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post #21 of 26 Old 10-07-2013
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Re: Measuring Tool

A dial gauge while useful will only tell you the degree of ovality of the cylinder and a rough idea of the wear comparing the very top part with the worn part.

Pros will use an inside mike to measure the actual inside dia.
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post #22 of 26 Old 10-07-2013
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Re: Measuring Tool

Well

I have honed a thing or a 1000 over the decades and we always have ring gauges to set the bore gauge (dial gauge) or there not really of much use

The three point internal micrometers are pretty pricy and have very limited ranges

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post #23 of 26 Old 10-07-2013
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Re: Measuring Tool

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Originally Posted by Frogwatch View Post
Would the "inside jaws" of a set of calipers work? Everybody should have a pair of calipers. How else you gonna measure really accurate stuff. Unfortunately, modern calipers are all in units of mm or inches and not RCH.
Besides not going deep the accuracy on a set of calipers isn't that great. Repeated measurements, especially using the inside jaws, are often off by a couple thou (or tens of millimeters) from each other. A micrometer or bore gauge is more accurate.

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post #24 of 26 Old 10-07-2013
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Re: Measuring Tool

The picture is of my inside micrometers, something I've barely ever used. When we did bore work we used a dial bore gauge that was referenced to a known I.D. It was much quicker to check the bore at different depths with the dial bore gauge. When honing the key is to create a nice straight bore, it's very easy for it to become fat in the middle if you dwell too long with a hone. Frankly a proper honing machine is the best way.
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post #25 of 26 Old 10-07-2013
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Re: Measuring Tool

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Originally Posted by wind_magic View Post
They do make calibration tools for this though, I just found that out yesterday. It is called a "master ring gage" which is a circle with a known size that comes in different levels of accuracy.

Well, I have been in engine repairs one way or another for four decades and have to acknowledge never having seen those before. You learn something new every day.

I would venture to suggest though that the expansion in a ring like that would well exceed that of a straight distance piece for the same temperature change. Which is probably why it's marked with the temperature at which it is accurate.

I have no scientific reason for saying that - I just remember heating ring gears to expand them before shrinking them onto a flywheel. It doesn't take a lot of heat to make the ring gear significantly over-size.

I wonder if these rings come with a "deviation chart".


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post #26 of 26 Old 10-07-2013
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Re: Measuring Tool

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Originally Posted by wind_magic View Post
They do make calibration tools for this though, I just found that out yesterday. It is called a "master ring gage" which is a circle with a known size that comes in different levels of accuracy.

You are absolutely right, a bore gage with a ring gage to calibrate is the ultimate (unless you have a CMM on board). I will allow you to take several calibrated measurements quickly and will take operator "feel" out of the equation for the most part. However, if you want to get measurements within a few tenths in the most economical fashion for a one off job, a telescoping gage with an outside mic is the way to go.
A dial gage can be very accurate (every bore gage uses one) and is great to measure your shaft run out, but by itself is of no use for this job.

Last edited by dillybar; 10-07-2013 at 11:52 PM. Reason: lack of focus
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