What type of dial to use in you bore gauge?

Lanza · Jan 23, 2014

Purchased a Mitutoyo 511-713 metric bore gauge of ebay new. It came with a dial indicator of 10mm stroke, 0.01 graduations.
It is a lug type indicator, that's what you get for buying of ebay. It is a standard 2046 indicator. I notice some tenths (inch) indicators that I have used in the past have the positive ccw and the negative cw, which makes sense for a bore.

Just wondering what people prefer?

opscimc · Jan 23, 2014

Lanza said:
I notice some tenths (inch) indicators that I have used in the past have the positive ccw and the negative cw, which makes sense for a bore.

Plus and minus definitely makes sense for a bore gauge. I have the English/American version of the set you have and it came from Mitutoyo with just such a tenths-reading Mitutoyo indicator. I also have various Diatest and Mahr bore gauges covering other size ranges and all of them come with the same type of indicator. I would not be happy using any of them with the type of gauge you have ("let's see, I set the gauge at 0.0100" using a 2.9735" ring gage, and it's now reading 0.0043", so that means my bore is 100 minus 43 added to, or, wait, is that subtracted from?!...").

drgnrider · Jan 24, 2014

We use Indicator: 0-.0250", .0001", Dial 0-5-0

Set the the indicator zero, after one rotation, to mid range of the tolerance, gives the machinist a few rotations and the ability to see if they are still minus on the bore.

microinch · May 13, 2014

Are you looking to change the mm indicator to inch?

You can easily change the lug back for a flat back or just mill off the lug.

I never look at the + or - on the dial. I know that as the indicator hand approaches zero the bore is large, past zero the bore is small.

If the + or - designation on the dial face is going to cause confusion to the operator then remove the bezel and mark the dial face to suit with a sharpie.

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What type of dial to use in you bore gauge?

Lanza

Aluminum

opscimc

Stainless

drgnrider

Aluminum

microinch

Aluminum

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