Hints for Huge Holes
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Here are some points to remember when using these outsized tools.
- Use a drill press, and clamp the workpiece to the table.
- Run the tool at a slow speed, about 250 rpm or less, to minimize burning of the workpiece.
- When boring dense hardwoods, such as hard maple, opt for a Forstner or multispur bit rather than the holesaw or circle cutter.
- When boring deep with a Forstner bit or multispur bit or holesaw, clear the chips frequently by pulling the bit out.
- To prevent tearout when boring with an adjustable circle cutter, cut most of the way through; then finish the cut from the other side, inserting the tool's pilot bit into the guide hole.
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