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Electrical Machining of a Screw Thread

IP.com Disclosure Number: IPCOM000091231D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Mansbridge, DS: AUTHOR [+4]

Abstract

Screw thread 1 is formed in steel rod 2 by pumping an electrolyte, for example, hydrochloric acid solution, through hypodermic needle 3 mounted in block 4 of insulating material which is caused to move along rod 2 in direction A. Rod 2 is connected as an anode and needle 3 as a cathode. The electrolyte escapes through passage 5 in block 4. Rod 2 is secured to and rotates with feed screw 6. Block 4 is tied to nut 7 and constrained against rotation by guide rail 8. The pitch of thread 1 is determined by that of feed screw 6 and the groove form of thread 1 by the end configuration of needle 3 and the flow characteristic of the electrolyte.

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Electrical Machining of a Screw Thread

Screw thread 1 is formed in steel rod 2 by pumping an electrolyte, for example, hydrochloric acid solution, through hypodermic needle 3 mounted in block 4 of insulating material which is caused to move along rod 2 in direction A. Rod 2 is connected as an anode and needle 3 as a cathode. The electrolyte escapes through passage 5 in block 4. Rod 2 is secured to and rotates with feed screw 6. Block 4 is tied to nut 7 and constrained against rotation by guide rail 8. The pitch of thread 1 is determined by that of feed screw 6 and the groove form of thread 1 by the end configuration of needle 3 and the flow characteristic of the electrolyte.

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