Arizona republican., 1921-11-27

tIle ptdII anu uTdW up SPCCtA4SS1lAVA&S for the various machines necessary | to perform the operations required. l The total cost of the machinery. tools and special jigs was somewhat over $4,000,000. The Olds Motor 1 Works had the services of the best engineers in the employ of machinery manufacturers, many of them re- maining on the job at the plant while the machinery was being de. signed after Oldsmohile specified tions, and while it was being in stalled.
 The plant in which Oldsmobile en- zines are made is of the most modern, saw tooth, daylight con- struction, being 1000 feet long by 800 feet wide; and approximately 240.- coo square feet of floor space. The
 plant was constructed at cost Of nearly s2.00o.000 and is entirely
 modern and up to date in every re- spect. The machinery is so arranged that the various pieces pass by pro
 gressive steps from one operation to the next by gravity conveyer system, and no motion is lost due to trans
 ferring of material back and forth from one machine to another.
 Each part at each operation Is given 100 per cent inspection and | the part must be perfect and measure | up to blue prints before it passes on l to the next operation. This method l of inspection does away with the pos l sibility of a piece that does not 1 measure up to requirements being | nachined by the next workman in l line. This saves considerable eX- pense and keeps scrappage down to ! a minimum and eliminates the chance of imperfect parts getting into the motor. Any part not meeting the 1 inspection requirements is deflnteiy scrapped and carried away for good. It never has a chance to get into l salvage bin and perhaps to be worked
 up into a finished product later. It l has been found that this progressive l inspection system absolutely prevents
 parts reaching the assembly line that
 do not measure up 100 per cent per
 feet It also means a great saving
 in manufacturing costs, which even
 tually, of course, keeps down the cost
 of the finished engine and completed
 car
 Among the unusual and unique
 machines in operation in this plant there are several that stand out very , prominently, such as the cylinder rolling machines, the 7Tsspindle Foote , Bure Away drilling machine, and the
 crankshaft balancing machine. Space } does not permit going into detail or } the many machining operations ir } the manufacture of this motor bui } we would point out two very unusua and striking examples of advanced manufacturing processes, namely; r rolling of the cylinder bores, and l. balancing of crank shaft.
 , Rolling of Cylinder Bores 7 It has long been recognized tha- in motor building some means should D be devised which would insure a fin ! ished cylinder bore being perfectl, round from end to end and whicf s would insure a surface harder thar
 that obtained by open machining O. r grinding, the processes used hereto ' fore. It remained for OIdsmobil, e engineers to obtain the desired re e suits by the ingenious method O e rolling the cylinder bores. Thi ., is as follows: A central spindle f s surrounded by rolls which somewha t resemble roller bearings. Each rol
 is carefully measured with microme t ters so that the whole forms a tru e circle. This is made to the true sig }, of the desired cylinder bore and t previous machining operation on tn n cylinder walls allows from one-hal
 to three-quarters of a thousandtl C metal on the diameter to be com e pressed by rolling. The size of th
 
 y hardened master rolls. The resul el is that the roll, which works i It graphite and oil against the cylinde
 wall, congresses the metal by crowd 'f ing it back under expansion an e gives it hardness and polishe Ie smoothness which is unobtainable b II any other means or method. Tn l. result is true bore and longer If
 of cylinder walls
 le Absence of Vibration u The model AZ stock engine on bloc IS test at General Motors laboratorie at Dayton was turned up to 3.9C oI revolutions per minute with no vibra ss tion. This result is due to perfet lp design of reciprocating parts and als re in large measure to precision an l. care in machining the crank sha su and the balancing of it before it 'h assembled into the engine.
 = Oiling System
 The oiling system deserves a wol m of description. The large capacit
 oil pan being made of aluminium coo J. readily so that the oil does not b,
 come thin. Tn addition to this fe; ,- ture a special chamber is machine n, in the top of the rigid barrel shape
 aluminium crankcase. This exten, B. the entire length of the case tn
 forming cooling chamber for u :" oil IS it passes from the pump to u al bearings.
 'n This engine is unusually efficie
 as to gasoline mileage and oil col