Railway and Locomotive Engineering . e cost of renewal. One ofthe reasons why this form of wheel con-struction will appeal to mechanical men is that there is not much machinework involved. There is, of course,some rough turning on the tire to in-sure its being round, and as the wheelcenters are cast and are not perfectlycircular, a little grinding or perhaps alittle rough turning is all that is neces-sary. There are no bolts to work looseor break, and the tire is not fused orshrunk on. It is simply wedged firmlyin place on the wheel center, and thecast iron wedges are held permanently,in place
Railway and Locomotive Engineering . e cost of renewal. One ofthe reasons why this form of wheel con-struction will appeal to mechanical men is that there is not much machinework involved. There is, of course,some rough turning on the tire to in-sure its being round, and as the wheelcenters are cast and are not perfectlycircular, a little grinding or perhaps alittle rough turning is all that is neces-sary. There are no bolts to work looseor break, and the tire is not fused orshrunk on. It is simply wedged firmlyin place on the wheel center, and thecast iron wedges are held permanently,in place by means of the sprags at thelarge end of each wedge, and thesesprags prevent the tire turning on thewheel center, and the sprags are inca-pable of movement, as they are per-manently secured by being imbeddedin cast iron. The application of a new tire can bemade witliout the aid of special machinery, and unskilled labor may be em-ployed on the job. The cast steelwheel center does not wear out and mayreceive a new hub or a new .SECTIONS OF THE SIKJVMNG CONSTRUCTION. January, 1911. RAILWAY AND LOCOMOTIVE ENGINEERING. General Correspondence Test for Loose : I see a note on page 452 of yourNovember number about Test forLoose Wheels. I think that the en-closed photograph and brief descriptionof the press we use at Doncaster fora similar purpose may be of interest toyour readers. The photograph shows asimple rig used at the Doncaster Worksof the Great Northern Railway ofEngland for testing carriage press was designed and made atDoncaster. It applies a back pressureof 50 tons, the diameter of ram beingsuch as to give this pressure when sup-plied from the shop hydraulic main at1,500 lbs. per square inch. The pressuregauge is used as an indication that thefull pressure is there for each test. The wheels are turned on the tableshown in front of the press and as soonas they get to the taper part of thetrestles they roll upon their journals
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyork, bookyear19
