Layout Tool for Round Stock

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Project by Jim Jakosh posted 272 days ago 5298 views 16 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


537 posts in 1644 days

#1 posted 272 days ago

Very handy. Great tool design.

Wish I had the metal working tools you have.

-- Tyvekboy -- Marietta, GA

View Strombergm's profile


10 posts in 275 days

#2 posted 272 days ago

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 (online now)


1679 posts in 934 days

#3 posted 272 days ago

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


1374 posts in 640 days

#4 posted 272 days ago

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


14724 posts in 2307 days

#5 posted 272 days ago

Looks handy.

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

View HillbillyShooter's profile


4506 posts in 924 days

#6 posted 272 days ago

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


6454 posts in 1664 days

#7 posted 272 days ago

Very Nice Work Indeed! Thanks For Sharing!


-- COMMON SENSE Is Like Deodorant. The People Who need It Most, Never Use It.

View Todd Barrone's profile

Todd Barrone

467 posts in 903 days

#8 posted 272 days ago

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

-- "Courage is being scared to death but saddling up anyway" John Wayne

View CFrye's profile


2838 posts in 471 days

#9 posted 272 days ago

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


2397 posts in 674 days

#10 posted 272 days ago

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


512 posts in 916 days

#11 posted 272 days ago

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

-- Harry, Western Australia

View Dutchy's profile


464 posts in 800 days

#12 posted 272 days ago

How smart. Thank you for the idea.

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

View Doe's profile


952 posts in 1461 days

#13 posted 272 days ago


-- Mother Nature talks, I try to listen

View aussiedave's profile


3014 posts in 456 days

#14 posted 272 days ago

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

-- Dave.......Keep calm and make more sawdust....

View hunter71's profile


1989 posts in 1818 days

#15 posted 272 days ago

Well thought out build, thanks for sharing it.

-- A childs smile is payment enough.

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