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).
Footbrake glazing issues on the 40/50 chassis, proposing a new annealing treatment for brake drums.
| Identifier | ExFiles\Box 32\2\ Scan027 | |
| Date | 10th October 1921 | |
| H.R. 2952 (to T.) (S.H. 988. 22/2/21.) Bm. 5985:S. X3458 X224 [STAMPED: RECEIVED BY5-P10.10.21.] Mr Pendlebury from BY.{R.W. Bailey - Chief Engineer} c. Hs.{Lord Ernest Hives - Chair} 40/50 CHASSIS. REAR HUB AND BRAKE. RE THE TROUBLE WE ARE HAVING FROM FOOTBRAKES GLAZING AND LOSING THEIR CO-EFFICIENT OF FRICTION IN CONSEQUENCE. Would you kindly arrange to have a pair of drums which are fairly well advanced, fully annealed instead of giving them the usual heat treatment. The pair of drums in question should then be handed over to Hs{Lord Ernest Hives - Chair}, to be fitted to one of the experimental chassis in order to ascertain whether our standard .6 carbon steel drum in this condition will set up the glazing effect in exactly the same manner as occurs when the drum has a brinell figure between 201 and 229. It would appear that since the Goshawk 11, brake drums in mild steel tear up, that possibly our .6 carbon steel drums for the 40/50, fully annealed, which would lower the brinell to something below 201, would help us out of our present trouble. For EP{G. Eric Platford - Chief Quality Engineer}'s guidance we would like to add that if he has a pair of drums which are giving this trouble, we would like Mr Pendlebury to have them, in order to anneal same instead of giving the usual heat treatment. BY.{R.W. Bailey - Chief Engineer} | ||