Gisholt Turret Lathe Guide for Care and Tooling

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...I in figure I34Z is shown the principle of the Adjustable Cutter. The cutter is made in halves with the inner ends beveled. The adjustment is made with a fine pitch screw which has a 90 point and works against the beveled ends of the cutter, expanding it. The Adjusting Screw (I89IA) is carefully made, hardened and accurately ground. A square hole is broached in the end to receive the Adjusting Wrench (I89I B) which is graduated, making possible adjustments in thousandths. An Adjustment Lock Screw (I89I C) is used to hold the Adjusting Screw in place when the proper setting has been made. The front of the cutter blade (see 55Z, page I3 ) is beveled to a 31/2 angle, same being widest at the inner end. A shim is used between the cutter and the cutter Key which we call Expanding Cutter Shim (I89I D). It is made of Chrome Nickel Steel, heat treated and is milled with a 4 bevel as shown. The bevel side of the shim is set against the cutter. As the cutter is milled to a 3yg angle and the shim to 4, when the Cutter Key is set up tight, the shim bears heaviest at the ends, locking the cutter so as to prevent shifting under heavy cuts. ' The Cutter Key (I89IE.) is made of regular drill rod, heat treated. It is flattened on one side at a 3 angle. The key hole in the bar is drilled at this same angle so that the key has a flat bearing against the Cutter Shim, or against Adjustment of the expansion cutters finer than.00I " is readily made by dividing the graduations on the Adjusting Wrench. The correct procedure for obtaining a predetermined diameter of the cutter, when setting it in the Bar, is as follows: First Be sure to remove any chips and thoroly clean the slot in the bar, the cutter, cutter shim, and adjusting screw. Second Place cutter...