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Floating Thread Tap

IP.com Disclosure Number: IPCOM000034209D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Lycke, HA: AUTHOR

Abstract

This article describes an arrangement for robotized threading of work pieces. A specially designed coupling is used in order to make this operation possible. Threading of bore holes in work pieces is practically exclusively performed manually today, at least for certain details. The difficulty in robotizing this operation arises because of the "incremental" movement pattern of the robots, which leads to non-uniform loading during the actual threading. Such a non-uniform loading might give rise to deficient tolerances in the manufactured thread. By utilizing a special connection or coupling 1 between the robot arm and the thread tap 2, the robot arm can be held in a fixed position and the threading can be performed under constant load.

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Floating Thread Tap

This article describes an arrangement for robotized threading of work pieces. A specially designed coupling is used in order to make this operation possible. Threading of bore holes in work pieces is practically exclusively performed manually today, at least for certain details. The difficulty in robotizing this operation arises because of the "incremental" movement pattern of the robots, which leads to non-uniform loading during the actual threading. Such a non- uniform loading might give rise to deficient tolerances in the manufactured thread. By utilizing a special connection or coupling 1 between the robot arm and the thread tap 2, the robot arm can be held in a fixed position and the threading can be performed under constant load. As shown in the figure, the intercoupling device 1 comprises a shaft 3 provided with splines 4, transferring rotational motion from an air motor to the thread tap 2. The shaft is slidably arranged inside an outgoing shaft 5. Further there is an upper 6 and a lower 7 spring provided in the coupling, whereby the upper spring has a relatively high spring constant and the lower spring has a very low spring constant. The robot brings the work piece 10 to a fixture (not shown) where it is held in very precise position. Then the robot fetches the threading equipment according to the invention and places the thread tap 2 in the bore hole opening 11. Thereafter, the robot exerts a slight pressure on the thread tap and its associated coupling, whereby the upper spring 6 is loaded and compressed about one millimeter. The a...