Document ZwO70gbRkZ4mKB2o1xzrXoRV

Power Eiglaeeit' Notebook (CoM-w/romp,,, no) HOW TO DO MILLING WORK WITH A LATHE Cutting accurately spaced grooves with a milling machine having an in* dexing head U a fairly simple job. The same work can be done on a lathe, how* erer, when no milling machine is avail able. Here's how a lathe can be set up to cut axiat grooves on the surface of a brass cylinder. Having established the centers and tamed the outside diameter of the cyl* inder, bolt a change gear, with tho same number of teeth as the grooves needed. to the end of the cylinder by meens of holes drilled through the arms. Center the gear with respect to the cylinder axis and clamp in a manner that will not interfere with application of the tailitock center to the work. Assemble bracket to hold an indexing screw, as shown in the sketch below, and bolt to the lathe ways. The Index* ing screw should be a fine-thread 1)011, threaded into the plate and secured by s jam nut. Turn a conical point on the screw, concentric with the ,l fiat it off so the screw the teeth ond does not botitJvSa root of the gear. To cut the axial grooVt4| JIH lathe tool to the desired she tccu.e tu itw tool pou Vo, m Mgl Geer the lathe to give a coar* igsl tudinal feed and a slow spirit The grooves ore eut by traveriiaiSsI carriage toward the tailitock work held in position by 0ttn, e{;^| screw in the indexing bracket. Ra the lathe dog and lubricate the isai stock center with white lead duriogtSSJ cutting. Alter completing the eaSg3 of each groove. Index the work/,| tooth on the gear. 'ja In doing work of this kind, as atf cuts may be taken on each groon% necessary, but only a light cut etf&a mode without chattering. Of ceurie,-u9 index gear need not hove the ssaaaoq ber of teeth as the number of groJna desired in the work as long as the iSa are evenly divisible by the groom.-tiM indexing screw may be engagedjjfal every second, third, fourth, etc, teojCr M G Moore Suafnpjcon. Jfeujj Original Sstup m (107) Plug-Typo Cap Holds Shaft Sleeve In Place Edge Strips on Clip Board Aid Drawing A USED COMPRESSOR unit, when installed in our plant, was found to have the outboard end of the moiorshaft built up with a sleeve as shown in the top sketch st left. We assumed that the shaft had been damaged and rebuilt in this fashion to fit the bearing. As everything looked shipshape other wise, the unit was pieced in service and ran steadily six days a week during e period of about six months. Then one day while the unit was running the sleeve was found projecting through the cover plate. It had loosened from the shaft end neatly drilled a hole through the cover plate--as smooth a job os a drill press could do. To prevent a recurrence of this trou ble another sleeve, similar to the one that had loosened, was prepared but it was. chamfered at the outboard end. A plug was made to fit the chamfered end of the sleeve end a hole drilled ond lapped in the end of the moiorshaft. Theae elements were assembled and held together with a %-ln. bolt, as shown in the sketch. The unit has run 1ft years without further trouble of this or any other nature. John B Thuman Buffalo,' N. T. * The 1UH*n. clip board shown belcn has A'in. maple strips fastened to'iu left and bottom edges. These strip project Vfc In. above the board's turfac The clip allows quick removal or sertion of sketch sheets, which oti matically square up against ths pn jecting strips. Vertical and homattd] lines can be quickly end accurst*)* drawn with the aid of standard tritf; gles as shown. Edges of the board moj^ he squared up before attaching strips. This board has beeo found to b*u great utility In the field, away hw nmal drafting-room conveniences. even In the shop and office. T E Miller CM Tv*. POWS* Msy 1 w Take a good look at a Any boiler plant becomes a liability when improper water conditioning eats up profile by causing excessive blowdown, carryover . . . scale. But this liability can be turned into an asset with correct waive conditioning ... a matter of careful end scientific control. W. H. & L. D. BETZ is an organisation of engineers and chemists specialising in the solution of a)) industrial water problems. Years of experience have made Bets water conditioning service scientifically correct. .. complete . . . economical Our staff of engineers will welcome the opportunity of discussing your boiler water problems . .... W. H. & L. D. BETZ, Gillingham and Worth Sta., Philadelphia 24, Pa, In Canada: Beta laboratories Limited, Montreal 1. May 1948