Find the speed range ratio for the drilling machine spindle if the minimum and maximum diameters of drills used are 5 mm and 25 mm respectively and if the mach inability indices for the work materials are 120 (brass) and 40 (alloy steel)

Find the speed range ratio for the drilling machine spindle if the min

1.	Find the speed range ratio for the drilling machine spindle if the minimum and maximum diameters of drills used are 5 mm and 25 mm respectively and if the mach inability indices for the work materials are 120 (brass) and 40 (alloy steel)
A.	3/5
B.	5/3
C.	5
D.	15
Answer» C. 5

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Find the speed range ratio for the drilling machine spindle if the minimum and maximum diameters of drills used are 5 mm and 25 mm respectively and if the mach inability indices for the work materials are 120 (brass) and 40 (alloy steel)

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