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).
Method for balancing wheels using dummy bolts, lead washers, and Bakelite washers after a discussion with the Dunlop Company.
| Identifier | ExFiles\Box 28\4\ Scan328 | |
| Date | 22th August 1925 | |
| c. HS.{Lord Ernest Hives - Chair} R.{Sir Henry Royce} CJ. BJ. X457 BYB/H.{Arthur M. Hanbury - Head Complaints} 22.8.25. BALANCING OF WHEELS. With reference to the above question of and in reply to R1/M.{Mr Moon / Mr Moore} 19.8.25. Mr.Faull and Colonel Matthew of the Dunlop Company came over to Derby on this question yesterday. We had a very long discussion and at the finish it was decided that the best way to tackle the question of balancing of tyres was by the addition of three dummy bolts. The dummy bolts would carry lead washers of .1250" diameter, and 1/8" thick. In addition, a number of Bakelite washers would be made and the balance weights arranged as follows:- 1. Opposite the valve a dummy bolt approximately 1 1/2" long on the threaded portion would carry a standard balance weight for the tube and valve. Normally the part of the bolt which was occupied by the lead washer would then be filled up with Bakelite washers. Two shorter bolts would be supplied, equally spaced to the above bolt, which would be fitted with Bakelite or lead washers as required to balance the wheel. 2. When the whole wheel was in balance and the nuts screwed on to the balancing bolts, there would be a regular depth on all wheels for each bolt. The bolt opposite the valve would carry approximately 1 1/4" of 1" diameter lead and bakelite washers with a steel washer at the top. The shorter bolts would be made of such a length to carry the whole out of balance of an outer cover, approximately four ounces. and would be approximately, therefore, 1" overall. By the foregoing arrangement, it will be plain that each bolt would carry its full contingent of balancing washers and bakelite washers necessary to fill up the three bolts. The balancing of the wheel would depend upon where the lead washers were placed, so that the driver would never be without the means to balance his wheels as each wheel would carry a regular quantity of washers, bakelite and lead, to fill up the bolts, and at the same time keep the bolts always filled and of a regular depth, and at the same time to permit of the wheel being absolutely balanced. The Dunlop Company think that the foregoing proposal is the best solution of the difficulty. Con. | ||