Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5979/27A
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Individual
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Individual
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Publication date
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Publication of GB267497ApublicationCriticalpatent/GB267497A/en
B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
B28D5/02—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by rotary tools, e.g. drills
B28D5/021—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by rotary tools, e.g. drills by drilling
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Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
Drilling And Boring
(AREA)
Abstract
267,497. Bienenfeld, J. March 9, 1926, [Convention date]. Drilling.-In a drill guide. particularly applicable to machines for drilling pearls, the rear part 5 is carried so that it may be attached to a workholding turret without the use of a fixing member such as a screw, and the guide hole 7 is trimmed up after tempering to the exact size of the drill to avoid chattering.
GB5979/27A1926-03-091927-03-03Centreing guide for drills particularly applicable to machines for piercing pearls
ExpiredGB267497A
(en)