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T—07 / Fit test

Insert Fit Test

Charts can't tell you how an insert grips your MDF or plywood on your machine. Cut a strip of holes that step up in size, drive an insert into each, and keep the one that feels right. Then send that size to the Spoilboard Generator.

Holes

Units
Start from a common insert

    Steps of 0.2 mm (about 0.008″) are fine enough to feel a difference. Make the holes 1–2 mm deeper than the insert is long. Cut the test in the same material as your spoilboard.

    Labels

    The note is engraved at the left end so you remember which material and insert this strip was for.

    Bit & machine

    Use the same bit, feed and direction you'll use for the spoilboard. Helical holes come out a little different on every machine, and that's exactly what this test measures.

    –TOP VIEW
    Holes
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    Range
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    Blank needed
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    Est. run time
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    Run the test

      Found the one?

      Use it in the Spoilboard Generator →

      Too loose: the insert spins or pulls out. Too tight: the MDF bulges, splits, or the insert goes in crooked. Just right: it drives in with steady, firm pressure and stays put when you torque a bolt. If you'll glue inserts in with epoxy, go one step looser.

      Show the G-code