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The glazing rabbet |
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The molding (ovolo in this case) |
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A good looking sash joint. |
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The sash fillister references the front face to cut the glazing rabbet |
To cut the glazing rabbet, therefore, you need a sash fillister. This plane references the inside face, using the fence, and cuts with the inside left corner of the iron to cut the rabbet. It "leapfrogs" the area into which the molding is cut (rabbets are usually cut before the molding, this is just a demo piece that I had made before).
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This is why a moving fillister doesn't work. |
A moving fillister can be used to cut the glazing rabbet, if you reference the "wrong" face and cut against the grain. As you might guess, the molding plane works best when planing with the grain, so the aesthetically important molding demands that the grain run in a friendly fashion for that cut. If you cut with a moving fillister from the back face, you run the wrong way and you risk tearing out. Admittedly, this isn't all that important, but it sure is easier work to plane the right way.
So, if you want to make sash by hand, you need a sash fillister. If you just want to buy a neat old plane, you need a sash fillister. If you want to power abrade your work into submission and set up your dado stack to cut your glazing rabbet, you probably don't need a sash fillister.