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SESK: Stuff Everyone Should Know · sesk.info/weld-drill-speed-bigger-slower

As the drill bit gets larger, what should happen to drill press spindle speed?

Speed should be reduced.

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  1. It should be increased
  2. It should be reduced ✔
  3. It stays the same

Why: A big bit's edge travels faster at the same RPM, which overheats and dulls it. Larger holes need slower RPM.

Huh, didn't know that: Pilot holes should be used on holes larger than 3/8 inch, and holes are enlarged in no more than 1/4 inch steps.

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Not all construction work is equally enjoyable. For instance, drilling a large hole is boring, but fastening two pieces of metal together is riveting.
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References

Answer: It should be reduced. A big bit's edge travels faster at the same RPM, which overheats and dulls it. Larger holes need slower RPM.

  1. Open Oregon Pressbooks, Chapter 3: Drill Press openoregon.pressbooks.pub/manufacturingprocesses45/chapter/chapter-3-drill-press
    The spindle speed should be reduced as drill size is increased.
    Checked 2026-10-10.

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