- Email: [email protected]
Boring chuck for thin walled cylinder
CURRENT TOPICS. A u t o m o t i v e M a c h i n e T o o l s , O n c e D i s c a r d e d , Are R e b u i l t for Important W a r A s s i g n m e n t s . - - ( A utomotive War Production, Vol. I, No. 8.) By ordinary standards, t h e equipment was obsolete. It was a machine tool known as a vertical boring mill, once used t o make rims for automobile wheels. When the size and type of the wheel changed a few years ago, most firms got rid of their vertical boring mills of this type. But the value of machine tools is relative. Due to changed circumstances, the equipment which once was deemed suited for the scrap heap is now badly needed. There are only a few tools left in one automotive city to make the type of circular c u t made by vertical boring mills. And the demand is so great for such equipment in war work t h a t the various firms now exchange jobs in o r d e r to utilize the existing boring mills to their fullest capacity. There have been numerous cases where machines, designed specifically for some automobile manufacturing operation, have virtually been rebuilt in o r d e r t h a t they might be used in the automotive war job. A serious bottleneck in the production of Army 4 × 4 trucks was eliminated by adapting to war production several gear cutting machines which had been lying around "in the grease," unused since the a d v e n t of hypoid gears in late model cars. An ingenious gear cutting specialist of a n automotive company thought of the old machines that had been lying a r o u n d idle. Experimenting with ways to a d a p t them to the job, he designed a special cam arrangement which generated the machines in such a way as to c u t the four separate faces of a ball-race to specifications. Still another automotive company recently rescued a n old punch press from the s c r a p pile and, adapting it t o its gun job, effected an important short cut in production time. Formerly obdurator rings were inserted into the breach of the gun barrel by hand. Bv retooling the old punch press and through the use of a special fixture the rings whose insertion formerly required a b o u t t5 minutes each, are now squeezed into place in less than a minute each. R. H. O. B o r i n g C h u c k for Thin W a l l e d Cylinder.--( The Iron Age, Vol. 15o, No. 23.) One of t h e problems in boring a thin-walled metal cylinder is to prevent distortion in the machining operation. On a cylinder 6 in. o.d. and 6 in. long which is to be bored t o 5.000 =t= o.om in. after turning, for example, the pressure required to grip and drive 55~
552
CURRENT TOPICS.
IJ. 1;. 1.
the work in a conventional three-jaw chuck may distort the piece as much as 5 or 6 thousandths, resulting in scrapped work. At the L i m a , Ohio, plant of Westinghouse Electric & Mfg. Co., a special c h u c k has been developed for such work which eliminates out-ofr o u n d distortion on such cylinders. The workpiece is gripped by a spring steel band which is held by clamping lugs which act as a driving dog. The band floats circumferentially in a pot-type holder. This holder has three supports which fit the outside of the piece snugly and control the concentricity of the bore with the o.d. One support has a movable face that can be withdrawn slightly for loading. The supports are slotted on the faces to allow the spring band to pass through freely. The cylinder is placed in the chuck. The band is clamped tightly a r o u n d it and provides sufficient friction to drive the cut without distortion in the piece after the c l a m p and workpiece are rotated until the lugs stop against one of the supports which serves as a driver. The release screws on the mowtble face are then tightened with pressure sufficient to hold the cylinder radially but not enough to distort it. R. H. O. M o i s t u r e in the Menu.--Which of the common vegetables is most watery? Active research into dehydration of vegetables as a part of the war effort by the U. S. Department of Agriculture has developed information to guide commercial dryers in their work. In planning drying equipment, one fact the d r y e r must know, says the Agricultural Research Administration, is the quantity of water he will have to remove from the material while it is being processed. W.B. Van Arsdel of the Bureau of Agricultural Chemistry and Engineering has prepared a table giving the moisture content of nearly a score of vegetables as they are when ready for dehydration. This is substantially the same as the fresh vegetables prepared for home cooking. The relative rank in "wateriness" may upset some of the casual impressions of housewives. Sweetpotatoes are the driest of the common vegetables with from 2 to 3½ pounds of water for each pound of bone-dry material. Sweet corn ranks next with 3 to 4 pounds, followed b y peas and potatoes with from 31 to ~* pounds of water to a pound of dry matter. Kale has 6 to 7½ pounds; table beets 6 to 9, and beet greens 9 t o Io; with rutabagas 7 to Io and carrots 7½ to IO. Snap beans have 8 to Io pounds of water, onions 8 to II, spinach 8 to I3, chard 9 to I2, nltlstard greens 9 to 13. The vegetables with the most water to remove are cabbage with from 'Io to 15 pounds of water to each pound of dry matter and celery with r2 to 2o. R. H. ().
552
CURRENT TOPICS.
IJ. 1;. 1.
the work in a conventional three-jaw chuck may distort the piece as much as 5 or 6 thousandths, resulting in scrapped work. At the L i m a , Ohio, plant of Westinghouse Electric & Mfg. Co., a special c h u c k has been developed for such work which eliminates out-ofr o u n d distortion on such cylinders. The workpiece is gripped by a spring steel band which is held by clamping lugs which act as a driving dog. The band floats circumferentially in a pot-type holder. This holder has three supports which fit the outside of the piece snugly and control the concentricity of the bore with the o.d. One support has a movable face that can be withdrawn slightly for loading. The supports are slotted on the faces to allow the spring band to pass through freely. The cylinder is placed in the chuck. The band is clamped tightly a r o u n d it and provides sufficient friction to drive the cut without distortion in the piece after the c l a m p and workpiece are rotated until the lugs stop against one of the supports which serves as a driver. The release screws on the mowtble face are then tightened with pressure sufficient to hold the cylinder radially but not enough to distort it. R. H. O. M o i s t u r e in the Menu.--Which of the common vegetables is most watery? Active research into dehydration of vegetables as a part of the war effort by the U. S. Department of Agriculture has developed information to guide commercial dryers in their work. In planning drying equipment, one fact the d r y e r must know, says the Agricultural Research Administration, is the quantity of water he will have to remove from the material while it is being processed. W.B. Van Arsdel of the Bureau of Agricultural Chemistry and Engineering has prepared a table giving the moisture content of nearly a score of vegetables as they are when ready for dehydration. This is substantially the same as the fresh vegetables prepared for home cooking. The relative rank in "wateriness" may upset some of the casual impressions of housewives. Sweetpotatoes are the driest of the common vegetables with from 2 to 3½ pounds of water for each pound of bone-dry material. Sweet corn ranks next with 3 to 4 pounds, followed b y peas and potatoes with from 31 to ~* pounds of water to a pound of dry matter. Kale has 6 to 7½ pounds; table beets 6 to 9, and beet greens 9 t o Io; with rutabagas 7 to Io and carrots 7½ to IO. Snap beans have 8 to Io pounds of water, onions 8 to II, spinach 8 to I3, chard 9 to I2, nltlstard greens 9 to 13. The vegetables with the most water to remove are cabbage with from 'Io to 15 pounds of water to each pound of dry matter and celery with r2 to 2o. R. H. ().