Vee micrometer

[Graeme SeedParticipant @graemeseed34272]

Hi All, I have a Newton Vee Micrometer and the V is not 90 degrees, more like 91 degrees. Probably wear? It has 1.75- 2.75″ hand stamped on it. I’m considering making a milled square with one milled corner edge to be able to set heights of slip gauges. It has a 0-1 Moore and Wright stem micrometer on it.  I  can’t find any info about Newton company, British, Canadian, or USA made.  There’s a patent number inscribed with the makers name, 397631, but I’ve tried various patent offices with no luck. It’s very old and would love to know any history. Many thanks, hy toolman.

[Michael GilliganParticipant @michaelgilligan61133]

https://worldwide.espacenet.com/patent/search?q=pn%3DGB397631A

 

PDF file downloadable from there ^^^

Follow the three-dot menu at upper right of page

MichaelG..

[JohnFParticipant @johnf59703]

Hi Graeme,

Most use is measuring 3-flute cutters or similar but here is a link explaining : –

https://www.higherprecision.com/blog/what-is-a-v-anvil-micrometer

[old martParticipant @oldmart]

I would very much doubt that the angle of the vee was due to wear, you would first need a ground test piece of 1.75″ diameter or more that you can compare with both your vee mic and a standard one. Probably intended for measuring turned diameters rather than three flute tooling which would need a 60 degree vee. Check out tooling that you may have that already that has a  ground cylindrical diameter within the vee mics range to test it

[Graeme SeedParticipant @graemeseed34272]

Hello, many thanks for your reply posts. Michael, the patent you found contains all that I need, thanks. 1933 tool from Barnsley, 1/2 hour from me! The off 90 is shown in a photo and the Vee sides are one polished, the other has horizontal lines but is smooth, no burrs etc. It can’t measure 3 flutes, that needs to be a 60 Vee. I can set it to zero with ground stock but this tool is not for this purpose. It’s to set and adjust the tool tip of boring bars. If anyone cares to read the link Michael sent, it’s an eye opener.

[peak4Participant @peak4]

I have four of these, bought at a batch for very little money a couple of years ago.
Mine are well worn, with comparatively deep grooves in the V faces; three seem to be near enough right angled, but one, like yours, is a degree or so off.

I was considering re-grinding the V faces on a small Herbert Junior, but have been putting the job off until I can come up with a way to ensure the two refurbished faces will have exactly the same amount taken off, whilst still retaining the 90° angle, and being equidistantly aligned to the axis of rotation of the micrometer head.

Unlike more sophisticated grinders, the Herbert only has a micrometer adjustment on the vertical axis, so front to back needs a dial gauge and careful handle twiddling, with no feed lock.

Bill

[JasonBModerator @jasonb]

I can’t see that the Vee angle is particularly important on these as it is really only to put on a cut not take an actual diameter reading and any reading will deepend on the diameter of the boring bar. Therfore so long as the bar sits nicely in a vee it should work as intended

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