328 AIRCRAFT ENGINEERIN G December, 1937 Revised Requirements in Brinell Harness Testing—Direction of Rotation of Machine Tool Wheels and Levers D.S.S. No. 240 (Revised).—Brinell Hardness operating position, or, as seen from the outside selected for the ratio, for a test on any Testing of the machine, looking in the direction of the axis of the operated member. particular material. It is necessary that the The British Standards Institution has recently For screw-operated machine members, clock appropriate ratio should be stipulated in the issued a revision of B.S. No. 240, relating to wise rotation of the crank or handwheel in specification for the material, and for the Brinell Hardness Testing. In this revision general moves the machine member affected guidance of those responsible for the prepara a number of amendments has been made in towards the cutting position. tion of such specif cations the present Standard the requirements relating to the manner of I n rack and pinion mechanism, or the gives an indication as to the manner of carrying out the test, the principal among equivalent, where the crank or handwheel selecting an appropriate ratio. which are the following : moves in a plane parallel to the movement Copies may be obtained from the Publications Fo r the purposes of general testing, the produced, the general rule is that the part of Department, British Standards Institution, 28, thickness of the test specimen has been th e crank or handwheel which will normally Victoria Street, S.W.1, price 2s. 2d. post free. standardised at ten times the depth of the be gripped by the operator moves in the same impression in place of the former standard of direction as th e member of the machine affected. seven times. For the convenience of users B.S.S. No. 754, 1937 .—British Standard Th e specification includes in tabular form a schedule of minimum thicknesses of test System for the Direction of Rotation of Machine the description and movement of the movable- specimens calculated in accordance with this Tool Handwheels and Levers Relative to Move par t and the operating device for lathes and requirement, for a selected series of ball ment Produced drilling, planing, milling, slotting, shaping and diameters, loads and hardness numbers, is given grinding machines. This specification defines the direction of as an appendix. rotation of machine tool handwheels and levers Copies may be obtained from the British The present issue of this Standard docs not relative to the movement produced. The Standards Institution, 28, Victoria Street, attemp t to prescribe the precise value to be London, S.W.1, price 2s. 2d. post free. direction of rotation is to be judged from the
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Dec 1, 1937
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