Posted by John Garner on September 30, 2023 at 11:28:14 from (73.189.36.161):
In Reply to: Hone grit posted by jd2cyl1943 on September 28, 2023 at 17:21:24:
It's worth noting that there are three types of commercial hones, 1) the rigid hone, which usually has two stones and two guide shoes that expand / contract radially without enabling taper, 2) the glaze-breaker hone with three stones and no shoes that will follows a taper, and the ball hone that looks much like a wire-bristle bottle brush with abrasive balls at the ends of the bristles. Bought new, the rigid hone runs several hundred dollars, the glaze-breaker hone runs twenty to forty dollars, and the ball somewhere in between the other two types.
There is also a home-made version, sometimes called a fly-burr hone, that is essentially a partially-split shaft that holds a doubled-back-on-itself sandpaper that is long enough to curl most of the way around the bore being honed. )Sometimes a layer of polyethylene sheet is sandwiched between the layers of sandpaper to make it stiffer.) The shank in chucked in a drill motor, and the sandpaper inserted into the cylinder . . . allowing the sandpaper to work against the inside of the cylinder. To paraphrase John Muir -- the author of the 1960s classic How to Keep Your Volkswagen Alive -- the people who can afford the commercial hones consider fly-burr hones crude. But they do work, and I strongly suspect that the inventor of the ball hone was inspired by the fly-burr hone.
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