Rolls-Royce Archives
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).
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Measurements of the parallelism and 'skew' errors of timing gear axes on a Bentley Unit (B-4).18th May 1935Box 136 \ 1  scan0154
Letter to The British Thompen-Houston Co. Ltd. regarding a failure of Fabroil Gears.30th May 1935Box 136 \ 1  scan0155
Follow-up letter from The Morse Chain Company regarding tests on their Timing Chain Drives.12th Aug 1935Box 136 \ 1  scan0156
Letter to The Morse Chain Co. Ltd. concerning a delay in testing their timing chain drive.13th Aug 1935Box 136 \ 1  scan0157
Requesting payment for an invoice from The British Thomson-Houston Company Ltd. for two Fabroil Gears.3rd Oct 1935Box 136 \ 1  scan0158
Official order for two Fabroil Gears from the British Thomson-Houston Co. Ltd.5th Oct 1935Box 136 \ 1  scan0159
List of tests and results to overcome drive to overrun transmission chunking.18th Oct 1935Box 136 \ 1  scan0160
Test results table comparing gearbox performance and settings on various cars.18th Oct 1935Box 136 \ 1  scan0161
Test report on clutch splines, axle backlash, and gearbox chunking issues on a 30-EX model.18th Oct 1935Box 136 \ 1  scan0162
Fitting of 45° timing gears to B-15, B-9, and B-19 units, and specifications for dynamo gears for 20/25 and Bentley models.14th Nov 1935Box 136 \ 1  scan0163
Letter from British Thomson-Houston Company Ltd regarding the failure of a Fabroil Timing Gear.23th Nov 1935Box 136 \ 1  scan0164
Letter to The British Thomson-Houston Co. Ltd. regarding a serious failure of Fabroil timing gears on a 12-cylinder engine.22th Nov 1935Box 136 \ 1  scan0165
Letter from The British Thomson-Houston Company Ltd discussing the material failure of a gear due to low fabric content.27th Nov 1935Box 136 \ 1  scan0166
Despatch of ten sets of Bentley Fabroil timing gears and a hold on further orders pending compatibility checks with the 'big bore' design.13th Dec 1935Box 136 \ 1  scan0167
Inability to fit Fabroil timing gears to the Bentley 'big bore' engine without revised designs.18th Dec 1935Box 136 \ 1  scan0168
Standardisation of parts report for Textolite/Fabroil timing gears.15th Nov 1935Box 136 \ 1  scan0169
Cost estimation and comparison for introducing a new part, including tooling costs for the 'G' series chassis.12th Aug 1935Box 136 \ 1  scan0170
The development of backlash in Fabroil timing gears for a Bentley.17th Dec 1935Box 136 \ 1  scan0171
Diagram of the Bentley 7 Unit wheel case gears, detailing backlash measurements and material specifications.7th Dec 1935Box 136 \ 1  scan0172
The successful testing of Bentley Fabroil Timing Gears and a note on the cost reduction.6th Jan 1936Box 136 \ 1  scan0173
Summary of an investigation into gear noise on Bentley & 20/25 engines, focusing on the wheelcase, crankcase, and engine gears.15th Jan 1936Box 136 \ 1  scan0174
Issues with gearcutting and lapping processes, with conclusions for camwheel and crankcase production.15th Jan 1936Box 136 \ 1  scan0175
Investigation summary regarding the wheelcase and gears for the Bentley and 20/25 models.31th Jan 1936Box 136 \ 1  scan0176
Conclusions on gear train noise, identifying the dynamo pinion as the source and discussing potential design solutions.31th Jan 1936Box 136 \ 1  scan0177
Responding to an investigation into failures of Bentley & 20/25-HP engine gears.3rd Feb 1936Box 136 \ 1  scan0178
Technical report on camwheel machining, gear tolerances, and an investigation into gear distortion on a Bentley engine.3rd Feb 1936Box 136 \ 1  scan0179
Machine maintenance, gear lapping, and checking the alignment of crankcase bores.3rd Feb 1936Box 136 \ 1  scan0180
The balancing cam fitted to the Bentley & 25 HP timing gears.27th Mar 1936Box 136 \ 1  scan0181
The balancing cam used on Bentley & 25 HP timing gears, noting production numbers and reliability.27th Mar 1936Box 136 \ 1  scan0182
Use of Textolite timing gears for Bentley and 20/25 engines.28th Mar 1936Box 136 \ 1  scan0183
Blueprint comparing balancing cams for Bentley I, Bentley II, 20/25, 25/29, and 'Big Bore' models.30th Mar 1936Box 136 \ 1  scan0184
Testing and potential adoption of Fabroil timing gears on 3½ Litre Bentley Chassis.28th Oct 1936Box 136 \ 1  scan0185
Proposal to redesign the Phantom III engine front end to simplify dismantling of the timing gears.29th Oct 1936Box 136 \ 1  scan0186
Trial fitting of Fabroil timing gears to 3 1/2 Litre Bentley chassis and the effectiveness of the cam balancing device.30th Oct 1936Box 136 \ 1  scan0187
