. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . led, and arethen held together by a large iron ringwhich can be decreased in size, thusforcing the bars together under pres-sure. It is then necessary to place thewhole in a hot oven so as to allow themica to soften and form to the irregu-larities of the copper, and thus preventmovement of bars after commutator isfinished. After removing from the hotoven two V-shaped slots (W), are cutone on either end at definite angles, toprovide a means of clamping and hold-ing the bars (B) in place after
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . led, and arethen held together by a large iron ringwhich can be decreased in size, thusforcing the bars together under pres-sure. It is then necessary to place thewhole in a hot oven so as to allow themica to soften and form to the irregu-larities of the copper, and thus preventmovement of bars after commutator isfinished. After removing from the hotoven two V-shaped slots (W), are cutone on either end at definite angles, toprovide a means of clamping and hold-ing the bars (B) in place after the ironring is removed. The method of clamping these barsis as follows: Two V rings (L and N)are inserted in the V-shaped slots (W),previously cut in the bars, and are heldtogether by the bolts (O). To pre-vent the rings short-circuiting the com-mutator bars (B), moulded mica Vrings (P and Q) are placed in the slotsbefore the bolts are tightened, and amica bushing (S) is slipped into posi-tion also. After the bolts are firmlyset up the iron ring can be commutator is now ready with the. FIG. 9.—CROSS SECTION OF COMMU-TATOR. exception of two things to press on thespider at diameter C (see Figs. 6 and 7).It is necessary to protect the mica Vring (P) where it projects beyond thecommutator bar and a string or tapebanding (X) is used pointed with shel-lac or other equally good insulatingvarnish. Slots (Y) must also be cutin each commutator bar, into which thewires from the coils are soldered. Railway Operations in proceedings at the annual meet-ing of the Central Uruguay Railway Montevideo (Ltd.), and Northern andEastern Extension Railways show a largeincrease in the gross earning of the com-bined system over previous years, thetotal amount for the year ending June30, 1911, being $4,951,192. The reportshows also a considerable increase in thetonnage handled as compared with pre-vious years, the total being 964,026 tons;and also in the carriage of live
Size: 2162px × 1156px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
