Center Line Marker

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Forum topic by NedG posted 08-29-2014 10:49 PM 2483 views 1 time favorited 8 replies Add to Favorites Watch
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56 posts in 2485 days

08-29-2014 10:49 PM

Okay. I give up. I’ve made several attempts to make a simple jig to mark the center line of a piece of wood, such as you wold to mark the center of a mortise or tenon. I’ve researched all the usual places, but not found a good method for making this simple tool. Mounting a pencil in the exact need spot is the difficulty due to the shape of the pencil tip. The hole which the pencil goes through must be in the exact center of the jig. Finding the center is not so hard, but mounting the pencil properly is what’s hard. A pin to score the wood is doable, but it’s a pencil mark I’m looking for. Any suggestions will be appreciated. Ned

8 replies so far

View JoeinGa's profile


7739 posts in 2178 days

#1 posted 08-29-2014 10:58 PM

How ‘bout a simple thumbscrew in the side of the wood to secure the pencil.

-- Perform A Random Act Of Kindness Today ... Pay It Forward

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56 posts in 2485 days

#2 posted 08-29-2014 11:20 PM

Thanks for the thought. You’d think this would be an easy solution. I tried a set screw, but that either set a pencil already in place at the wrong angle, or it moved the pencil which was already set in the center line. Again, it seems that the point of the pencil, it’s shape, that makes it hard to get the pencil right in the center line. A mechanical pencil is no better from my experience. Thanks again. Ned

View Bill White's profile

Bill White

5100 posts in 4132 days

#3 posted 08-29-2014 11:39 PM

Set a scribe. Mark the scribe. Reverse the item and rescribe. Split the difference for the center.
Am I being too loose with my process?
Don’t get too hung up in the details.
It is wood, not steel.
Please understand that I’m not tryin’ to be a smarta$$.
My scribe is not registered in micro inches.


View KayBee's profile


1083 posts in 3417 days

#4 posted 08-30-2014 12:56 AM

Make one that the pin is the same size as the pencil. That way you can swap them out and they stay centered. Kind of like this.

-- Karen - a little bit of stupid goes a long way

View bondogaposis's profile (online now)


5046 posts in 2522 days

#5 posted 08-30-2014 12:56 AM

Here is one I made. It is not a pencil but it could be made with one. The key is to get the scribe or pencil centered between the posts. Very easy to do with dividers to mark the center points for the holes.

-- Bondo Gaposis

View Loren's profile


10477 posts in 3819 days

#6 posted 08-30-2014 01:02 AM

Find a tube you can make a bushing to stick the
pencil in.

I have this scribe with a spring loaded pencil and
bearings. The pencil is thicker than average. Of
course you can procure a pencil to fit your

View REO's profile


929 posts in 2245 days

#7 posted 08-30-2014 01:14 AM

bondogaposis has shown the easiest to use. no set up just use it if you want use a round pencil in a hole to fit you don’t have to fasten it in just hold the jig in one hand and with the tip of your finger over the top of a short pencil draw your line!

View Loren's profile


10477 posts in 3819 days

#8 posted 08-30-2014 01:17 AM

I confess I have never used or made a centerline marker.

I eyeball it and, setting a sliding square or marking gauge
make a mark from either edge. Then I split it by eye
with a pencil and reset my gauge to mark to that.

These are most useful.

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