Layout Tool for Round Stock

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Project by Jim Jakosh posted 11-28-2013 01:31 AM 6342 views 18 times favorited 35 comments Add to Favorites Watch

When I want to find the center of a round piece, I can scribe a couple lines with that little yellow tool in the second photo and I have the center quickly. But I often want to lay out a pattern of holes on that round piece and need them equally spaced. For that , I always had to get out my little steel angles and hold them to the plastic tool and try to scribe a decent line for multiple locations. I just got tired of that and have been working on this little tool for a long time now and just completed it today.

This centering tool with the sliding attachment at at 90, 30 and 45 degrees makes it so simple and I don’t need 3 hands. I have looked for one of these in tool catalogs and cannot find another like it.

The V- is maple plywood and the centering arm is 3/16×1/2” 01 ground tool steel .
The aluminum attachments each have an 8-32 Vlier spring plunger in them to hold the gauge surface against the centering arm and they slide freely along it.

To use it, you draw a center line with the center arm. Then I put on the 90 degree angle attachment and draw a perpendicular line. Then you use the 30 or 45 degree attachment to line up with the line you just drew and scribe a new line on the centering arm.

Using this tool you can lay out 2,3,4,6,8 or 12 equally space segments. I find it is best to use a scriber rather than a a pencil because the lead wears and the line gets too thick and is off center then.
It is nice when you have a piece with a hole in the center too because all you need is a line to work to, not really a center point.

Now I can’t wait for the next round job that needs to be laid out to use this tool!!

Cheers, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

35 comments so far

View tyvekboy's profile


1309 posts in 2435 days

#1 posted 11-28-2013 01:44 AM

Very handy. Great tool design.

Wish I had the metal working tools you have.

-- Tyvekboy -- Marietta, GA ………….. one can never be too organized

View Strombergm's profile


10 posts in 1066 days

#2 posted 11-28-2013 01:51 AM

Jim- you send you projects are great! Theasternratorium two that you have posted have addressed two major problems that I routinely encounter….. Are you some sort of engineer?


-- Mike

View luv2learn's profile


2409 posts in 1725 days

#3 posted 11-28-2013 02:39 AM

That will be one of your most used jigs in the shop. Thanks for sharing it with us Jim.

-- Lee - Northern idaho~"If the women don't find you handsome, at least they ought to find you handy"~ Red Green

View BusterB's profile


1910 posts in 1430 days

#4 posted 11-28-2013 02:59 AM

Whew Jim, finally you posted a jig I dont see having an immediate need for….thank goodness!!! lol My “gotta make one of those” list is getting pretty full….lol Seriously cool jig buddy. I can see that being very handy around the shop.

-- Buster, Ocoee TN (Critics are men who watch a battle from a high place then come down and shoot the survivors - Hemingway)

View TopamaxSurvivor's profile


17577 posts in 3098 days

#5 posted 11-28-2013 03:04 AM

Looks handy.

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

View HillbillyShooter's profile


5811 posts in 1714 days

#6 posted 11-28-2013 03:07 AM

That is one cool tool—looks to me like Starrett may be in trouble. Really great job on this one!

-- John C. -- "Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth." George Washington

View Rick's profile


8287 posts in 2455 days

#7 posted 11-28-2013 03:18 AM

Very Nice Work Indeed! Thanks For Sharing!


-- Hope Everyone Is Doing Well! .... Best Regards: Rick

View Todd Barrone's profile

Todd Barrone

792 posts in 1694 days

#8 posted 11-28-2013 03:54 AM

Neat Idea, I wish I had the nack to build stuff like that.

-- "The Cedar King"

View CFrye's profile (online now)


8581 posts in 1262 days

#9 posted 11-28-2013 03:58 AM

Great stuff here Jim. I recently watched a video, somewhere, about marking a circle into sections like this using a compass. It was easy. So easy I forgot how to do it or where I found it. With this I could just walk over to the Wall O’Jigs and do it! (I think) Thanks for sharing.

-- God bless, Candy

View doubleDD's profile


5067 posts in 1465 days

#10 posted 11-28-2013 04:35 AM

This is a real good one. It will be extremely handy for some up coming projects. I will have to copy it one way or another. Thanks Jim.

Don’t loose this one.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View harry1's profile


520 posts in 1707 days

#11 posted 11-28-2013 06:18 AM

That’s one ingenious, useful and precision jig Jim, I’m envious of your talents.

-- Harry, Western Australia

View Dutchy's profile


1976 posts in 1591 days

#12 posted 11-28-2013 07:18 AM

How smart. Thank you for the idea.

-- My englisch is bad but how is your dutch?

View Doe's profile


1291 posts in 2252 days

#13 posted 11-28-2013 10:06 AM


-- Mother Nature talks, I try to listen

View aussiedave's profile


3114 posts in 1246 days

#14 posted 11-28-2013 11:34 AM

What a great tool for finding centre Jim…thank you very much for sharing this one….going to have to make one myself…

-- Dave.......If at first you don’t succeed redefine success....

View hunter71's profile


2696 posts in 2609 days

#15 posted 11-28-2013 11:53 AM

Well thought out build, thanks for sharing it.

-- A childs smile is payment enough.

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