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Here's a key to "reading" plywood.

Here's a key to "reading" plywood.

Seems like they could [produce 3/4"] with the same tolerances they use to produce the 23/32" stuff. Of course, they would be giving us more material and the cost, would probably go up proportionally.

Walt Schubert Hobart, Oklahoma

Back in the 1950s, '60s and '70s, you could get. 3/4" plywood that was indeed 3/4" thick. Nowadays, there is no longer any respect for the width and length, let alone squareness.

Like a lot of other businesses today, the MBAs rule the roost It costs too much to maintain the old standards. Turn out a cheaper product, and to hell with the customer. If the plywood producers of old could maintain the standards, with their technology, it would not be hard to do the same today!

D.G. Towers Ormond Beach, Florida

Fun with Formulas: Woodworking with Microsoft® Excel

There is more than one method to accomplish almost any woodworking task. When I began my cove cutting quest, my first thought was that all I would need was an easy way to calculate the fence angles which would accommodate my various cove requirements. After some head scratching and reviewing some — by now — very old math books, I came up with an equation.

I then turned to my trusty computer, equipped with a spreadsheet program, for help.

I entered the following formula into cell C2 of an Excel spreadsheet (see chart): =ASIN(B2/(2*SQRT(25-((5-A2)A2)))) * 180/3.14159

When you enter the depth of the cove into cell A2 and the width into B2, the correct fence angle magically appears in cell C2.

While this fence angle is just the beginning of the process, it is a very good start!

Lett Urban is a woodworker from Rancho Mirage, California.

I 15 2588892595 13 2626872108 109429659270 9 5940763306

23 251713383g 20 1283232898

16 5437639640 14 4775244146 31 7599611836 27 3117529933 22 3128407964 19 ^712370811 /

II 1138786223 I.

m 9974345170 |l

«3319660940 If

4 6243391515 ii

LZ150332765 H

If you receive a "#NUM!" error in the fence angle cell... you've entered data that does not allow for a fence angle that will cut a cove. Adjust one or both of your dimensions.

The Arc of the Cut

I happen to have a degree in mathematics, and I derived some calculations (below) using basic trigonometry, where you know the depth of cut and the blade width is 1/8", for cutting arcs.

Sam Bisignano Issaquah, Washington


Depth of cut

Arc angle/cut

Number of cuts

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