Marking tool ,Center Line

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Project by Robsshop posted 104 days ago 2494 views 44 times favorited 28 comments Add to Favorites Watch

My 2cd attempt at this little fun shopmade “center line marking gauge” started with a rare find down in the shop recently (Some SPARE TIME :) And along with some motivation from a fellow LJer who’s kind actions resulted in a prototype exchange of sorts, which in return prompted this 2cd generation marking tool adventure!
So to begin with and for those who might not know, this is a marking tool that allows You to locate the center of any boards edge without measuring nor calculating to do so. You simply reference the tools posts against the boards opposing faces and slide with light pressure, scribing a perfect Center line, that quick and that simple! I don’t have machining experience nor the equipment to simplify this build,just a basic woodworking DP. So I knew the hardest part of this build was going to be accuracy and achieving it ! Getting the reference posts and centering the scribe to within acceptable tolerances of each other took some effort. but by fabricating the set screw point by eye/hand , I assumed that most likely it would be off set fractionally and this in return would allow me to dial in accuracy by indexing the set screw until dead center was obtained (my theory anyways)! So I am happy to report that with some tweaking I got it to a point of acceptable accuracy and am very pleased with the overall outcome ! To Finish it up I fashioned some spare Bloodwood into a grip and attached with CA glue. All that was left to do was to apply a light coating of oil, sit back and marvel at its simplistic design and function!!

Not one of them tools that you will find yourself using everyday but when called upon, it sure makes the task easier and I am all for that!..........Thanks for taking the time to look and as always,any questions welcomed. Stay safe!


-- Rob,Gaithersburg,MD,One mans trash is another mans repurposed wood shop treasure ! ;-)

28 comments so far

View majuvla's profile


3223 posts in 1465 days

#1 posted 104 days ago

Verry inovative and pretty nice tool.

-- Ivan, Croatia, Wooddicted

View Jim Jakosh's profile

Jim Jakosh

11056 posts in 1703 days

#2 posted 104 days ago

Nice handy tool, Bob, You’ll use it a lot and probably make a larger one some day!!...Jim

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

View workerinwood's profile


2707 posts in 1665 days

#3 posted 104 days ago

Like it, great idea!!

-- Jack, Albuquerque

View Lanaug's profile


158 posts in 806 days

#4 posted 104 days ago

that is brilliant. This is definitely going on the list of must haves. Thank you very much for sharing.

View abie's profile


588 posts in 2368 days

#5 posted 104 days ago

I like all hand made shop tools,
who cares if you only use them once an a while
Great job
Keep posting these types of things

-- Bruce. a mind is like a book it is only useful when open.

View Jerry's profile


502 posts in 245 days

#6 posted 104 days ago

I have the prototype thanks to Rob’s generosity. I absolutely love it. First time I opened the package, I didn’t have the faintest idea of what I was looking at, but once he explained it to me, I was really impressed. Thanks Rob, I am using this already.

-- I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone.

View LJackson's profile


143 posts in 191 days

#7 posted 104 days ago

I’ve been wanting to build one of these since I’ve discovered them. Could you explain again how the set screw allows you to fine-tune the tool’s calibration? Getting the mark dead center to the posts has been my biggest query regarding its design.

View drbyte's profile


555 posts in 2659 days

#8 posted 104 days ago

Great center marker. I’ve made several for use on guitar necks and bows. They really are handy and your adjustable model is great!

-- Dennis, WV

View mafe's profile


9435 posts in 1686 days

#9 posted 104 days ago

Super cool.
You will be spot on now. ;-)
Best thoughts,

-- Mad F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

View bobasaurus's profile


1174 posts in 1781 days

#10 posted 104 days ago

This is a clever design. I’ll have to build one myself soon. Are those bars just threaded standoffs?

-- Allen, Colorado

View jroot's profile


216 posts in 2119 days

#11 posted 104 days ago

neat idea. Thanks for sharing.

-- jroot

View Sergio's profile


400 posts in 1290 days

#12 posted 104 days ago

its a good tool I have a couple of them

-- - Greetings from Brazil - --

View whitewulf's profile


438 posts in 1534 days

#13 posted 104 days ago

Rob, There is a much easier way to do this and perfect center. Drill center hole first,
place on pin (so piece can be rotated 180°), then drill one end, rotate to other end, drill and Bob’s your Uncle! Really do like your eccentric center pin though.

-- "ButI'mMuchBetterNow"

View Matt in Franklin's profile

Matt in Franklin

204 posts in 210 days

#14 posted 104 days ago

Did you mention where you got the metal parts of this tool? also, where did you get the plywood in your pictures? It looks so pretty!

-- I'm just a simple caveman

View Ocelot's profile


457 posts in 1235 days

#15 posted 103 days ago

Nice! ... and whitewulf’s suggestion is a great simplification.

showing 1 through 15 of 28 comments

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