Discussion Forums

Paul Leverman

Do you use a concentricity gauge? Is it a commercially made gauge, or home made? Are you happy with the results you get? Are they consistent?

One of the reasons I ask is that I have one that I made many moons ago. It is a basic V-block design, sort of. The rear block is more of a large radius knife edge, as opposed to a "V", that the extractor groove sits on. The opposite end has V groove block situated in a slot for length adjustment. It just clamps to the bench with a C-clamp. The dial indicator sits independent of the gauge, something I think I'm going to re-vamp by mounting the whole thing on a steel base.

So are V-block gauges acceptably accurate? I saw one homemade gauge (was it here?) where the rather ingenious fellow mounted acorn nuts to a steel plate. Nice design, simple, solid. I would guess it is deadly accurate, as the engineering practices that go into it are nearly perfect. I have tried to find a detailed pic of the Sinclair model, but none really show how it's made and the Hornady is a different critter all together.

So what do you all use?