Simple divider for centering cuts on edges of common boards.

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Project by Bob #2 posted 10-14-2007 01:20 AM 7475 views 35 times favorited 23 comments Add to Favorites Watch
Simple divider for centering cuts on edges of common boards.
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Finding center can be frustrating when you are in the shop and need a quick way to place a biscuit or dowel or mortise.
This simple math trick does the job for you.

Drill two holes in a piece of 3/8” thick stock that are 2” a part and exactly the size of your selected dowel material
The center hole should be the diameter of your favorite pencil stock.
All the holes must line up along a straight pencil line for this to work.
Drill a hole dead center between the previous dowels for the pencil.
If it’s a bit loose set a screw through the side of your wood to hold it .

That’s it!

By placing a dowel on each side of your wood and running down the stock with the dowels touching the sides you will draw a line dead center on the work.
You may want to stack more layers up to hold the pencil so the sharp end doesn’t protrude as much.

Enjoy Bob

-- A mind, like a home, is furnished by its owner

23 comments so far

View Thos. Angle's profile

Thos. Angle

4444 posts in 4525 days

#1 posted 10-14-2007 01:28 AM

Yep, got one but it isn’t as nice as yours. Mine uses nails. Ugly but it gives me a resaw line. Good post .

-- Thos. Angle, Jordan Valley, Oregon

View mot's profile


4926 posts in 4599 days

#2 posted 10-14-2007 01:48 AM

I hope you made two!

-- You can discover more about a person in an hour of play than in a year of conversation. (Plato)

View David's profile


1969 posts in 4702 days

#3 posted 10-14-2007 01:56 AM

Very nice! I need one of these to make fast layouts with my Leigh FMT jig . . . better than using two combination squares. Thanks!


View Karson's profile


35209 posts in 4963 days

#4 posted 10-14-2007 02:04 AM

Great Bob.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Appomattox Virginia [email protected]

View SC_Galoot's profile


30 posts in 4445 days

#5 posted 10-14-2007 03:05 AM

I’ve always liked this idea. And thanks to some time spent in the shop today, I’ve got some cutoffs that will be perfect for this. I don’t have any dowels long enough so I’ll try Thos’ idea of using nails.Thanks for sharing.

View gene's profile


2184 posts in 4447 days

#6 posted 10-14-2007 03:13 AM

I don’t have one now, But I will on Monday. Thanks for the idea.

-- Gene, a Christian in Virginia

View WayneC's profile


14358 posts in 4660 days

#7 posted 10-14-2007 03:56 AM

Great Tip Bob. Thanks for sharing.

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

View Chris 's profile


1880 posts in 4554 days

#8 posted 10-14-2007 04:55 AM

Thanks for the walk through. I think I’ll be making one tomorrow :)

-- "Everything that is great and inspiring is created by the individual who labors in freedom" -- Albert Einstein

View lclashley's profile


244 posts in 4677 days

#9 posted 10-14-2007 05:02 AM

Cool idea, Thanks Bob.

View shaun's profile


360 posts in 4468 days

#10 posted 10-14-2007 12:44 PM

Why do I do everything the hard way? This is slick and definitely one of those deals where I couldn’t see the forrest cause all those trees were in the way. Thanks, Bob

-- I've cut that board three times and it's still too short!

View Bob #2's profile

Bob #2

3810 posts in 4584 days

#11 posted 10-14-2007 02:08 PM

p.s. guys, for those who don’t know you can buy various sizes of dowel material in 3 or 5 foot lengths at most hardware stores worth their salt.
I keep a tube in the shop with the more common sizes.
They are not all that expensive.
I the high end harwood suppliers often have doweling in various hardwood materials as well.


-- A mind, like a home, is furnished by its owner

View Dadoo's profile


1789 posts in 4553 days

#12 posted 10-14-2007 02:11 PM

I agree with Shaun…I’ve seen this idea/jig before but still find myself measuring and marking.

*Still not ready to snatch the pebble…sigh.

-- Bob Vila would be so proud of you!

View Bob #2's profile

Bob #2

3810 posts in 4584 days

#13 posted 10-14-2007 02:26 PM

Of all the things I really do poorly, measuring is foremost.

So, I have to use all the props I cant find. <g>


-- A mind, like a home, is furnished by its owner

View coloradoclimber's profile


548 posts in 4631 days

#14 posted 10-14-2007 05:16 PM

Nicely done Bob. Simple and eminently useful.

This looks like just the ticket for splitting a board for resawing. Typically I’ll make up some laminate out of 4/4 stock, then resaw it down the middle. To find the middle I usually eyeball the fence position, nick it on the bandsaw blade, flip the stock over, nick that side and see if the second nick lines up with the first nick, then usually adjust and repeat. A little trick like this ought to get me right on the first time.

View TomFran's profile


2961 posts in 4557 days

#15 posted 10-15-2007 09:38 PM

Great tool, Bob! Thanks for taking the time to give us some pictures and a little “how-to” instruction. I really appreciate posts like this.

-- Tom, Surfside Beach, SC - Romans 8:28

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