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HOME WORKSHOP HANDBOOK
Here's how the hand knurlinq tool makes easy work of a typically tough job; knurlinq a small '11 6" brass handle. Use plenty of lubricant.
3-Point Knurling Tool SE THREE rollers to knurl instead of the usual two, and you can add the truly professional appearance of knurling to knobs, instruments, and small ,p arts even if you want to do it without a metal lathe. Ordinarily, knurling is done with a lathe tool, that presses two knurling rollers against one side of the revolving work In knurling, the metal is not cut; rather it is formed, by pressure, and thus it is usually difficult to knurl small parts, especially of soft brass and aluminum. This tool will knurl rods from %" down to 1is"· And because it provides its own pressure, you can use it in your drill press, as well as in the lathe. You can even clamp the work in a vise and rotate the tool by hand. The first step is to buy the knurls, which are available in diamond or straight pattern, from any tool supply house. While they come in coarse, medium, and fine pitch, the fine diamond pattern is your best choice for most small work. If you have a milling machine, or metal cutting band-
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saw, the frame can be made of solid stock. Otherwise, Fig. 2 shows how to make it by riveting together three pieces of steel plate. To make the frame using the latter method, clamp steel plates A, B, and C together, and drill rivet holes in several places. The hole size will depend on the rivets that you have available. They can be made from Ys" cold rolled steel round stock, or you can use #8 finishing nails, which would require a #34 drill. Countersink the holes about lft;4" on each side, and rivet the three pieces together temporarily. Now, scribe the layout on one side, and complete all the drilling. A good method of cutting out the recess for the slide is to drill a series of Ys" holes spaced lfs" apart all around the inside of the outline, with .7."-20 THO.
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PIN GROOVE
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HAND SCREW I"
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Tit 8 RIVETS
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isR £'REAM TO CLEAR KNURL
FRAME ASSEMBLY
SLIDE ASSEMBLY
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DRILL ONE PLATE WITH .*-19 DRILL, OTHER WITH *29 AND TAP *8-32