A Treatise on the Use of Belting for the Transmission of Power |
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Common terms and phrases
adhesion angle applied arc of contact band belt and pulley belt running breadth cast-iron centre centrifugal force circumference co-efficient of friction cord D. K. Clark distance double belts driving power driving pulley drum dynamometers edges engine equal experiments face feet diameter feet of belt feet per minute flat belt fly-wheel formula Franklin Institute give given greater grooves gutta-percha horizontal horse power inch of width inches diameter inches wide increased iron pulley kilogrammes lacing length less line shaft load machine machinery main belt mill millimetres minute per horse-power motion ordinary pounds practice pressure proportion ratio resistance revolutions per minute rivets rubber rule shaft single belt slack small pulley square feet square inch strain straps strength stretch strips surface tensile strength tension thickness tight tightening transmission of power transmitting power Unbalanced Weight velocity wheels width of belt wire rope
Popular passages
Page 57 - J-£ the way through from that side. It is therefore desirable to run the grain (hair) side on the pulley, in order that the strongest part of the belt may be subject to the least wear. The flesh side is not...
Page 111 - The working adhesion of a belt to the pulley will be in proportion both to the number of square inches of belt contact with the surface of the smaller pulley, and also to the arc of the circumference of the pulley embraced by the belt.
Page 109 - Circumstance.0 generally, have much to do with the arrangement, and the engineer or machinist must use his judgment, making all things conform, as far as may be, to general principles. This distance should be such as to allow of a gentle sag to the belt when in motion. A general rule may be stated thus : RULE.
Page 111 - Having properly arranged the machinery for the reception of the belts, the next thing to be determined is the length and width of the belts. When it is not convenient to measure with the...
Page 62 - Short belts require to be tighter than long ones. A long belt, working horizontally, increases the tension by its own weight, acting in the curve formed between the pulleys. " One of the properties of this curve is to make the tension greater than is due to the simple weight of the belt ; that is greater than when the belt is hanging vertically ; besides it never loses contact.
Page viii - PULLEYS. la entirely maintained by the frictional adhesion between them, it may happen that it may occasionally fail through the band sliding on the pulley. This, if not excessive, is an advantageous property of the contrivance, because it enables the machinery to give way when unusual obstructions or resistances are opposed to it, and so prevents breakage and accident. For example, if the pulley to which motion is communicated were to be suddenly stopped, the driving pulley, instead of receiving...
Page 113 - In punching a belt for lacing it is desirable to use an oval punch, the longer diameter of the punch...
Page 37 - I was at first apprehensive of burning the leather with the degree of heat applied, but I have since found that there is not the least danger of it if the leather is perfectly dry. To test the degree of heat the dry leather would bear without burning, in the composition, i placed a kettle of it over a blacksmith's fire, and after melting it, I put in a coil of two inch belting, about sixteen feet long and boiled it forty-five minutes with the greatest degree of heat I could produce by blowing the...
Page 38 - In many mills a practice prevails which is very injurious to the durability of the belts, and ought to be abandoned. That is, the practice of applying currier's oil, or neat's foot oil to the belts, to prevent them from slipping; for the oil opens the pores of the leather, destroys the adhesion of its parts, and, in a very short time, renders it flaccid and rotten, and a belt will not last half so long stuffed with oil as with the composition before named. The experiment is easily tried, and it will...