerance between hole centers.
- Do you think a typical multiple-spindle drill setup could be used to make this bolt circle-using eight drills all at once? Why or why not?
- Do you think that the use of a jig may help improve the situation?
- Do you think a CNC drilling process could do the holes best?
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Design a jig to drill 8 holes of 10 mm diameter in a PCD of 240 mm circular plate of 300 mm outer diameter with 20 mm thickness
1. If a machinist wanted to drill a % inch hole in a piece of machine steel using a high speed steel
drill. At what speed in revolutions per minute should he operate the drill press?
2. Find the revolutions per minute of an 8 mm drill if it is used to cut an aluminum workpiece using
a high carbon steel drill.
3. The rpm setting of the drill press is set to 600 rpm. What is the maximum diameter in inches of a
high speed drill if it is used to drill a tool steel material?
4. A drill press has the following rpm settings; 350, 600, 1100, & 1600. What rpm setting must be
used if a 15 mm high speed steel drill is used to cut brass workpiece?
5.
A machine operator drills a hole of a 3/8 inch diameter to a stainless steel using a carbon steel
drill. He sets the drill press rpm setting to 900 rpm. Is he operating at correct setting? If not,
then what must be the correct rpm setting considering that the machine has the following rpm
settings of 300, 600, 900, 1200, and 1800?
Hello Please Answer this question, Thank you very much
Chapter 25 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 25 - What functions are performed by the flutes on a...Ch. 25 - What determines the rake angle of a drill? See...Ch. 25 - Basically, what determines what helix angle a...Ch. 25 - When a large-diameter hole is to be drilled, why...Ch. 25 - Equation 25.4 for the MRR for drilling can be...Ch. 25 - Are the recommended surface speeds for spade...Ch. 25 - What can happen when an improperly ground drill is...Ch. 25 - Why are many drilled holes oversize with respect...Ch. 25 - What are the two primary functions of a...Ch. 25 - What is the function of the margins on a twist...
Ch. 25 - What factors tend to cause a drill to drift off...Ch. 25 - The drill shown in Figure 25.13 has coolant...Ch. 25 - Prob. 13RQCh. 25 - Why do cutting fluids for drilling usually have...Ch. 25 - How does a gang-drilling machine differ from a...Ch. 25 - Prob. 16RQCh. 25 - How does the thrust force vary with feed? Why?Ch. 25 - Holding the workpiece by hand when drilling is not...Ch. 25 - Prob. 19RQCh. 25 - In terms of thrust, what is unusual about the...Ch. 25 - Prob. 21RQCh. 25 - Prob. 22RQCh. 25 - What are the primary purposes of reaming?Ch. 25 - What are the advantages of shell reamers?Ch. 25 - A drill that operated satisfactorily for drilling...Ch. 25 - What precautionary procedures should be used when...Ch. 25 - What is the advantage of a spade drill? Is it...Ch. 25 - Prob. 28RQCh. 25 - Why does drill feed increase with drill size?Ch. 25 - Suppose you specified a drilling feed rate that...Ch. 25 - Suppose you wanted to drill a 1.5-in.-diameter...Ch. 25 - How much time will be required to drill the hole...Ch. 25 - What is the metal removal rate when a...Ch. 25 - If the specific horsepower for the steel in...Ch. 25 - If the specific power of an AISI 1020 steel of...Ch. 25 - Prob. 6PCh. 25 - Assume that you are drilling eight holes, equally...Ch. 25 - What machining difficulties should this process...Ch. 25 - Why were the distances between the holes too...
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HOME SHOP JIGS & FIXTURES PART 1, TYPES OF JIGS & ACCESSORIES AND THE THEORIE BEHIND THE TOOLS; Author: THATLAZYMACHINIST;https://www.youtube.com/watch?v=EXYqi42JimI;License: Standard Youtube License