RPM for big Forstner

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Forum topic by RodNGun posted 12-03-2012 03:51 AM 1013 views 0 times favorited 8 replies Add to Favorites Watch
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118 posts in 1723 days

12-03-2012 03:51 AM

What is the right RPM for a 3.5” Forstner bit?

8 replies so far

View oldnovice's profile


5651 posts in 2788 days

#1 posted 12-03-2012 07:13 AM

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Monte Pittman

21534 posts in 1758 days

#2 posted 12-03-2012 07:54 AM

Ssssslllllllllooooooowwwwwwww :-)

Interpreted as “Slow”

-- Mother Nature created it, I just assemble it.

View BobLang's profile


124 posts in 2820 days

#3 posted 12-03-2012 11:02 AM

About half the slowest speed on your drill press.

Unsolicited advice-clamp the wood down before boring.

-- Bob Lang,

View lumberjoe's profile


2893 posts in 1668 days

#4 posted 12-03-2012 01:58 PM

oldnovice, thanks for that PDF! I’m going to laminate it and hang it from the back of my drill press.


View tyskkvinna's profile


1310 posts in 2406 days

#5 posted 12-03-2012 02:13 PM

As slow as you can go and clamp that sucker down… and then find some music you really, really like because you’re going to be grooving to it for a while.

-- Lis - Michigan - -

View paratrooper34's profile


865 posts in 2372 days

#6 posted 12-03-2012 02:23 PM

Amen…..the slowest setting you have on your drill with a solid clamping system.

-- Mike

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1540 posts in 3181 days

#7 posted 12-03-2012 02:46 PM

250 rpm on a press with a lot of torque.

-- "Heaven is North of the Bridge"

View MonteCristo's profile


2098 posts in 1608 days

#8 posted 12-04-2012 08:07 PM

As others are saying, slow, but also watch how fast you feed the bit. A bit that size can pull your chuck right off its shaft – I have seen it happen.

-- Dwight - "Free legal advice available - contact Dewey, Cheetam & Howe""

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