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Thread: TV Typewriter replica project back on track

  1. #311
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    Quote Originally Posted by falter View Post
    A new problem -- sometimes when I drill through pads, the pad on the opposite side lifts! I hope age hasn't weakened the copper's adhesion..
    Don't drill all the way though from both sides. Drill though the top layer of copper on one side, flip over and drill through on the other.

  2. #312
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    When you drill, back your work up with a sacrificial piece of PCB material--clamp tightly--use a sharp carbide drill and a high-speed drill press (>3000 RPM).

  3. #313
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    Thanks for the tip.

    Well, I managed to pull the two epoxied boards apart. I will attempt a redo once I have a better process. Now I just need to figure out how to remove the cured epoxy, which is advertised as solvent proof once cured.

  4. #314
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    Try scraping the epoxy off. If that fails, try sanding.

  5. #315
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    I'm thinking that too.. but worried about scratching the substrate.

  6. #316
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    Well, if you use a fine grit, it'll give the epoxy something to grab onto, so not a bad thing.

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