Miniature center finder

[mklotz]

When I built my tensegrity model...

Miniature tensegrity table

I had to find the center of the sides of a number of 1/4" square pieces.

My homemade center finder...

Large scale center finder

is too big and clumsy for such small pieces so I decided to make a QAD (Quick And Dirty) tiny center finder...



The body is a coffee stirrer. I drilled a 1.5 mm hole in the center to accept the tip of a 0.5 mm mechanical drafting pencil. Using a compass centered in this hole, I laid out arcs on each side of the stirrer to establish the spacing of the pins. After that it was just a matter of lopping some pins from a small dowel and gluing them on the stirrer at points marked by the arcs. The spacing between the pins affects how close to the end of the stock the center finder can be used. If that is a concern, the spacing should be only slightly larger than the width of the stock.

In use...



the device is twisted on the stock until the pins touch the sides which puts the hole in the middle of the stock. A pencil marks the stock through the hole. Drawing the device along the stock makes a line if that is desired.

The take-away here is not so much the device but the method of construction. Not as accurate as my use of a DI to lay out the holes on my metal version but plenty accurate enough for woodworking.