Before jumping into the mortise and tenon joints I thought it a good idea to make sure my chisels have a proper edge. For this project I need a 3/8 mortise chisel, a 1/2” firmer chisel for the half blind dovetails, and a 1-1/2” bevel edge chisel for the tapered legs.
A proper edge is actually quite simple. You need but two intersecting planes. Generally, the smaller the angle between the two planes, the sharper the edge and easier the cut. The smaller the angle, though, the less force it can take without folding over or blunting. Consequently, the harder the material you are going to cut, the greater the angle of the two intersecting planes needs to be. An edge for cutting both hardwoods and softwoods should be around 25-30 degrees. In my opinion some woodworkers obsess needlessly over angles and such. Close is good enough. The most important thing about getting a really sharp edge is that the intersecting planes must be as flat as possible and highly polished. If your edge isn’t polished like chrome, it isn’t sharp.
My sharpening station consists of diamond impregnated stones (course, medium, and fine), 1000 grit wet/dry sandpaper on glass, and a leather strop charged with chromium oxide. I use a honing guide to insure a constant angle while I work my way from left to right across the station, starting with the course diamond plate and ending up with the leather strop.
Sharpening by hand takes time and patience. Every time I being this process two motion pictures come to mind. First, The Shawshank Redemption starring Tim Robbins and Morgan Freeman. Freeman’s character Ellis Boyd “Red” Redding, the narrator of the film befriends Tim Robbins’ character, Andy Dufresne, a banker who is sentenced to life in Shawshank State Penitentiary for the murder of his wife and her lover, despite his claims of innocence. At one point in the film “Red” equates the arduous prison life to that of geology, ”… pressure
and time. That’s all it takes, really. Pressure and time.” .
It’s not until the end of the process that the second motion picture comes to mind … Radio, based on the true story of T. L. Hanna High School football coach Harold Jones, played by Ed Harris, and a mentally challenged young man, James Robert “Radio” Kennedy, played by Cuba Gooding Jr. Haunted by a childhood memory, Coach Jones befriends Radio, who eventually learns to read and receives a high school diploma. The scene that comes to mind is when Coach Jones and Radio are at the Christmas tree in the town square and Radio sees his reflection in a Christmas ornament saying, ”Big Radio in there … That’s a big Radio.”.
So, if the two intersecting planes are perfectly flat, polished, somewhere between 25 and 30 degrees …
... and I can make Barbie® spills ... I guess I can easily chop mortises!
Next up … mortise and tenon joints and tapering the legs. Thanks for looking, more to come!
Hepplewhite Stand #1: What's Wrong With This Picture
Hepplewhite Stand #2: First Things First
Hepplewhite Stand #3: Lay-Out & Rough-Cut
Hepplewhite Stand #4: A Proper Edge
Hepplewhite Stand #5: Mortises - Finally!
Hepplewhite Stand #6: Frame Members Sized for Tenons
-- Ron, Lilburn, GA