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An electric motor running at 1200 rpm drives a punch press shaft at 100 rpm by means of a 130 mm wide and 8 mm thick belt. When the clutch is engaged, the belt slips. To correct this condition, an idler pulley was installed to increase the angle of contact, but the same belt and pulley were used. The original contact angle on the 200 mm motor pulley is 160 degrees. The original tension ratio is 2.4 and the net tension is 12 N/mm of the belt width. If an increase in transmission capacity of 20 % will prevent slippage, determine the new angle of contact.

An electric motor running at 1200 rpm drives a punch press shaft at 100 rpm by means of a 130 mm wide and 8 mm thick belt. When the clutch is engaged, the belt slips. To correct this condition, an idler pulley was installed to increase the angle of contact, but the same belt and pulley were used. The original contact angle on the 200 mm motor pulley is 160 degrees. The original tension ratio is 2.4 and the net tension is 12 N/mm of the belt width. If an increase in transmission capacity of 20 % will prevent slippage, determine the new angle of contact.

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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An electric motor running at 1200 rpm drives a punch press shaft at 100 rpm by means of a 130 mm wide and 8 mm thick belt. When the clutch is engaged, the belt slips. To correct this condition, an idler pulley was installed to increase the angle of contact, but the same belt and pulley were used. The original contact angle on the 200 mm motor pulley is 160 degrees. The original tension ratio is 2.4 and the net tension is 12 N/mm of the belt width. If an increase in transmission capacity of 20 % will prevent slippage, determine the new angle of contact.

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