The Tractor field book; with power farm equipment specifications

Description

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 Excerpt: ...is the center of the pulley, the belt usually remains there. The capacity of a belt to transmit power depends on Its velocity, an argument for high belt speeds, and the average of the tension on the two sides. As the tension depends on the friction on the pulley, it is apparent that a wide belt in general will give better results than a narrow one. Thus in choosing between a narrower belt of more plies and a wider one of fewer, choose the wider one. Trouble from belt slipping also can be overcome by increasing the size of the pulleys on both driving motor and driven machines, care being taken to maintain the proper relation between the two pulleys. Canvas and rubber belting is made from two-ply up, four-ply being considered the equivalent ol leather belting. s SCRAPING BEARINGS ON VERTICAL MOTORS BY GEO. P. COGDAL. The common practice In bearing scraping or fitting is to turn the motor upside down, place Prussian blue on the journals of the crankshaft and then proceed to bolt the bearing caps on so tight that the crankshaft can just barely be rotated in the bearings. The cap is then taken off and the high spots scraped on both the cap and crankcase bearings. The crankshaft journals are again blued and the cap bearings are bolted tight the same as stated above. Now with this process it can be plainly seen that the crankcase bearings will acquire a perfect bearing due to the fact that no matter how tight the cap bearing is bolted on, the shape of the crankcase bearing will not be changed. (Pig. 1). on the power stroke, the cap bearings of the main journals are receiving the load of both forces and the upper or crankcase bearings are receiving practically no load or wear. If the cap bearings are to receive practically all the load, they must be made a perfect ...