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Forstner Bit WithOUT Pilot or Spur Center

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Forum topic by AaronSKuehn posted 1104 days ago 3865 views 0 times favorited 26 replies Add to Favorites Watch
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AaronSKuehn

238 posts in 1129 days


1104 days ago

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 1299 days


#1 posted 1104 days ago

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 1894 days


#2 posted 1104 days ago

i have to go with bertha

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

View WayneC's profile

WayneC

12256 posts in 2703 days


#3 posted 1104 days ago

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

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

View Sawkerf's profile

Sawkerf

1730 posts in 1674 days


#4 posted 1104 days ago

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 1245 days


#5 posted 1104 days ago

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

14624 posts in 2282 days


#6 posted 1103 days ago

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

12256 posts in 2703 days


#7 posted 1103 days ago

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

Loren

7284 posts in 2254 days


#8 posted 1103 days ago

The spur has a function; there for a reason.

-- http://lawoodworking.com

View HorizontalMike's profile

HorizontalMike

6915 posts in 1520 days


#9 posted 1103 days ago

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..."

View TheWoodNerd's profile

TheWoodNerd

288 posts in 1797 days


#10 posted 1103 days ago

View Bertha's profile

Bertha

12951 posts in 1299 days


#11 posted 1103 days ago

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

HorizontalMike

6915 posts in 1520 days


#12 posted 1103 days ago

The Nerd dun good! Cool!

Bookmarking the link as I type…

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

View tyskkvinna's profile

tyskkvinna

1308 posts in 1592 days


#13 posted 1103 days ago

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

14624 posts in 2282 days


#14 posted 1103 days ago

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 1245 days


#15 posted 1103 days ago

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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