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| Date: | Mon, 26 Aug 96 09:47:52 PST |
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Sounds like drill "wander". This can be caused by several
things.
Here are a few basic places to start checking:
1. Make sure panels lay flat on the drill table.
2. Make sure there is no movement in back-up, or tooling plates.
3. Make sure tooling pins fit snugly into tooling holes.
4. If the problem can be traced to one (or more) particular
spindle(s), it may be from excessive spindle runout.
5. Try changing entry material.
Mark Dowding
Multek, Irvine
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Subject: Drilling shifted
Author: [log in to unmask] at INTERNET_GATEWAY
Date: 8/26/96 7:55 AM
I am in the manufacturing of bare pcb boards. Lately I have been having shifting
problem in the drilling section. Sometimes its just a few holes that's
shifted. Sometimes its random shift. Observation shows the shifting happens
more on the smaller diameter holes, 0.65mm to 0.80mm. Glad to hear any
suggestion that can help me overcome this problem. Thanks
Bobby
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