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This section is from the book 'The Boy Mechanic Vol. 1', by Popular Mechanics Co. Also available from Amazon: 700 Things for Boys to Do.

When in need of small gears for experimental or model machines the amateur usually purchases , never thinking that he could make them on his own lathe. A small attachment can be made to fasten in the tool post of a lathe and the attachment made to take a mandrel on which to place the blank for cutting a gear. The frame is made from a 1/2 in. square iron bent as shown in the sketch with the projecting end filed to fit the tool post of the lathe. A pair of centers are fitted, one of which should have a screw thread and lock nut for adjustment in putting in and removing the mandrel.

A small attachment can be made to fasten in the tool post of a lathe and the attachment made to take a mandrel on which to place the blank for cutting a gear. The frame is made from a 1/2 in. Square iron bent as shown in the sketch with the projecting end filed to fit the tool post of the lathe. Providing you a cleaner cut on softwood and does pretty much everything related to woodturning. The carbide tips are pretty sharp and do the job well for all woodturners of any skill level. It features a rotatable cutter head that eliminates the need for sharpening the turning tools. The tool must have a specific geometry (known as tool geometry) for effective cutting and smooth surface finish. According to the tool geometry, the cutting tools can be classified into solid cutting tools and carbide tipped tools. Types of Cutting Tools: Various cutting operations require various types of cutting tools. This Video Will Show the Viewer How to Select the Proper Cutting Tool for Lathe Operations - Basic Tutorial - SMITHY GRANITE 3-in-1Helpful Quote from Video T. Tool & Cutter Sharpening for Home Machinists (Fox Chapel Publishing) Projects for a Grinding Rest & Accessories; Sharpen Drills, Lathe Tools, End Mills, Milling Cutters, and Hand & Woodworking Tools Hall, Harold, Bulliss, George on Amazon.com.FREE. shipping on qualifying offers.

Illustration: Gear-Cutting Attachment for Lathes

All the old clock wheels that can be found should be saved and used for index wheels. All of these wheels should be fitted to one end of the mandrel. The blank wheel is put on the outer end of the mandrel and a clock wheel having the number of teeth desired placed on the other end. When the mandrel is put in between the centers a small pawl is fastened with a screw to the frame with its upper end engaging in a tooth of the clock wheel. One clock wheel will index more than one number of teeth on a blank wheel. For instance: if the clock wheel has 18 teeth it can be made to index 6, 9 or 18 teeth to the blank by moving the number of teeth each time 3, 2 and 1 respectively.

In the sketch, A shows the end of the cutter and B the side and the shape of the cutting tool. When the cutter A, which is in a mandrel placed in the centers of the lathe, has finished a cut for a tooth, the pawl is disengaged and the mandrel turned to another tooth in the clock wheel.

In order to get the desired height it is sometimes necessary to block up the lathe head and the final depth of the tooth adjusted by the two screws in the projecting end of the frame which rests on the rocker in the tool post. Should too much spring occur when cutting iron gears the frame can be made rigid by blocking up the space between it and the lathe bed.

The cutter mandrel is placed in the centers of the lathe, or should the lathe head be raised, a short mandrel with the cutter near the end can be placed in a chuck, and adjusted to run true. The frame holding the mandrel, gear blank and clock wheel is inserted in the tool post of the lathe and adjusted for depth of the cutter. The lathe is started and the gear blank fed on the cutter slowly until the tooth is cut. The pawl is released and the mandrel turned to the proper number of teeth and the operation repeated. In this manner gears 3 in. in diameter can be made on a 6-in. swing lathe. --Contributed by Samuel C. Bunker, Brooklyn, N. Y.

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Lathe Cutting Tool Sharpening

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