Okay. Here's a truly horrible drawing, but it should demystify the basics of how to begin contouring handles.
STEP 1: take your block of handle wood and actually draw your handle shape on it. This is the back view. It helps to do the sides as well so that you can visualize the finished handle.
STEP 2: mark your layout lines. Palm swells and contours have a point where they are fattest and a point where they are skinniest. These are your horizontal lines. They are the key to the shaping process.
Now draw lines connecting the skinny pinch points to the fat swell points. You are left with the areas of the green triangles.
STEP 3: Hog out the wood in the green triangle areas. You want to remove all of the wood in the green areas, leaving a handle that is shaped like the blue area.
Make sure the blue points are the same on the left and right sides of the handles. This is how you control your symmetry.
STEP 4: Now we begin rounding off all the high spots and knocking off the corners. On a belt sander this would be the slack belt stage. With files and rasps this is the finesse stage. We are creating rounded curves. We are removing all of the blue leaving the handle at the yellow dimensions.
STEP 5: Hand sanding. Hand sand the yellow areas and fine tune the flow of the lines and the symmetry.
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