Patent GB-190005079-A (GB)
Title: Improvements in the Relationship Between the Tracer Ends and the Cutting Tools of Engraving Machines, and in Grinders for Grinding such Tools.
Inventor: LOCK WILLIAM HENRY
Filed: 1900-03-17
Granted: 1901-04-17
Abstract: 5079. Lock, W. H., and Barr, M. March 17. Producing curved surfaces.-Relates to apparatus for grinding tracer ends and corresponding tools for engraving- machines as surfaces of revolution. A tube D, with an abrader E and a projecting abrading - end E<1>, is mounted in bearings B, C on a base A, and fitted with a driving- pulley D'. A diamond dresser F for the end E<1> is mounted on a traverser G which works in a fixed block G<1> and is actuated by a nut L and a screw K carrying a worm-wheel M engaging a worm on a shaft O. The shaft 0 is connected by worm gearing P, Q to a shaft I, which turns in bearings J and is driven through a leather friction-wheel H from the end of the tube D, which is faced with leather. The direction of traverse is varied by shifting the wheel H from one side of the axis of the tube D to the other by sliding the shaft I, the worm Q being mounted on a feathered sleeve Q<1> to allow the sliding without disconnecting the gearing. The abrader E is adjusted by a set-screw e for wear. The traverser G is limited by a set-screw g<4> and a slot g<5>. The dresser F slides in a guide in the traverser, and is set by a screw g provided with a milled head g<1> and a collar g<2> fitting in a groove in the dresser. A slide S moves between guides s, s<1>, and is limited by a stop block T sliding in guides s, s<2>. A bracket U on the block is fitted with a conical plug V, which is forced down into a hole in the slide S by a screw v, a collar on the screw engaging a groove in the plug. The blank W for the tracer end is carried in the usual quill X and clamp X'. A disc X<2> on the outer end of the quill has four peripheral notches X<3> for engagement with a spring detent X<4>. The clamp X<1> is fitted on a slide w working in a table x pivoted to the slide S by a hollow pivot x<1> turning in a bearing x<6> in the slide. The distance between the axis of the pivot and the surface E<1> is one of two elements of adjustment. To make this adjustment, a pin x<2> having an upper part x<3> of known diameter is inserted on the pivot x<1>, the block T and slide S are plugged together, and the slide is moved towards the surface E<1> until the part x<3> bears against it. The block T is then fixed by a clamp t. A micrometer screw T<1> in a sleeve T<2> behind the block is set to the reading equal to the radius of the part x<3>, and is pushed through the sleeve up to the block and clamped. The block T is then unclamped and disconnected from the slide S, and the pin x<2> is removed. The micrometer reading will give the distance between the pivot and the surface E<1>. The other element of adjustment is the distance between the axis of the blank W and the axis of the pivot. This is made by a micrometer w<1>, which is carried by the table x and bears against the slide w. The motion of the table x about its pivot is limited by an adjustable stop with a scale z<1>. Data are calculated from the two adjustments and marked on the tracer ends to be proportioned for grinding the cutting-edges of the corresponding tools for various ratios between the pattern and object.