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Drill press technique question

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Forum topic by leftcoaster posted 05-14-2017 05:35 PM 397 views 0 times favorited 5 replies Add to Favorites Watch
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leftcoaster

189 posts in 711 days


05-14-2017 05:35 PM

Topic tags/keywords: drill press technique precision counterbore

I need to drill a 5/16” through hole with a 3/8” deep counterbore that is 3/4” in diameter.

What’s the best way to ensure that the 3/4” forstner bit is centered on the through hole after the bit change? Or should I drill the 3/4 first and then finish with the through hole?


5 replies so far

View HorizontalMike's profile

HorizontalMike

7655 posts in 2748 days


#1 posted 05-14-2017 05:42 PM

Using your 3/4in Forstner first will keep the 5/16in centered for the through hole.

-- HorizontalMike -- "Woodpeckers understand..."

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Rick_M

10610 posts in 2214 days


#2 posted 05-14-2017 05:57 PM

+1 Mike, larger size first

-- http://thewoodknack.blogspot.com/

View HorizontalMike's profile

HorizontalMike

7655 posts in 2748 days


#3 posted 05-14-2017 06:54 PM

And if you really wanted to be anal, go with 3/4in deep, 1/8in through, and then the 5/16in bit. This may help keep you from ripping out.

PLUS, don’t forget to use a “sacrifice” board underneath, as that also keeps the drill hole intact with NO tear-out.

-- HorizontalMike -- "Woodpeckers understand..."

View Madmark2's profile

Madmark2

371 posts in 423 days


#4 posted 05-14-2017 08:33 PM

Forstners will generally self-center as long as you start with the largest dia and work down.

M

View leftcoaster's profile

leftcoaster

189 posts in 711 days


#5 posted 05-14-2017 08:55 PM

Thanks everyone – really appreciate the help!

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