Woodworkers Source Blog
Finishing Tips & Project Help from Your Friendly Lumber Supplier

What do these lumber fractions mean? 4/4, 5/4, 6/4, 8/4, 10/4, 12/4 In short, these fractions are the names for the thickness of hardwood lumber. The thickness is expressed¬†as a fraction, and goes in increments of quarters of an inch. However, this is a name only. It’s not a precise measurement.

Over the last few months, I’ve whittled up a healthy number of Baltic birch sheets to build a wide array of projects. A router table and fence, several drawer boxes, a craft table. In the same months, I’ve seen my colleagues use Baltic birch to make a table saw cross cut sled, a glue rack,
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