US Patent: 293,930
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| Machine for Threading Sectional Leading Screws
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Patentee:
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| Charles V. Woerd (exact or similar names) - Waltham, Middlesex County, MA |
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Patent Dates:
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| Applied: |
Aug. 25, 1882 |
| Granted: |
Feb. 19, 1884 |
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Patent Pictures:
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Joel Havens
"Vintage Machinery" entry for Ballou Mfg. Co.
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Description: |
| Charles V. Woerd was the Superintendent Engineer at the Waltham Watch Co.
"In the fall of 1882, Mr. Geo. F. Ballou, who is now superintendent of the Ballou Manufacturing Co. of Hartford, Conn., which has undertaken the manufacture of improved lathe and precision screws by what has been designated the Rogers-Ballou process, joined the writer in an attempt to give a practical application to the principles of construction which have been outlined in this paper. For about four years previous to this time, Mr. Ballou had been engaged in making a dividing engine which Mr. Chas. Van Woerd, at that time mechanical superintendent of the Waltham Watch Company, undertook to construct upon my order.
A high limit of precision was soon reached in the construction of a short screw, having a working length of about 4 inches, although the hope of obtaining from it an improvement in diffraction gratings was not realized. But in every attempt to make a screw haring a length of half a meter it was found impossible to go beyond a certain limit by the ordinary methods of construction and correction. After experimenting in various ways for nearly two years, Mr. Van Woerd decided to adopt the form of a sectional screw. Threads were cut upon ferrules 13 inches in length, each ferrule being cut from the same part of the leading screw. These ferrules were then placed upon a cylindrical shaft, and adjusted in such a way that the threads of the adjacent ferrules would match.
The method itself is not new; Whitworth tried it and abandoned it many years ago. Mr. Van Woerd, however, by the method described in patent No. 293,930, claimed that the difficulties encountered by Whitworth were entirely overcome. Mr. Ballou had done all of the actual work of construction to the point of the application of the new method of making the ferrules."
Transactions of the American Society of Mechanical Engineers, 1883-1884, pgs. 224-225
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