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).
Specification table for cutter dimensions and tolerances at various pitch diameters.
| Identifier | ExFiles\Box 2\3\ B002_X 116 117 119 120-page02 | |
| Date | 21th December 1944 | |
| [...D.C.D CENTRES] RUNNING WITH / 10.000 CENTRES 10.1799 .4917 .1545 2A° 19'44".6 [...]ON OF THE CUTTER MANUFACTURERS. [...]TH-CUT CIRCULAR THICKNESS AT 4.0909 PITCH DIAMETER .24108-.24308. [...]TH-CUT CIRCULAR THICKNESS AT 3.0909 PITCH DIAMETER .29201-.29401 [...]TH-CUT CIRCULAR THICKNESS AT 10.1799 PITCH DIAMETER .17684-.17884 ROLLS-ROYCE LTD. PRINT ROOM 21 DEC 1944 DERBY DES. 17437. | ||