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Drill bit size to drill holes for router bit shanks.

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Forum topic by dbhost posted 10-12-2010 09:16 PM 3117 views 0 times favorited 15 replies Add to Favorites Watch
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dbhost

5604 posts in 2691 days


10-12-2010 09:16 PM

I know this might seem like a dumb question, but it would seem obvious that if a person were to build a router bit holder, they would want the holes for the shank to be slightly oversized from the shank. But just HOW oversized should they be?

-- My workshop blog can be found at http://daves-workshop.blogspot.com


15 replies so far

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AaronK

1440 posts in 2924 days


#1 posted 10-12-2010 09:25 PM

1/4” plus a little wiggle :-)

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AaronK

1440 posts in 2924 days


#2 posted 10-12-2010 09:25 PM

or 1/2” + wiggle (of course)

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PurpLev

8523 posts in 3108 days


#3 posted 10-12-2010 09:32 PM

+1/16 diameter should be good (equals 1/32 oversized all around)

-- ㊍ When in doubt - There is no doubt - Go the safer route.

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dbhost

5604 posts in 2691 days


#4 posted 10-12-2010 09:39 PM

1/16” was what I was figuring… Given the bits I have, that puts me into using Forstner bits. I guess that is okay too… Gives a nice flat bottom except for where the point went…

-- My workshop blog can be found at http://daves-workshop.blogspot.com

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chrisstef

15656 posts in 2466 days


#5 posted 10-12-2010 09:45 PM

Hey dbhost,

Ive got a nice plan that i got when i bought a Freud table and router package for a router bit storage cabinet if you’re interested. Its got 3 rows of bit storage and a slide out drawer. I think i should be able to scan a copy and send it PDF. If you’re interested send me a message.

Chris

-- rock, chalk, jayhawk

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NBeener

4808 posts in 2633 days


#6 posted 10-12-2010 11:23 PM

I made a stand for my chisels, to stand them up by their handle ends.

My first thought was do the math (using PurpLev’s figure).

But … it was very simple for me to just drill four or five holes of varying diameter, and then figure out which fit I liked the best.

Just another option….

-- -- Neil

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dbhost

5604 posts in 2691 days


#7 posted 10-13-2010 12:26 AM

My bit rack isn’t planned anything super fancy at this point. Just a cutoff of some 2×4 that is screwed to a piece of 3/4” ply cutoff. I just wanted to redo the bit board part of it with some nicer holes. I hadn’t given Forstner bits any real thought.

I don’t have a lot of loose bits, but I do have a few, and they need a home of their own. The drill press is awfully close to this as well. I am starting to figure on things like my countersinks, and other various bits that have no home should live there as well…

I DO have extra space here for some planned but not yet in my collection bits. We will see how well that works out.

-- My workshop blog can be found at http://daves-workshop.blogspot.com

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syenefarmer

431 posts in 2540 days


#8 posted 10-13-2010 01:32 AM

The first router bit holder that I built I also just drilled holes into a piece of lumber. What I ended up with was a bunch of router bits with rust on the shanks. The moisture from the wood caused the bits to rust. If you have the space you might want to consider using these router bit holders. I haven’t had any problems with rust since I started using them.

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Scott Bryan

27251 posts in 3281 days


#9 posted 10-13-2010 01:38 AM

I made a rack for my router bits recently and used a 1/2” forstner bit and drilled the holes about 1/4” deep in a scrap piece of 3/4” plywood. All of the bits fit just fine.

-- Challenges are what make life interesting; overcoming them is what makes life meaningful- Joshua Marine

View Jim Bertelson's profile

Jim Bertelson

3962 posts in 2624 days


#10 posted 10-13-2010 04:49 PM

This may not be pertinent, but if you end up trying to use Forstner bits of larger size, especially, (this might be true for smaller bits), and you cannot use your drill press for whatever reason:

Drill down 1/4 to 3/8 or so with the forstner bit, then use a spade bit to complete the hole. I did this on some 1” thick MDF, and boy did that make the job easier. The forstner gives you the nice clean entry, and the spade just travels down the the smooth walls at a depth where the walls of the hole aren’t so visiible. I was using some good Irwin spade bits that had prongs on the periphery.

Jim

-- Jim, Anchorage Alaska

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dbhost

5604 posts in 2691 days


#11 posted 10-13-2010 05:15 PM

Not worried about rust issues caused by the holders. The stock has been in my shop for 8+ years, so it is plenty dry, and I am planning on putting a clear urethane finish on the piece, including the holes. Specifically to address wood to metal contact issues…

-- My workshop blog can be found at http://daves-workshop.blogspot.com

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Ripthorn

1406 posts in 2444 days


#12 posted 10-13-2010 05:30 PM

I just built a quick and dirty router bit holder the other day (very quick and VERY dirty). I made a little sealed box with 4” wide pine and 1/4” plywood, split it open on the table saw, put on hinges. For the bit storage, I have a lot of leftover pegboard that I used. I drilled out several holes for 1/2” shanks and left the rest for 1/4” shanks. I put some cleats on the bottom of the box for the pegboard to be screwed to so that the shanks could go in a half inch or so deep. Works great, looks like something waiting to be burned.

-- Brian T. - Exact science is not an exact science

View Jim Bertelson's profile

Jim Bertelson

3962 posts in 2624 days


#13 posted 10-13-2010 11:33 PM

Re rusting bits, finish the wood with some BLO or Watco and you shouldn’t have a problem.

-- Jim, Anchorage Alaska

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araldite

188 posts in 2863 days


#14 posted 10-14-2010 12:23 AM

Your question sent me to checking out the one I made many years ago out of an old piece of 1”X4” pine. I drilled the holes with 1/4” and 1/2” Fostner bits, yet the router bits fit perfectly. There’s no wobble but yet they lift right out (the holes are 1/2” deep). I measured the inside of the holes with my digital calipers, which is good down to 1/64”, and they measured 1/4 and 1/2. So I figure there must be some slight runout in my 20 year old Craftsman drill press. It’s never caused me a problem, but it’s good to know. I guess you can look at it as a quick and dirty test for the slop in a drill press. Anyway, based on my experience, I think 1/64” wider is enough if you happen to have drill bits that size.

-- Failure is the road to success if you learn to learn from your mistakes - Vince, Greenville, SC

View Jim Bertelson's profile

Jim Bertelson

3962 posts in 2624 days


#15 posted 10-14-2010 04:03 AM

In our climate, I wouldn’t even think about rusting issues, in spite of our proximity to salt water. I have a lot of unfinished bit holders of various sorts, and nothing has rusted. My favorite is an oil based finish because things slide better and there is no change in the dimension of the jig or fixture. But I have a lot of totally unfinished stuff around holding tools…...................

Jim

-- Jim, Anchorage Alaska

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