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Forstner Bit WithOUT Pilot or Spur Center

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Forum topic by AaronSKuehn posted 07-25-2011 04:03 AM 4167 views 0 times favorited 26 replies Add to Favorites Watch
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AaronSKuehn

246 posts in 1188 days


07-25-2011 04:03 AM

Topic tags/keywords: forstner circle hole question drill press

Does anyone know if someone makes a Forstner bit that does NOT have a pilot or spur center?

I’d like to drill a clean, flat-bottom hole without that divot in the center where the pilot point was.

~Aaron

-- Aaron


26 replies so far

View Bertha's profile

Bertha

12951 posts in 1358 days


#1 posted 07-25-2011 04:29 AM

You could chuck a router bit maybe. You could buy a cheap Forstner and grind the point off.

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

View bigike's profile

bigike

4031 posts in 1954 days


#2 posted 07-25-2011 04:37 AM

i have to go with bertha

-- Ike, Big Daddies Woodshop, http://www.icombadaniels@yahoo.com

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WayneC

12290 posts in 2762 days


#3 posted 07-25-2011 04:39 AM

What size hole? I was thinking plunge router as well.

-- We must guard our enthusiasm as we would our life - James Krenov

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Sawkerf

1730 posts in 1734 days


#4 posted 07-25-2011 06:08 AM

I don’t think that I would want to use a Forsner bit (or spade bit, hole saw, etc) without a center spur. That’s what keeps the thing from trying to skate all over the place when it’s turning.

Just for giggles, try using a hole saw without the drill bit.

-- Adversity doesn't build character...................it reveals it.

View David Grimes's profile

David Grimes

2072 posts in 1305 days


#5 posted 07-25-2011 06:15 AM

I’m pretty sure there aren’t any forstners made without the center spur.

Start the hole with the “normal” Forstner, then grind the point off to finish it.

-- If you're going to stir the pot, think BIG spoon or SMALL boat paddle. David Grimes, Georgia

View TopamaxSurvivor's profile

TopamaxSurvivor

14793 posts in 2341 days


#6 posted 07-25-2011 08:01 AM

That is what I would do; get it started, then take the point off.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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WayneC

12290 posts in 2762 days


#7 posted 07-25-2011 08:05 AM

Set up two bits? I guessing there is more than one hole to drill.

-- We must guard our enthusiasm as we would our life - James Krenov

View Loren's profile (online now)

Loren

7620 posts in 2313 days


#8 posted 07-25-2011 08:53 AM

The spur has a function; there for a reason.

-- http://lawoodworking.com

View HorizontalMike's profile (online now)

HorizontalMike

6942 posts in 1579 days


#9 posted 07-25-2011 02:26 PM

Use two bits the same size, one WITH the spur, one WITHOUT. Start your hole with the spur-bit to get the outer portion of the bit below the surface and then switch to the de-spurred bit to finish. You did not say how deep your intended hole is so this may or may not work for you.

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

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TheWoodNerd

288 posts in 1857 days


#10 posted 07-25-2011 02:57 PM

View Bertha's profile

Bertha

12951 posts in 1358 days


#11 posted 07-25-2011 02:59 PM

Thanks Woodnerd, I’d never heard of those!

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

View HorizontalMike's profile (online now)

HorizontalMike

6942 posts in 1579 days


#12 posted 07-25-2011 03:19 PM

The Nerd dun good! Cool!

Bookmarking the link as I type…

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

View tyskkvinna's profile

tyskkvinna

1308 posts in 1651 days


#13 posted 07-25-2011 03:39 PM

I’ve a small set of forstner bits that I simply grinded the bit off. You don’t have to pre-drill it—just use a drill press and make sure your work item is clamped or otherwise secured down and it’ll be fine. Go slow for the first couple of rotations to make a groove, then crank it up fast and hold on tight.

those flat-on-purpose bits look really cool!

-- Lis - Michigan - http://www.missmooseart.com - https://www.etsy.com/people/lisbokt

View TopamaxSurvivor's profile

TopamaxSurvivor

14793 posts in 2341 days


#14 posted 07-25-2011 06:08 PM

That looks just like mine so I wondered what the big deal was?? Googling Forstner bits http://www.google.com/search?rlz=1T4ADRA_enUS423US423&q=Forstner+Bits&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&hl=en&tab=wi&biw=1024&bih=515
was a bit of a surprise. I didn’t know they come in such a wide variety.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View David Grimes's profile

David Grimes

2072 posts in 1305 days


#15 posted 07-25-2011 06:14 PM

I bet the rim-guided are not best sellers at $45 a pop.

How about start ALL the holes, then grind the spur to finish (and still need only one) ?

OP says “a… hole…” so maybe he only needs to do one, anyway.

-- If you're going to stir the pot, think BIG spoon or SMALL boat paddle. David Grimes, Georgia

showing 1 through 15 of 26 replies

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