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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 1096 days ago


26 replies so far

View Bertha's profile

Bertha

12951 posts in 1291 days


#1 posted 1096 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 1887 days


#2 posted 1096 days ago

i have to go with bertha

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

View WayneC's profile

WayneC

12252 posts in 2696 days


#3 posted 1096 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 1667 days


#4 posted 1096 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 1238 days


#5 posted 1096 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

14589 posts in 2274 days


#6 posted 1096 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

View WayneC's profile

WayneC

12252 posts in 2696 days


#7 posted 1096 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

7232 posts in 2246 days


#8 posted 1096 days ago

The spur has a function; there for a reason.

-- http://lawoodworking.com

View HorizontalMike's profile (online now)

HorizontalMike

6914 posts in 1512 days


#9 posted 1096 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 1790 days


#10 posted 1096 days ago

View Bertha's profile

Bertha

12951 posts in 1291 days


#11 posted 1096 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 (online now)

HorizontalMike

6914 posts in 1512 days


#12 posted 1096 days ago

The Nerd dun good! Cool!

Bookmarking the link as I type…

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

View tyskkvinna's profile

tyskkvinna

1308 posts in 1584 days


#13 posted 1096 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

14589 posts in 2274 days


#14 posted 1096 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 1238 days


#15 posted 1096 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

View ChesapeakeBob's profile

ChesapeakeBob

341 posts in 2081 days


#16 posted 1096 days ago

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

14589 posts in 2274 days


#17 posted 1096 days ago

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

14589 posts in 2274 days


#18 posted 1096 days ago

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

341 posts in 2081 days


#19 posted 1095 days ago

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

238 posts in 1121 days


#20 posted 1095 days ago

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 787 days


#21 posted 575 days ago

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

238 posts in 1121 days


#22 posted 575 days ago

@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

4747 posts in 1175 days


#23 posted 575 days ago

View JNP's profile

JNP

105 posts in 1176 days


#24 posted 575 days ago

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

10557 posts in 1288 days


#25 posted 574 days ago

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

560 posts in 976 days


#26 posted 574 days ago

Gadvm, that sound like a winner.

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

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