Shop Mathematics ...: Shop arithmeticMcGraw-Hill book Company, 1912 |
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Σελίδα 128
... effective will equal the theoretical force . Example : Calculate the actual pull required to lift 600 lb. with a differential hoist having 10 and 8 in . pulleys and an efficiency of 30 % . D = 10 in . d = 8 in . D - d = 2 in . 1 2 of ...
... effective will equal the theoretical force . Example : Calculate the actual pull required to lift 600 lb. with a differential hoist having 10 and 8 in . pulleys and an efficiency of 30 % . D = 10 in . d = 8 in . D - d = 2 in . 1 2 of ...
Σελίδα 134
... effective , the remaining 82 % being all lost in friction . actual weight lifted is , therefore , only 18 % of 16950 lb. or 3051 lb. The 102. Efficiencies . - In explaining the machines of this chapter and of Chapters XIII and XIV , it ...
... effective , the remaining 82 % being all lost in friction . actual weight lifted is , therefore , only 18 % of 16950 lb. or 3051 lb. The 102. Efficiencies . - In explaining the machines of this chapter and of Chapters XIII and XIV , it ...
Σελίδα 135
... effective in accomplishing the work to be done . Of the whole force applied , the per cent which this effective force represents is called the Efficiency . If the efficiency is less than 50 % , it shows that the friction absorbs more ...
... effective in accomplishing the work to be done . Of the whole force applied , the per cent which this effective force represents is called the Efficiency . If the efficiency is less than 50 % , it shows that the friction absorbs more ...
Σελίδα 138
... effective pull of the belt times the distance in feet which the belt travels . The work done in hoisting an elevator is the weight of the cage and of the load it carries times the height of the lift . Numerous other illustrations of ...
... effective pull of the belt times the distance in feet which the belt travels . The work done in hoisting an elevator is the weight of the cage and of the load it carries times the height of the lift . Numerous other illustrations of ...
Σελίδα 139
... Effective Pull , as it is called ) is the difference in tension between the tight and the slack sides of the belt . The effective pull that can be allowed in a belt depends prima- rily on the width , thickness , and strength of the ...
... Effective Pull , as it is called ) is the difference in tension between the tight and the slack sides of the belt . The effective pull that can be allowed in a belt depends prima- rily on the width , thickness , and strength of the ...
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
Answer bolt brake calculate cast iron Centigrade cents CHAPTER cipher circle circumference column compression countershaft crank Cube root root Cube Square Cube cylinder decimal places decimal point denominator diameter difference distance divided dividend divisor dollar driven gear efficiency equal Example exerted Explanation Fahrenheit figure foot-pounds force arm formula fulcrum given number gives heat Hence hoist horse-power improper fraction inclined plane lathe lead screw length lever lift lineshaft load machine mean effective pressure mechanical advantage mechanical efficiency mixed number movable block move the decimal multiply necessary numbers of teeth piece pounds PROBLEMS pulley pump pyrometer quotient radius raised reduced revolutions per minute ROOTS OF NUMBERS.-Continued rope shaft sheave shown in Fig specific gravity speed ratio Square Cube root Square Cube Square square inch square root steam engine steel stress stroke subtract temperature threads per inch trial divisor weight arm wheel whole number
Δημοφιλή αποσπάσματα
Σελίδα 7 - TIME 60 seconds (sec.) = 1 minute (min.) 60 minutes = 1 hour (hr.) 24 hours = 1 day (da.) 7 days = 1 week (wk.) 365 days = 1 common year...
Σελίδα 89 - Written as a formula this would read This can be illustrated by drawing squares on each side, as in Fig. 29, and noting that the area of the square on the hypotenuse is equal to the sum of the areas of the other two.
Σελίδα 38 - Subtract the number of decimal places in the divisor from the number of decimal places in the dividend, and point off as many decimal places in the quotient as there are units in the remainder thus found.
Σελίδα 146 - MEP in pounds per square inch; A = area of piston in square inches; L = length of stroke in feet ; N= number of working strokes per minute.
Σελίδα 37 - To divide by 10, move the decimal point one place to the left. To divide by 100, move the decimal. point two places to the left, and so on for other powers of 10.
Σελίδα 3 - An Improper Fraction is one whose numerator is equal to, or greater than, the denominator; as, f, f.
Σελίδα 133 - Fig. 49. We will solve this problem partly graphically and partly by calculation. The first step is to find how fast the crank pin D is moving. For one turn of the crank, D travels through a distance equal to the circumference of a circle whose radius is R, that is, a distance of 2'ffTi.
Σελίδα 38 - EULE.—Divide as in whole numbers, and point off as many decimal places in the quotient as the number of decimal places in the dividend exceeds the number in the divisor.
Σελίδα 5 - When the numerator is less than the denominator, the value of the fraction is less than 1. 5th. When the numerator is equal to the denominator, the value of the fraction is equal to 1. 6th. When the numerator is greater than the denominator, the value of the fraction is greater than 1.
Σελίδα 61 - In any proportion, the product of the means is equal to the product of the extremes.