From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The results of bursting tests for moulded commutators, comparing mouldensite and Elo moulding powders.
Identifier | WestWitteringFiles\I\July1922\ Scan88 | |
Date | 13th July 1922 | |
To R.{Sir Henry Royce} & E.{Mr Elliott - Chief Engineer} from EPC. c. to CJ. & FR. c. to Hy.{Tom Haldenby - Plant Engineer} & EP.{G. Eric Platford - Chief Quality Engineer} c. Fg. & Ds. c. to Wor.{Arthur Wormald - General Works Manager} c. to Wor{Arthur Wormald - General Works Manager}/Mr. Brock. ORIGINAL X.4333 - BURSTING TESTS OF MOULDED COMMUTATORS Further to our EPC1/T3.7.22 we now report below the results of further tests of a similar nature, but the experience gained in the tests as previously reported has enabled commutators to be built up which have been much more difficult to cause to fail. The actual results, tabulated in a similar way to that previously adopted, are given on the accompanying sheet. A study of these results now indicates that commutators made from the mouldensite powder would be most satisfactory. Mouldings from mouldensite, of the grade supplied to us for this purpose, possess greater strength, but this is necessarily at the sacrifice of some degree of flowing quality. This renders mouldensite, of the particular grade used, somewhat more difficult to mould. The makers can supply a freer flowing mouldensite composition, but only at the sacrifice of the strength which is so much required for this purpose. It is also to be supposed that Messrs. Fleming can supply their Elo in a rather stronger quality, more suited to this purpose. The difficulty that we have experienced with the Elo powder is the one of inconsistency in the results from one consignment to another. The results we have experienced with the mouldensite powder certainly appear to be more consistent. Contd. | ||