The edge of these knurls is sharp and because they are on an angle the
face leads the work so as it rotates and moves forward it slices the
Imagine how you sharpen a pencil at an angle as opposed to trying to
take a full slice off in the vertical plane.
Look out shortly in MEW for an interesting article on these by David
I made a knurl holder like this some years ago by machining a slot in the
end of a piece of hex bar through two points of the hex, so that when
mounted in the tool post it tips the plane of the knurl 30 degrees either
way off vertical. I cut the knurl by planing a piece of 3/4" silver steel
using a screwcutting tool on its side, and dividing from the bull wheel on
the lathe. Wheel was fully hardened after drilling and cutting off, leaving
It cuts nice diamond knurls using two opposite passes and doesn't need the
same side thrust as a pressure (swaging) knurl, which was all that I had at
the time. I now use a clamp type pressure knurl, so hardly ever use it now,
but it gave nice results
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