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).
Complaint and investigation into rear brake shoe issues on a Phantom III.
| Identifier | ExFiles\Box 92\4\ scan0319 | |
| Date | 1st April 1937 | |
| To Mr.Scott. from RBC/Cy. C. to Mr.Carter. C. to Mr.Creswell. C. to Mr.Goodall. C. to Fs{F. Steele}/Ct. C. to MX.{John H Maddocks - Chief Proving Officer} C. to MU. PHANTOM III. REAR BRAKES. We had a complaint from Mx.{John H Maddocks - Chief Proving Officer} 5 weeks ago that the clearance between the rear foot and hand brake shoes was reduced so much after test as to cause fouling, and this was taken up at the time with the Fitting shop (Mr.Roscow.) On further investigation we find that the bores for the fulcrum pins are not square with the C/L of the shoes. The test tackle requires replacement and is now in hand. The machining of the steel brake shoes is not above reproach and owing to the heavy reduction of metal, distortion is difficult to remove. This in turn affects the milling location for the bearing brackets which are then fitted out of square with the C/L. Stretching is then necessary to correct this error. The cast alum shoes are not square off their fulcrum bores, and depending on direction, will either lean into each other or lean apart. The Ferodo linings are not exactly parallel with the shoes and a slight overhang occurs. To overcome this complaint, we must ensure the maximum drawing clearance is obtained before passing to Test Department. All Alum brake shoes must be checked for squareness of bore with C/L. and stretched where necessary. The steel shoes must be checked after fitting the bearing bracket and also stretched where necessary. The location in first operation on steel shoes should be altered from plain solid pads to swivelling pads to reduce the buckling at present set up, and the second operation fixture altered to reduce the spring. Will Fs{F. Steele}/Ct. attend to this, and will NO. please check all built up details. The machining of the cast shoes should be looked into and improved along the lines indicated. RBC/Cy. | ||