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An Interesting Logging Problem 



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\hu\e Arrowro.-k djim iii tlio li:i»in of the Itoiso rivi-r. Malio, it is 

 ostiinuUd tlint thorc arc 3,000,000,000 feet of mcrclmntablo tiiiilxr. 

 Siiwea into luiiilicr worth, suy $12 a tlioiignn.l, tins woiilil ropresoiit 

 a value of $:1C>,000,000. It is owned by the United SUtes (joveriiinent, 

 jlie }: .rto Lumber Coinjinny and n number of others witli 



s,„„i . _~. This timber is to bo cut in the immediate future, 



driven douu the Boise river and converted into lumber at tlie mills 

 fourteen miles Ixdow tlio Arrowroek dam and just outside the city 

 of Boise. 



Here at the big dam, then, is presented a knotty little problem,— 

 to lift these logs from the reservoir, carry thorn over the crest 2C0 

 feet above the bed of the river, and deliver them in good condition 

 in the stream below. Nothing would be permitted, of course, to 

 interfere with the main object of the dam, — the impounding of the 

 244.000 acre-feet of water demanded for the irrigation of 240,000 

 acres of rich soil in the Boise valley. But n.s the dam backs the 

 water for a distance of eighteen miles, converting the river channel 

 into a reservoir, and including both branches of the stream, it pro- 

 vides ideal means for the driving of logs. It was early agreed that 

 some scheme must be devised for lifting them over tlio dam. 



Under the direct supervision of Engineer Charles H. Paul his as- 

 sistant, Walter R. Young, designed an equipment based on principles 

 used where scientific logging is done. This has a maximum capacity 

 of 60.000,000 feet for the period of sixty days in summer when the 

 water in the reservoir is within forty-five feet or less of the top of 



tlic .1:1111. .\t tlll^ i:.t. it 1-. r-iiii 1 will l;ikp fifty years to 



lift over the entire ;i,UUU,Uli0,U00 feet. 



By this equipment, located at the extreme southern end of the 

 dani, logs of any size or length will bo taken out of the reservoir by 

 means of a cable lift and deposited on the concrete deck on the top 

 of the dam. From this deck they will be fed by a stop and loader 

 to power-driven spiked rolls one at n time, the speed under the con- 

 trol of the operator. These rolls will carry the logs across the dam 

 and turn them over to a bull-chain with spurs or teeth to prevent 

 sliding. The chain will take them down a 62'{. per cent slope at a 

 speed of eighty-five feet a minute ami discharge tliem into a gravity 

 chute through which they will slide into the river below. 



As this structure must withstand the elements for many years it is 

 built of the best of concrete and steel. It is unique in government 

 construction. Power for its operation is now develojied by the govern- 

 ment at the diversion dam twelve miles below. Later a power plant 

 is to be established at Arrowroek immediately under the dam. 



This dam, the highest in the world, 348.5 feet from the bottom of 

 the foundation to the crest, is to be dedicated with a barbecue and 

 harvest home in Boise, October 4. It is finished more than a year 

 in advance of the time specified at the beginning and at a cost of 

 $2,000,000 less than t'-e estimates. By storing water this season, the 

 driest in history, it saved the crops on 100,000 acres and practically 

 paid for itself. 



vS" Experience Talks on Woodworking -^ 



In the operation of matchers, as in all other machines, the operator 

 should try to learn all he can about the machine he is operating. 

 Many times he can correct some minor trouble, saving time and 

 repairs. 



The machine man is responsible only for neglected things. He 

 has to divide his time in different parts of the mill. Necessarily he 

 must be a thorough mechanic and one who can run over a machine 

 quickly. Nuts, bolts, screws, springs and keys are just as important 

 in their places as knives on the heads. If neglected, trouble is the 

 result. 



One should never be stingy with oil. Use the best quality and 

 before it is really needed. If a bearing burns out it not only ruins 

 the metal but it hardens the surface of the journal so that it will 

 never run so well again. Watch the belts. The best time to look 

 over belts and other things, so that every defect may be found is 

 before shutting down every evening. A little inspection saves belts, 

 shafts and pulleys. 



Be careful of the use of jointer and grinder. Don't assume that 

 the grinder will stand everything. Touch up the knives lightly, and 

 save metal. Get all the good you can out of the steel knives by the 

 care you use on them. Set the heads before starting the work. Very 

 often the operator starts the stock in before the setting is complete, 

 putting so much strain on sideheads or cylinders that something is 

 liable to break. Once this happens the lieads will never do as good 

 work as before. Keep the rolls down just enough and start it up. 



at the planers and other heavy machines. When you find oil running 

 down from the boxes, the sides of the macliine covered with it and 

 perhaps the floor soaked with it, and the boxes far from running cool, 

 invariably the cause is a sprung arbor. 



You may use the best metal obtainable and do almost a perfect job 

 of easting the boxes, yet it is not a difficult jiroblem to understand 

 what the arbor will do when sprung, especially if it is running in an 

 8 or 10-inch journal. Screwing the cap down where it belongs will 

 make it too tight, neither can you have it loose. The result is you 

 keep your cap down about as tight as you dare and by using oil 

 abundantly manage to get along. The most perfect box cannot be 

 scraped to fit an arbor that has been sprung. 



The man who refuses to install safeguards for machines, or safe- 

 guarded machinery, is a criminal, and the man who neglects to use 

 them whenever possible is worse. All admit there is too much money 

 spent in lawsuits over accidents, and then too many go right ahead 

 and spend more at it. 



It is no longer a question of the electric motor being a good thing; 

 it is simply a question of how far this good thing can be carried in 

 the wav of individual units. 



Hot metal should never be poured directly on a machine arbor. 

 Have a duplicate shaft or turn a mandrel of wood ; if you can 't have 

 either, then at least warm the arbor. Pouring directly on it wiU do 

 the arbor no good, especially if it is heavy and of high speed; for 

 instance, a 30 or 36-inch planer head. This will spring very easily 

 and may be so slight as to not be noticeable. Once the damage is 

 done it cannot be balanced up in the first machine shop you come to, 

 neither does every machinist understand it. 



There may be some who will say they never use either a duplicate 

 shaft or wood mandrel. Just walk through a machine room and look 



Be fair with your employes. They are luiman and enjoy a few words 



of praise when it is earned. When blame is to be given, do not do 



it in public, for that means a needless humiliation that will cause 

 resentment and bad feeling. 



The advantage of a glass oil cup over a solid metal one is that you 

 can see at a glance whether or not the glass cup has enough oil 

 in it. 



Climbing over a' pile of sawdust and shavings may not be much of 

 a job, but it is not a much greater one to clean it up. Climbing over, 

 however, is exertion doubly wasted, while cleaning up is a good job 

 well done. 



