Patent GB-568639-A (GB)
Title: A grinding, slitting and cutting-off machine
IPC: B24B27/06
Filed: 1943-08-24
Abstract: 568,639. Severing &c. ASQUITH, Ltd., W., and JOHNSON, A. Aug. 24, 1943, No. 13776. [Class 60] A grinding machine, described as for use as an abrasive cutting - off machine, comprises a vice for holding the work mounted so that it may be moved to feed the work to the grinding-wheel and also to determine the thickness of the piece to be cut off ; automatic gravityactuated feeding means are provided and micrometer setting and stop bar means also are employed. The machine comprises a base B in which is housed a coolant pump G, a tank G and an adjustable weight j for the feeding means; on the base is the mounting F<1> for the spindle of the grinding-wheel F, a wheel guard K, a carriage J, stop bar L and a micrometer setting gauge M. The wheel guard comprises two parts K, K<1> hinged at k, the lower part K<1> forming a coolant trough connected to the tank G<1>, which is mounted on wheels to allow of inspection, and may have compartments to assist in cooling &c. The upper part of the guard is held in position by a stirrup k<1> and carries a pipe k<2> supplying coolant to the wheel; a tray k<3> for cut-off work is formed on the guard. The carriage J runs on a bed J<1> fixed to the base, V-ways j<1>, j<2>, j<3> being provided for bearing balls j<5>, which are mounted in a cage j<6>; stops prevent the carriage from running off the bed. On the carriage is a plate j<8>, which receives the end of a cable j<11>' passing over a pulley j<12> and having thereon a carrier j<14> for the weight j, which is adjustable ; the carriage has thereon a swivelling bed N carrying a cross-slide N<1> movable by a screw with micrometer adjustment n<1>. The slide N<1> forms the body of a vice for holding the stock to be cut, and for that purpose has therein a channel n<2> of which the side n<3> forms the fixed vice jaw, the movable jaw O being pivoted at o to a holder o<1> on a slide o<2> movable by a worm o<4>, and the slide also carrying a screw o<5> to adjust the movable jaw to grip tapered stock. In a modified form of vice, the movable jaw also is adjustable about a horizontal axis transverse to the jaw. The stop bar, which controls the depth of cut made by the grinding-wheel, comprises a screw L mounted on the base and having slidably keyed thereon an externally screwed sleeve P, the position of which is fixed by nuts L<1>, l<6> on the screw L. The sleeve has an enlarged part at its rear end, upon which is rotatable, between a nut p<3> and collar p<2>, a collar Q having projecting therefrom on one side a ball Q<1> and on the other side a handle Q<2>, the weight of which tends to turn the collar: The, ball Q<1> engages a cam groove in a plate j<15> on the carriage, the groove having an upright portion q, a sloping portion q<1>, a steeply inclined portion q<2> and a horizontal portion q<3>. When the ball is in portion q, the carriage is held away from the wheel; when the ball is moved by the handle, the portion q<1> travels past the ball, until this engages the portion q<2> which holds the work just clear of the wheel. Movement of the handle then allows the work to engage the wheel without shock, the portion q<3>, during cutting, travelling past the ball. This movement is limited by a stop collar S on the sleeve, adjustable by a micrometer nut R, which is engaged by a stop S<1> on plate j<15> when the work is almost cut through, the final parting being done by rotating the nut L<1> to allow the carriage to move forward. For cutting off repetition pieces, the micrometer gauge M is used, the anvil of which is movable by crossslides m so as first to touch the wheel, the micrometer being set to zero, and then being adjusted by the micrometer to the required amount to be cut off. The gauge is then moved opposite the vice, and forms a stop against which the work is advanced, the gauge being moved out of the way during each cutting-off operation.