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Mortise wood chisel,how to build a paddleboard rack,custom wood carved doors,deck rail flower box plans - For Begninners>

Even though the chisel dates back to the dawn of woodworking, it can still do a lot of things for you today.
If you buy a wooden-handled chisel and you'll be using a mallet on it, look for one with a leather washer between the bolster and the handle to help absorb shock.
One other factor that should be mentioned with regard the mortice chisels is that the primary bevel is at about 20 degrees and the final microbevel is at 30-35 degrees. Most of my bench and detail chisels have a 30 degree bevel since I work in hard wood, but this is also a reflection of the steel used (laminated for Japanese and A2 for Blue Spruce).
In general I keep my chisel bevels at the lowest angle which will sustain an edge for the work I expect of them. For my older Sorby paring chisels, this means that I use somewhere between 20-25 degrees of a primary bevel and a micro bevel of a few more degrees. This second picture shows all four I have [other than the newer sash mortise chisels I have]. I use a convex shape to thrust the chisel slightly forward as it deepens the mortise, but the more rounded top of the bevel is as Larry says, to aid in leveraging the waste out.

I think wider chisels hold up better because the pressure (stress) on the edge is less (driving force is usually the same).
You'll hear references to the firmer chisel (an ordinary, general-purpose chisel with a blade 3-5" long), butt chisel (a shorter chisel), framing chisel (a wider, heavier one), mortise chisel (a longer version), paring chisel (one with a long, flexible blade), and more. You'll do better to pick a chisel by looking at it and assessing how well it fits your needs than by relying on a name.
If it curves up as shown in the illustration at right, the chisel may be hard to control and won't cut cleanly. First, hold the chisel vertically to make a cut extending each side to the corner, as shown at right. Toward the bottom of the rabbet, turn the chisel over, and work with the bevel flat against the wood.
Actually, the curve I try to maintain is more of a rounded heel on the bevel and I use this as a fulcrum when levering out waste during the initial mortising. When the micro bevel grows, the chisels are redone to the primary angle and the whole thing begins again.

As I hand sharpen after grinding [no matter the chisel type] and rarely need to regrind, only following the grind can I know what the actual bevel degree is. You can use the chisel to clean off dried glue squeeze-out, pare down a tenon to fit a mortise, or trim a plug flush to a surface. Holding the chisel perpendicular to the surface with the back of the blade to the line, cut to the required depth.
A scrapwood gauge block, shown, guides the chisel straight into the end of the dado for a flat bottom.

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05.10.2013 | Author: admin

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