An Essay on the Teeth of Wheels: Comprehending Principles, and Their Application in Practice, to Millwork and Other Machinery. With Numerous FiguresWilliam Savage, 1808 - 164 páginas |
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Página 135
... as appear to have worn too ra pidly , are marked , which may tend to dis- cover the limit in point of breadth . Column 1 Contains the Horse's power . 2 3 5 Appendix . 135 Explanation of the Table of Wheels actual use in Mill-work,
... as appear to have worn too ra pidly , are marked , which may tend to dis- cover the limit in point of breadth . Column 1 Contains the Horse's power . 2 3 5 Appendix . 135 Explanation of the Table of Wheels actual use in Mill-work,
Página 166
... marked by b d on the figure . In the same manner , we may mark the value of 1 , , 2,3,5,6 ounces . These points are marked abcef , and the straight line A B passes through them all , and shews the regular pro- gress of the proportion ...
... marked by b d on the figure . In the same manner , we may mark the value of 1 , , 2,3,5,6 ounces . These points are marked abcef , and the straight line A B passes through them all , and shews the regular pro- gress of the proportion ...
Página 167
... marked in fi- gure 2d by a opposite to 1 on both scales , by b opposite 2 on the scale of time , A D and 4 on that of motion , A C by c , opposite 3 , on A D , and 9 on A C , & c . the line A B pass- ing through these points forms a ...
... marked in fi- gure 2d by a opposite to 1 on both scales , by b opposite 2 on the scale of time , A D and 4 on that of motion , A C by c , opposite 3 , on A D , and 9 on A C , & c . the line A B pass- ing through these points forms a ...
Página 173
... observed , that the curves Y and Z intersect each other , for all the tables on the pitch line marked 3 inches , because that is the standard . ( See 1st Essay , p . 137 ) . 18. - 2d , The curves , continued from 1 Appendix . 173.
... observed , that the curves Y and Z intersect each other , for all the tables on the pitch line marked 3 inches , because that is the standard . ( See 1st Essay , p . 137 ) . 18. - 2d , The curves , continued from 1 Appendix . 173.
Página 174
... marked O , being the commencement of the scale of pitches , and this part of the curve gives the horse's power equal to any fraction of an inch . 19. - 3d , It was already observed , p . 139 , that durability as well as strength ...
... marked O , being the commencement of the scale of pitches , and this part of the curve gives the horse's power equal to any fraction of an inch . 19. - 3d , It was already observed , p . 139 , that durability as well as strength ...
Otras ediciones - Ver todas
An Essay on the Teeth of Wheels: Comprehending Principles, and Their ... Robertson Buchanan Sin vista previa disponible - 2015 |
An Essay on the Teeth of Wheels: Comprehending Principles, and Their ... Robertson Buchanan Sin vista previa disponible - 2018 |
Términos y frases comunes
bevel geer Boulton and Watt Breadth of teeth cast iron circumference cloid Column Z contains conducted cone curve cycloid double each pitch double the pitch draw epicy feet per second figure following tables force friction Horse Mill Horse's power inches in breadth inversely length line of centres mills Millwork millwright motion moving nion number of horses Number of teeth observed perpendicular Pitch in inches pitch line pitch of three point of contact practice principles proportional circles Proportionate to H proposition resistance rience ring rule spur geer straight line strength and durability strength in horses suppose Table of Pitches Table of Wheels teeth nine inches teeth of wheels thickness three feet three inch pitch tion tooth touch Value of strength valued in horses velocity of 11 velocity of three W X Y Z Pitch water wheels wheel and pinion Wheels in actual
Pasajes populares
Página 111 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Página 112 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Página 99 - ... circle. It has been supposed by some of the best authors that the epicycloidal tooth has also the advantage of completely avoiding friction ; this is however by no means true, and it is even impracticable to invent any form for the teeth of a wheel, which will enable them to act on other teeth without friction. In order to diminish it as much as possible, the teeth must be as small and as numerous as is consistent with strength and durability ; for the effect of friction always increases with...
Página 16 - For when the acting parts of a machine are not truly formed, it may he so loaded as just to be in equilibrio with its work in the most favourable situation of its parts, but when it changes into a less favourable situation, the machine will stop, or at least, stagger, hobble, or work unequally. The best figure, therefore, which can be given to the teeth, is that which shall cause them always to act equally and similarly, in situations equally favourable, and which shall consequently give the machine...
Página 129 - Stress is inversely as the Velocity.^ " For example — if the pitch lines of one pair of wheels be moving at the rate of 6 feet in a second, and another pair of wheels, in every other respect under the same circumstances, be moving at the rate of 3 feet in a second, the stress on the latter is double of that on the former " Of arranging the Numbers of Wheel-Worlt.
Página 99 - ... the actual resistance is not at all increased by increasing the relative velocity; but the effect of that resistance, in retarding the motion of the wheels, may be shown, from the general laws of mechanics, to be proportional to the relative velocity thus ascertained. When it is possible to make one wheel act on teeth fixed in the concave surface of another, the friction may be thus diminished in the proportion of the difference of the diameters to their sum. " If the face of the teeth, where...
Página 79 - A geometrical curve, of which the genesis may be conceived by imagining a nail in the circumference of a wheel : the line which the nail describes in the air, while the wheel revolves in a right line, is the cycloid.
Página 126 - ... wheels. For it is to be remembered, that we are not so much here in search of truths of curious or profound mathematical speculation, as of that kind of evidence, of which the subject admits, and which may be sufficiently satisfactory for any practical purpose.
Página 139 - The thickness of the teeth in each of the lines is varied one-tenth of an inch. The breadth of the teeth is always four times as much as their thickness. The strength of the teeth is ascertained by multiplying the square of their thickness into their breadth, taken in inches and tenths, &c. The pitch is found by multiplying the thickness of the teeth by 2'1. The number that represents the strength of the teeth, will also represent the number of horses' power, at a velocity of about four feet per...
Página 98 - In the first volume of the same work, he makes the following judicious observations on our present subject : «* It has been supposed by some of the best authors that the epicycloidal tooth ,has also the advantage of completely avoiding friction ; this is however by no means true, and it is even impracticable to invent any form for the teeth of a wheel, which will enable them to act on other teeth without friction. " In order to diminish it as much as possible, the teeth must be as small and as numerous...