By Herman Haeder
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Read or Download A Handbook On the Steam Engine: With Special Reference to Small and Medium-Sized Engines ; for the Use of Engine Makers, Mechanical Draughtsmen, Engineering Students, and Users of Steam Power PDF
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Extra info for A Handbook On the Steam Engine: With Special Reference to Small and Medium-Sized Engines ; for the Use of Engine Makers, Mechanical Draughtsmen, Engineering Students, and Users of Steam Power
Unsuitable material for the brasses or steps. 5. Insufficient 6. Blow s or Then means of lubrication. r let jars. i = P = d I p = v = diameter of journal in inches. length of journal in inches. speed in revolutions per minute. total pressure in Ibs. pressure per square inch in Ibs. periphery speed of the journal in feet per second, then, for ordinary engines : p < 270 p ; v ^ 840. figures do not give the limit to which the pressure and speed may be carried, the table gives some examples taken from engines which have been running for some years.
Fig. 175. be taken as from 6,720 to 11,200 Ibs. or 3 to 5 tons In order to avoid heating, the crank pin is usually larger than given by the above formula. Let p p -j the pres- sure per square inch in Ibs. on the surface of the crank pin v = ~= 1 speed of crank pin surface in feet 1. miatrtc, then for p ^ 1,130 Ibs. per square inch vp < 845. workmanship we may go higher see table on ordinary workmanship With very high class : page 63. Methods of fixing crank pins into A very usual method with cone and key (rig.
19 Fig. 52. ; an old type, but still used for large engines. Dimensions of the above Frames. DETAILS OF STEAM ENGINES. 20 ' -f FRAMES FOR SMALL ENGINES. 21 DETAILS OF STEAM ENGINES. 22 Frames for Medium and Large Engines. The bed plate frame as in page 19, fig. 51, was formerly largely used but now lias given place to the more modern types given below ; it has the advantage of taking firm hold of the foundation and still much used for winding engines of large Figs. 58 Figs. CO and and 59. 01, size.