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Shrink image, it was a bit big.
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Criggie
Criggie
  • 145
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I've had good luck using "speedbor" flat spade bits. They are boring normal flat bits but there's a cutting tang on the outer edge of both flats, and they work to cut the circumference loose before the main cutting edge lifts the swarf out.

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Not a brand recommendation, there are plenty of examples at your average bigbox store.

I've had good luck using "speedbor" flat spade bits. They are boring normal flat bits but there's a cutting tang on the outer edge of both flats, and they work to cut the circumference loose before the main cutting edge lifts the swarf out.

enter image description here

Not a brand recommendation, there are plenty of examples at your average bigbox store.

I've had good luck using "speedbor" flat spade bits. They are boring normal flat bits but there's a cutting tang on the outer edge of both flats, and they work to cut the circumference loose before the main cutting edge lifts the swarf out.

enter image description here

Not a brand recommendation, there are plenty of examples at your average bigbox store.

Source Link
Criggie
Criggie
  • 145
  • 5

I've had good luck using "speedbor" flat spade bits. They are boring normal flat bits but there's a cutting tang on the outer edge of both flats, and they work to cut the circumference loose before the main cutting edge lifts the swarf out.

enter image description here

Not a brand recommendation, there are plenty of examples at your average bigbox store.