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I use these things a lot and I own many different brands. Starret though, is the worst and most inconsistent. My Mitutoyo snap gauges are superior in every way. Since feel is what accuracy is all about with these and my Mits are really smooth, my readings are consistent and that gives me confidence when using them.
I've often wondered why the non movable part isn't cylindrical at the end instead of rounded. Would eliminate almost all the need for "wiggle".
I've often wondered why the non movable part isn't cylindrical at the end instead of rounded. Would eliminate almost all the need for "wiggle".
With a full set of micrometers that have rounded anvils of different radiiHow would you use that?
With a full set of micrometers that have rounded anvils of different radii
Or you could trig it out. That'd be convenient ....
Yeah, I don't think Gordon is going to sell very many of his new invention.I can see some problems already before you get the telescope out of the hole..
I've often wondered why the non movable part isn't cylindrical at the end instead of rounded. Would eliminate almost all the need for "wiggle".
To the OP: The difference lies in the minimum range; with two telescoping sections, the smallest gage can measure down to 5/16" in the 579 set, vs. 1/2". Also, with two telescoping arms, you can move the handle sideways in both directions; if the need arises in some situation where you need to measure an offset bore down inside another bore, it's an additional element of convenience.
I have a set of Yuasa telescoping bore gages that I really like, probably late 70's-early 80's made in Japan, pretty smooth, and longer handles than most of the other standard telescoping gages. Nice satin chrome finish as well. EBay find a few years back.
I can't imagine how this would work; if I understand the concept, you would have a cylindrical end face as a contact for the inside of a cylindrical bore instead of a point contact of the standard spherical end? You'd get proportionally different results for every different size bore within the range of a given gage. Am I missing something here?
I don't know if you're missing something or not. Forget the word "cylidrical" and think of a small radius running the length of one contact surface instead of two rounded contact surfaces.
With two rounded contact surfaces wiggle is needed to get the "smallest reading". If one contact point is as I showed in the sketch then this would IMO stabilize the gauge and need as good as no wiggle.
I've done this with inserts I had made and it worked really well. If necessary I can take pictures of the inserts I used. They can't though be used for a internal diameters/recesses less than 35mm/1.375".
With a telescoping gauge I can imagine much smaller diameters possible.
If it helps try thinking about how the internal measurement jaws of a caliper works. Not much wiggle needed. They can't measure deep though.
The way he drew it is not possible. It's got to roll in the other axis, too. If you made the high spot on the leg into a point it could work, but that's basically what they are now. And a point would dig in to softer materials, where a section of a sphere (what they are now) slides across the surface. No advantage, lots of disadvantage.OK, now I have the picture. That would likely require a fixed arm (only) for the line contact side, to maintain the axis alignment of the line contact to the handle, and it would be sensitive to both axes of in-plane tilt. The line contact section would likely need to have a bit of length to make it worthwhile, IMO. As MattiJ notes, getting it out without disturbing the result would be a challenge; probably an opportunity for making an accessory to hold the gage centered and square during measurement and retraction.
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