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I was inspired to make a Center Finder as I did not want to drive 20 miles or pay extra bucks for a store-bought model.  

Upon doing a search, I found http://www.instructables.com/id/Make-a-Center-Finder/  posted by Phil B.

I just like to minimize my time working with metal, so I built a drawing, used MDF (can you imagine?) and cut the pieces out at TechShop in San Jose - www.techshop.ws.

Above, you see what the completed finder looks like...

Step 1: Pick up the 1/4" MDF...


... and cut it!  Here's the Corel Draw file...


... and here's the 1/4" MDF after cutting...
I use a 12" flat steel square, and a combination square set at 45 degrees, set the combination square directly in the corner of the steel square, You now have a center finder.
It did not show in the &quot;Related&quot; Instructables, but I did a low tech <a href="http://www.instructables.com/id/Make-a-Center-Finder/" rel="nofollow">center finder</a> a couple of years ago that does not require a computer, just basic geometry.
Ummmm.... Tortillas? <br> <br> <br> <br> <br>It was the only disc handy when I wrote the instructabus...
Ah, nice! I'm dying of curiosity, though: what do you use those wooden plates for? <br>
And I didn't have to drive to San Carlos in the rain...
I'm thanking you so much, AudreyObscura! Lots of fun to be had with the laser --- <br> <br>Ya know... I am much better off work with brilliant jigs than Irish Jigs... Easier on the spine...

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