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Micrometres

Bevel on anvil

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bullgoose24/02/2020 10:49:18
3 forum posts

Hi Folks.

I wonder if anyone can help clear up a question about micrometre anvils having a bevel ground on them.

I have bought a Mititoyo instrument and the anvils are perfectly flat leaving them with a very sharp cutting edge which I find marks the work even when being very careful.

All 5 of my other Mititoyo and Moor and Wright instruments have a bevel ground on the anvil edge. Is my new Micrometre faulty ?

Thanks

ega24/02/2020 10:58:11
1511 forum posts
123 photos

You need a sharp edge for some purposes eg measuring the tip width of a screwcutting tool.

Jeff Dayman24/02/2020 11:58:15
1762 forum posts
45 photos

Mr Bullgoose - when using the micrometer are you using the small knob and ratchet on the end of the knurled knob to tighten the micrometer on the work? This will control the measuring force and unless the material you are using is very soft there should be no work marking. The other effect is that if you always use the ratchet your measurements will be more consistent and probably more accurate.

You can of course use a piece of drink can sheetmetal or shim stock of known thickness wrapped once over your work to reduce marking it, if you remember to subtract twice the sheetmetal thickness from the measurement. Gauge blocks can be used same way, but are harder to hold and you may not have a set, where sheetmetal is available pretty much everywhere and will hold its' shape my itself on the work.

Emgee24/02/2020 13:45:23
1406 forum posts
212 photos

One reason for the anvil marking the work is because the work is tapered, a good quality micrometer will always show this fault with the work and will allow the tool to swivel around the largest diameter, if it doesn't feel snug when taking a reading something is wrong.

Measure a ground milling cutter shank to see if there is any difference in feel when closing the anvil onto the cutter.

Emgee

old mart24/02/2020 15:04:37
1251 forum posts
116 photos

There is nothing preventing you from very carefully putting a tiny bevel on the anvils with a fine diamond lap, say 800 grit. Make sure you don't spread the super fine abrasive particles about by using a little oil and cleaning afterward carefully.

John Haine24/02/2020 15:48:03
2904 forum posts
149 photos

Some micrometers measure to micrometre precision

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