US Patent: 92,565
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| Screw Threading Machine
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Patentee:
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| Benjamin F. Bee (exact or similar names) - Harwich, MA |
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Patent Dates:
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| Granted: |
Jul. 13, 1869 |
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Jeff Joslin
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Description: |
| S. J. Renwick - patent attorney"Many milling-tools have profiles, which vary materially from arcs of circles, and from straight lines. Previous to my invention it had been customary to cut the teeth of such tools in a series of separate cuts or approximations to the true lines, which approximations were afterwards finished up by hand. In operating upon this principle, the same cut is made upon every tooth of the cutter-blank; then the machine is reset, or the tool is changed, or both, these operations are performed, and a second approximation is cut upon every tooth of the cutter-blank. Each of these approximations, requires, the cutter blank to be turned once upon its axis, and as in many cases the profile of the milling-cutter differs so much from a true circular arc, or from a straight line, that the several approximations do not produce the required form of tooth, a great deal of hand-work is frequently required in finishing up the cutter after the teeth have been roughed out by a machine. The object of my invention is to enable each tooth to be completely cut. at one operation, to the true form, by means of a rotating cutter, so that each tooth may be completely cut at one operation, and that the entire blank may be out by turning it but once upon its axis, instead of as many times as the number of separate approximations..." |
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