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The planetary etch tooling redesign discussed herein results in improved chemical etch processing and yield together with reduced maintenance down-time on the tool.
English (United States)
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Free Turning Eccentric Etch Insert
The planetary etch tooling redesign discussed herein results in improved
chemical etch processing and yield together with reduced maintenance down-
time on the tool.
An existing etch process employs the planetary gear driven eccen tric etch
wheel 1 shown in Fig. 1 for the purpose of providing a uniform chemical etch
spray over the work piece 2 during etch processing. The geared etch insert
holder(s) 3 have been determined, however, to limit the quality of the etch
obtainable due to non-randomness of the spray pattern acting on the work piece.
This lack of uniformity is related to debris build-up in the gear and results in
jamming and increased tool maintenance.
The disclosed redesign of the etch tool, as shown in Fig. 2, uses the
eccentric motion of free circular etch inserts to generate random motion, which is
due alone to their slippage. Additionally, the elimination of the gearing removes
a trap for debris build-up. The work piece 2 sits in an eccentric etch insert holder
1, which is free to rotate within the closed circle 3. As the etch wheel 4 rotates,
the free turning etch eccentric also rotates freely, as applied in the Fig. 3
The free turning eccentric etch concept provides much better etch uniformity
along with much less machine down-time for maintenance than formerly
experienced with the geared eccentric etch wheel.
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