The Circular Insert

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Before doing any routing on the frame, it's best to cut the circular insert first. The insert shown here starts out as a 14" square made by laminating a piece of white Formica to a piece of W plywood. However, before laminating, drill a V«" hole in the center of the plywood. (This will be the pivot hole for the trammel-point attachment.) Then bond the Formica and plywood with contact cement.

To cut out the circular insert, tack the four corners of the laminated square to a plywood backing board. Then I used a Sears router and trammel-point attachment to rout a 4'¿"-radius circle, Fig. 1,

There is one problem here. The stem of the trammel attachment is too long to fit in the shallow pivot hole in the plywood. This may cause the trammel attachment to bend as you're routing — thus creating a slightly beveled edge on the circular insert. This edge can be sanded square, or left as is; either way will work.

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Wood Working for Amateur Craftsman

Wood Working for Amateur Craftsman

THIS book is one of the series of Handbooks on industrial subjects being published by the Popular Mechanics Company. Like Popular Mechanics Magazine, and like the other books in this series, it is written so you can understand it. The purpose of Popular Mechanics Handbooks is to supply a growing demand for high-class, up-to-date and accurate text-books, suitable for home study as well as for class use, on all mechanical subjects. The textand illustrations, in each instance, have been prepared expressly for this series by well known experts, and revised by the editor of Popular Mechanics.

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