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
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
Related questions
Question
Solve 18,19&20 please
Transcribed Image Text:Chapter 9 Drilling and Operations and Machines
Multiple Choice Questions
14. Which is not characteristic of twist drills:
A. they can be resharpened easily
B. they are flat cutting tools
C. they are commonly made of HSS
D. they are somewhat flexible
15. The mounting end of a tool is called its
A. margin
B. shank
C. web
D. flute
16. Which of the following drills is a good choice to use when creating a 1/4-20 internal thread?
A. 1/4
B. Letter E
С. 3/16
D. #7
17. Small drill bits require:
A. faster drill speeds and light feed rates
B. slower drill speeds
C. faster plunge rates
D. heavy feed rates
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.)
nso y or
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. Using the short formula, what is the proper RPM for a 1/2 inch drill bit using a surface speed of
140 f/M?
A. 4060
В. 2000
С. 1120
D. 500
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