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All Replies on Forstner Bit WithOUT Pilot or Spur Center

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View AaronSKuehn's profile

Forstner Bit WithOUT Pilot or Spur Center

by AaronSKuehn
posted 07-25-2011 04:03 AM


26 replies so far

View Bertha's profile

Bertha

12951 posts in 1381 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

4032 posts in 1977 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

12292 posts in 2786 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 1757 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 1328 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

14869 posts in 2364 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

View WayneC's profile

WayneC

12292 posts in 2786 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

7734 posts in 2336 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

6948 posts in 1602 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 1880 days


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

View Bertha's profile

Bertha

12951 posts in 1381 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

6948 posts in 1602 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 1674 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

14869 posts in 2364 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 1328 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

View ChesapeakeBob's profile

ChesapeakeBob

342 posts in 2171 days


#16 posted 07-25-2011 06:29 PM

Historically, all Forstner Bits were “rim-guided.” They had several advantages including flat-bottom holes, VERY accurate hole diameters, and are capable of drilling “partial” diameter holes since they are guided by the edge of the bit. In the last 20 years or so, machine spur “forstner” bits and other variations of bits got confused with the more traditional design. Techichally, only rim-guided” Forstner bits are truly Forstner Bits. Thank you Woodnerd for including the link to Jamestown Distributors that shows true Forstners.

-- Chesapeake Bob, Southern Maryland

View TopamaxSurvivor's profile

TopamaxSurvivor

14869 posts in 2364 days


#17 posted 07-25-2011 07:28 PM

Thx bentlyj ;-) Good article, how does that feed point retract?

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

View TopamaxSurvivor's profile

TopamaxSurvivor

14869 posts in 2364 days


#18 posted 07-25-2011 08:03 PM

What ever it is, it has to be strong!! Those feed screw pints take a lot of torque. years ago I need to drill a 2” hole through about 8” of framing for a conduit. The purchasing agent bought the cheapest forstner bit he could find without a feed screw. By the time I got that hole drilled, it was the most expensive 2” hole in the world!! Gotta love the stupid decisions people who have never done any real work do to save a buck ;-))

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

View ChesapeakeBob's profile

ChesapeakeBob

342 posts in 2171 days


#19 posted 07-26-2011 12:41 AM

Topamax… your’s is good example of a good tool used for the wrong job. The correct bit would have been a bit such as is sold for plumbers or electricians, many times made by Milwaukee. The Forstner bit without the feed screw was not proper bit for this job,as you quickly discovered.

-- Chesapeake Bob, Southern Maryland

View AaronSKuehn's profile

AaronSKuehn

250 posts in 1211 days


#20 posted 07-26-2011 04:16 AM

Thanks everyone for your input!

@TheWoodNerd: that’s EXACTLY what I was picturing in my head. Though about $60 cheaper :) I guess I’m going to take an existing bit and grind off the pilot. I thought of that, but didn’t really want to go that route.

-- Aaron

View marvinlee's profile

marvinlee

3 posts in 877 days


#21 posted 12-27-2012 02:50 AM

Forstner bits without a center point are available from Carbide Processors Inc. at carbideprocessors.com

The firm makes cutting diameters from 1/4’ to 3”

View AaronSKuehn's profile

AaronSKuehn

250 posts in 1211 days


#22 posted 12-27-2012 03:09 AM

@marvinlee: Thank you! This looks even better than other options I found because it’s carbide. Unfortunately they are out of stock on the 2.25” size I want…and sizes in that range. But I’ll keep checking. Thank you!

-- Aaron

View waho6o9's profile

waho6o9

5082 posts in 1265 days


#23 posted 12-27-2012 03:31 AM

View JNP's profile

JNP

106 posts in 1266 days


#24 posted 12-27-2012 05:03 AM

I have a few sizes that I drilled through 3/4” oak that I keep on hand and use as templates. Then grind the pilots off and clamp the template onto your work piece and use as a guide.

-- Jeff

View gfadvm's profile

gfadvm

11234 posts in 1378 days


#25 posted 12-28-2012 03:03 AM

I went a different way when I needed big holes part way through the stock with no center mark. I cut the size hole I needed in a piece of scrap with a holesaw, taped it to my workpiece, and used a pattern bit in my router. Made a very clean job of it!

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View hhhopks's profile

hhhopks

564 posts in 1066 days


#26 posted 12-28-2012 03:59 AM

Gadvm, that sound like a winner.

-- I'll be a woodworker when I grow up. HHHOPKS

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