Small Sawmills: Their Equipment, Construction, and OperationU.S. Department of Agriculture, 1918 - 68 Seiten |
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Seite 6
... pound them through the timber and over rocks , stumps , and mud holes . Discharge such a person at once . Teams when properly handled will be 100 per cent efficient all the time and thrive . High wages do not always secure the service ...
... pound them through the timber and over rocks , stumps , and mud holes . Discharge such a person at once . Teams when properly handled will be 100 per cent efficient all the time and thrive . High wages do not always secure the service ...
Seite 13
... pounds . Way timbers are 450 pounds extra . Extra equipment : Manila - rope drive with sheaves , add . Wire - cable drive , add___ For each additional foot of carriage , add_ . For each additional foot of set shaft , add___ Trackway ...
... pounds . Way timbers are 450 pounds extra . Extra equipment : Manila - rope drive with sheaves , add . Wire - cable drive , add___ For each additional foot of carriage , add_ . For each additional foot of set shaft , add___ Trackway ...
Seite 14
... pounds ) . Top mandrel is 11 inches diameter and made for standard saws with 2 - inch hole and ğ - inch pin holes on 3 - inch circle . Weight , 1,075 pounds . The average cost of setting up the mill is- Mill ( with machinery on the ...
... pounds ) . Top mandrel is 11 inches diameter and made for standard saws with 2 - inch hole and ğ - inch pin holes on 3 - inch circle . Weight , 1,075 pounds . The average cost of setting up the mill is- Mill ( with machinery on the ...
Seite 15
... pounds ; double roll , 1,400 pounds . PLANER . Planers are built in two sizes , to surface up to 16 inches and 20 inches wide and from inch to 6 inches thick , with or without countershaft , as ordered . No belting is furnished . Feed ...
... pounds ; double roll , 1,400 pounds . PLANER . Planers are built in two sizes , to surface up to 16 inches and 20 inches wide and from inch to 6 inches thick , with or without countershaft , as ordered . No belting is furnished . Feed ...
Seite 16
... pounds . No. 4 machine , for boards from 8 to 24 feet , weight 3,110 pounds__ CUT - OFF SAW . Timbers in main frame 31 by 31 inches . Timbers in table frame 2 by 4 inches . Mandrel ( steel ) 1 % inches for saw with 11 inch hole ...
... pounds . No. 4 machine , for boards from 8 to 24 feet , weight 3,110 pounds__ CUT - OFF SAW . Timbers in main frame 31 by 31 inches . Timbers in table frame 2 by 4 inches . Mandrel ( steel ) 1 % inches for saw with 11 inch hole ...
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12 inches 20 inches axes bevel blow-off blow-off valve boiler boxes bunk cant hooks capacity carriage chain chute circular saw class A mill cost crosscut saw cubic cylinder Discount dray drive edge edger engine and boiler equipment f. o. b. Chicago feed feet long feet per day friction front gang grade hammer handled haul head blocks head saw holes horse horsepower husk frame inches wide inserted-tooth keep kerf Lath length load lumber machine Mandrel pulley mill operator pile pinion planer portable mill pounds pressure properly pump rack rack and pinion raker revolutions per minute rip saws road roll round safety valve Sawdust conveyors sawmill sawyers scale set shaft Shingle skids skidway slabs small mill solid-tooth spark arrester speed steam steel straight straight edge suction pipe surface swamp hook teamster tooth track tree truck tubes usually water gauge weight wheel width wood
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Seite 57 - To find the pressure in pounds per square inch of a column of water, multiply the height of the column in feet by .434. Approximately, we say that every foot elevation is equal to % Ib. pressure per square inch ; this allows for ordinary friction. To find the diameter of a pump cylinder...
Seite 19 - Raise the safety valves cautiously and frequently, as they are liable to become fast In their seats and useless for the purpose intended. 10.
Seite 62 - Circular pitch is the distance from the center of one tooth to the center of the next, measured along the pitch line.
Seite 58 - To compute the capacity of pumping engines, multiply the area of water piston, in inches, by the distance it travels, in inches, in a given time. Deduct 3 per cent for slip and rod displacement. The product divided by 231 gives the number of gallons in time named. To find the...
Seite 61 - Constant of an engine is found by multiplying the area of the piston in square inches by the speed of the piston in feet per minute and dividing the product by 33,000.
Seite 57 - To find the velocity in feet per minute necessary to discharge a given volume of water or liquid in a given time, multiply the number of cubic feet of water by 144, and divide the product by the area of the pipe in inches.
Seite 24 - 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 : Where narrow belts are to be run over small pulleys, 15 feet is a good average, the belt having a sag of i£ to 2 inches.
Seite 58 - Steam is steam containing free moisture in the form of spray or mist, and has the same temperature as dry saturated steam of the same pressure. Saturated Steam is steam in its normal state, that is, steam whose temperature is that due to its pressure; by which is meant steam at the same temperature as that of the water from which it was generated and upon which it rests. Superheated Steam is steam at a temperature above that due to its pressure after leaving the liquid from which it is generated.
Seite 63 - ... the saw line after a cut has been made. The carriage frame is mounted on trucks which travel on tracks, the carriage being actuated by a steam feed, a cable, or a rack-and-pinion device, which propels it back and forth past the head-saw.
Seite 24 - ... 2£ to 4 inches. For main belts working on very large pulleys, the distance should be 25 to 30 feet, the belts working well with a sag of 4 to 5 inches.