The testing and wear of an Idler Gear Wheel E 87346 made of Fabroil 'A'.9th Nov 1936Box 136 \ 1  scan0188
Bentley Fabroil Timing Gears and a review of standardisation sheets.11th Nov 1936Box 136 \ 1  scan0189
Letter to British Thomson-Houston Co. regarding excessive wear on a Phantom III engine's Fabroil timing gear.14th Nov 1936Box 136 \ 1  scan0190
Letter from The British Thomson-Houston Company Ltd confirming a meeting with the Experimental Department.16th Nov 1936Box 136 \ 1  scan0191
Distortion issues with Idler Gears for 25/30 & Bentley engines, recommending a softer SZNX material as a solution.10th Dec 1936Box 136 \ 1  scan0192
Letter about a special fine mesh fabric 'Fabroil' gear blank being sent for testing due to excessive wear on a previous part.22th Dec 1936Box 136 \ 1  scan0193
Letter to The British Thomson-Houston Co. Ltd. requesting another fine mesh fabric gear blank for testing and a cost estimate for standardization.22th Dec 1936Box 136 \ 1  scan0194
Instruction to machine and fit a new Fabroil timing gear blank to Phantom III Unit No.14.22th Dec 1936Box 136 \ 1  scan0195
Extract from a letter from the Rover Co. concerning noisy timing gears.23th Dec 1936Box 136 \ 1  scan0196
Letter from The British Thomson-Houston Company Ltd confirming an order for a second special blank for Fabroil Gears.29th Dec 1936Box 136 \ 1  scan0197
The composition, properties, and manufacturing procedure for Clyde Alloy Steel used in gears.19th Jan 1937Box 136 \ 1  scan0198
Quotation from The British Thomson-Houston Company Ltd for Fabroil-A gear blanks.19th Jan 1937Box 136 \ 1  scan0199
Page two of a letter from The British Thomson-Houston Company, Limited requesting test results.19th Jan 1937Box 136 \ 1  scan0200
Suggestion regarding the material for timing gears on the New Wraith engine unit.3rd Feb 1937Box 136 \ 1  scan0201
Request to place an official order for two special Fabroil timing gear blanks for use on the Ph.III.29th Apr 1937Box 136 \ 1  scan0202
Letter to The British Thomson-Houston Co. Ltd. requesting two special Fabroil timing gear blanks for test cars.28th Apr 1937Box 136 \ 1  scan0203
Letter from British Thomson-Houston Co. Ltd regarding the dispatch of an order for Fabroil 'A' Timing Gear Blanks.29th Apr 1937Box 136 \ 1  scan0204
Letter from The British Thomson-Houston Company Ltd confirming an order for special Fabroil timing gear blanks.30th Apr 1937Box 136 \ 1  scan0205
Letter to The British Thomson-Houston Co., Ltd. clarifying a misunderstanding over order numbers.30th Apr 1937Box 136 \ 1  scan0206
Letter from The British Thomson-Houston Company correcting an error regarding an order and confirming the completion date for Fabroil Blanks.3rd May 1937Box 136 \ 1  scan0207
On the satisfactory performance and new hardness standardisation for engine timing gears after a 16,000-mile test.27th May 1937Box 136 \ 1  scan0208
The testing of Fabroil gears and the potential use of unhardened steel gears on the Phantom III and Wraith models.31th May 1937Box 136 \ 1  scan0209
Noisy timing gears on the Wraith engine, discussing potential causes and measurement issues.14th Jun 1937Box 136 \ 1  scan0210
Examination of Wraith III Unit No.1 timing gears to investigate the cause of a whine.14th Jun 1937Box 136 \ 1  scan0211
Development of equipment for measuring Wraith timing gears and a response to production criticism.17th Jun 1937Box 136 \ 1  scan0212
Request to send a section of a Phantom III idler timing gear to The Continental-Diamond Fibre Co. in the USA.19th Jun 1937Box 136 \ 1  scan0213
Letter regarding wear on a Phantom III timing gear and a request for Celeron material blanks for testing.19th Jun 1937Box 136 \ 1  scan0214
Cover note for a section of a Ph.III Fabroil Timing Gear sent to The Continental Diamond Fibre Co. for investigation.21th Jun 1937Box 136 \ 1  scan0215
Proposal for rig tests on Ph.III timing gears due to wear on the Fabroil idler gear, detailing the required rig modifications.21th Jun 1937Box 136 \ 1  scan0216
Requesting the detailing of three sets of new timing gears for the Wraith with an increased helix angle.22th Jun 1937Box 136 \ 1  scan0217
Letter to Bakelite Limited enquiring about moulded gear blanks made from laminated Phenolic material for use in Phantom III engine timing gears.24th Jun 1937Box 136 \ 1  scan0218
Inquiry to a supplier regarding moulded gear blanks made from laminated phenolic material for car engine timing gears.24th Jun 1937Box 136 \ 1  scan0219
