Traditional Toolmaking by Franklin D. Jones

Author:Franklin D. Jones [Jones, Franklin D.]
Language: eng
Format: epub
Publisher: Skyhorse Publishing, Inc.
Published: 2012-01-31T05:00:00+00:00

As an example, we will suppose that it is desired to make a chaser that is to be used in making taps inch in diameter having 26 threads per inch. First find 26 in the “threads per inch” column; then by following along the line to the last column, the angle at which the milling machine table is to be set, or the angle A,, is obtained. This angle equals o degree and 42 minutes. On the lower edge of the table are the diameters on which the chasers are to be used, and as the diameter in this case is inch, we follow up that column to the 26 threads per inch line, where we obtain the angle at which the angle iron is to be located on the table of the machine, or angle B, which is 1 degree and 24 minutes. The machine being properly set, it is a small matter to shape the thread by moving the table to and fro, gradually feeding it upward until a perfect thread is obtained on the chaser. It is advisable to keep the hob well lubricated when cutting to insure a smooth thread on the chaser. A very good lubricant for this purpose is a mixture of one-half turpentine with one-half good lard oil. This will also be found an excellent lubricant for general thread cutting in the lathe.

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