Solve 18,19&20 please Chapter 9 Drilling and Operations and MachinesMultiple Choice Questions14. Which is not characteristic of twist drills:A. they can be resharpened easilyB. they are flat cutting toolsC. they are commonly made of HSSD. they are somewhat flexible15. The mounting end of a tool is called itsA. marginB. shankC. webD. flute16. Which of the following drills is a good choice to use when creating a 1/4-20 internal thread?A. 1/4B. Letter EС. 3/16D. #717. Small drill bits require:A. faster drill speeds and light feed ratesB. slower drill speedsC. faster plunge ratesD. heavy feed rates18. Which is not an equation for determining RPM:A. surface speed x 12 / pix diameter (in.)B. surface speed x 4/ diameter of object (in.)C. surface speed x 300 / diameter of object (mm)D. surface speed x pi / diameter of object (in.)nso y or19. You cannot determine the feed rate of a drill by the:A. size of drillB. depth of holeC. hole locationD. type of material20. Using the short formula, what is the proper RPM for a 1/2 inch drill bit using a surface speed of140 f/M?A. 4060В. 2000С. 1120D. 500

Answered: Image /qna-images/answer/e6b8746b-304e-43de-9d57-8f46131cac81.jpg

18. Which is not an equation for determining RPM: A. surface speed x 12/ pix diameter (in.) B. surface speed x 4/ diameter of object (in.) C. surface speed x 300/ diameter of object (mm) D. surface speed x pi/ diameter of object (in.) 19. You cannot determine the feed rate of a drill by the: A. size of drill B. depth of hole C. hole location D. type of material 20 Usine the short formula, what is the proper PRM for a 1/2 inch drill bit using a surface speed of

18. Which is not an equation for determining RPM: A. surface speed x 12/ pix diameter (in.) B. surface speed x 4/ diameter of object (in.) C. surface speed x 300/ diameter of object (mm) D. surface speed x pi/ diameter of object (in.) 19. You cannot determine the feed rate of a drill by the: A. size of drill B. depth of hole C. hole location D. type of material 20 Usine the short formula, what is the proper PRM for a 1/2 inch drill bit using a surface speed of

Precision Machining Technology (MindTap Course List)

2nd Edition

ISBN:9781285444543

Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Chapter5: Turning

Section5.3: Machining Operations On The Lathe

Problem 17RQ: What are two reasons boring may be selected to produce a hole instead of drilling and reaming?

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