LumberJocks

Forstner Bit WithOUT Pilot or Spur Center

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by AaronSKuehn posted 07-25-2011 04:03 AM 5765 views 0 times favorited 34 replies Add to Favorites Watch
View AaronSKuehn's profile

AaronSKuehn

279 posts in 1426 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


34 replies so far

View Bertha's profile

Bertha

12951 posts in 1596 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

4035 posts in 2191 days


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

i have to go with bertha

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

View WayneC's profile

WayneC

12499 posts in 3000 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

View Sawkerf's profile

Sawkerf

1730 posts in 1971 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 1542 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

15675 posts in 2578 days


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

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

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

View WayneC's profile

WayneC

12499 posts in 3000 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

Loren

7967 posts in 2550 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

HorizontalMike

6975 posts in 1816 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..."

View TheWoodNerd's profile

TheWoodNerd

288 posts in 2094 days


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

View Bertha's profile

Bertha

12951 posts in 1596 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

HorizontalMike

6975 posts in 1816 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

1310 posts in 1888 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

15675 posts in 2578 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.

-- Bob in WW ~ "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 1542 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 34 replies

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com