Inquiry about manufacturing moulded gear blanks from laminated Phenolic material for the Phantom III engine.24th Jun 1937Box 136 \ 1  scan0220
Letter from Witton Moulded Insulation Works suggesting communication with Messrs Bakelite Limited regarding a specific material.25th Jun 1937Box 136 \ 1  scan0221
Letter from Bakelite Limited acknowledging receipt of a letter and advising that they will communicate further shortly.25th Jun 1937Box 136 \ 1  scan0222
Clarifying the material condition and manufacturing process for Wraith timing gears.29th Jun 1937Box 136 \ 1  scan0223
Letter from George Angus & Co. regarding the inability to supply moulded gear blanks and offering an alternative.30th Jun 1937Box 136 \ 1  scan0224
Letter from Bakelite Limited regarding sample materials for timing gears.5th Jul 1937Box 136 \ 1  scan0225
Requesting compression tests on specimens cut from Coleron and Fabroil timing gears.6th Jul 1937Box 136 \ 1  scan0226
The re-specification of an engine required for Phantom III timing gear tests.12th Jul 1937Box 136 \ 1  scan0227
The re-specification of an engine required for Phantom III timing gear tests.12th Jul 1937Box 136 \ 1  scan0228
Letter from George Angus & Co. regarding a proposed Durangus spiral wheel construction and enclosing a sketch.13th Jul 1937Box 136 \ 1  scan0229
Steering and timing gear specifications for the Wraith III chassis.15th Jul 1937Box 136 \ 1  scan0230
Letter to George Angus & Co. Ltd. regarding the testing of 'Durangus' material for Phantom III timing gears.10th Jul 1937Box 136 \ 1  scan0231
Letter from George Angus & Co. Ltd. confirming the preparation of Durangus Blanks for testing.19th Jul 1937Box 136 \ 1  scan0232
Standardisation of a Dynamo Pinion and Idler Gear due to difficulty in production.29th May 1937Box 136 \ 1  scan0233
Estimated cost for new tools relating to the S2 Series chassis.28th May 1937Box 136 \ 1  scan0234
Standardisation of a Dynamo Pinion & Idler Gear due to difficulty in production after hardening.28th May 1937Box 136 \ 1  scan0235
Estimated cost of new tools for a 25/30HP Chassis Standardisation Sheet X.26th Aug 1937Box 136 \ 1  scan0236
Examination report on the timing gears of Wraith Unit No. 5 after a period of running time.26th Aug 1937Box 136 \ 1  scan0237
Production issues, helix errors, and required tolerances for Wraith timing gears.30th Aug 1937Box 136 \ 1  scan0238
Request to build a trestle for a Wraith III engine for timing gear tests.1st Sep 1937Box 136 \ 1  scan0239
Letter from the Continental Diamond Fibre Company regarding gear blank wear, design problems, and manufacturing locations.17th Jul 1937Box 136 \ 1  scan0240
Letter from George Angus & Company concerning the supply of two Durangus Gear Blanks for a Phantom III engine.13th Sep 1937Box 136 \ 1  scan0241
Letter discussing the endurance test results for special fine mesh Fabroil timing gears and a query about a price increase.16th Oct 1937Box 136 \ 1  scan0242
Letter regarding the wear resistance of Fabroil timing gears and arranging a follow-up meeting.18th Oct 1937Box 136 \ 1  scan0243
Letter to The British Thomson-Houston Co. Ltd. requesting a sample of Fabroil Sheet for mechanical testing.25th Oct 1937Box 136 \ 1  scan0244
Letter to George Angus & Co. Ltd. requesting the price for 'Durangus' gear blanks pending trial results.25th Oct 1937Box 136 \ 1  scan0245
Letter to Bakelite Ltd. requesting a price for gear blanks following trials.25th Oct 1937Box 136 \ 1  scan0246
Letter from George Angus & Co. Ltd. seeking clarification on the price required for Durangus Gear Blanks based on drawing E.86982.26th Oct 1937Box 136 \ 1  scan0247
Quotation from Bakelite Limited for blanks of laminated sheet.26th Oct 1937Box 136 \ 1  scan0248
Quotation for the supply of Fabroil-A timing gear blanks.27th Oct 1937Box 136 \ 1  scan0249
Letter from The British Thomson-Houston Company regarding the despatch of material blanks and a sample of Grade 1047 Fabroil Compound.27th Oct 1937Box 136 \ 1  scan0250
Request to send two samples of Fabroil timing gear material to the Ford Motor Co. Ltd.8th Nov 1937Box 136 \ 1  scan0251
Letter to Ford requesting the testing of Fabroil gear material samples for the Phantom III engine.8th Nov 1937Box 136 \ 1  scan0252
Quotation letter from gear makers George Angus and Co. for rough sawn and moulded blanks.9th Nov 1937Box 136 \ 1  scan0253


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