How to set up a dial bore gauge against bearing?

This topic has 5 replies, 4 voices, and was last updated 14 May 2012 at 14:34 by colin hawes.

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14 May 2012 at 11:32 #6145
PekkaNF
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@pekkanf
Bore gauge setting using a bearing instead of gauge blocks?
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14 May 2012 at 11:32 #90777
PekkaNF
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@pekkanf
Hello,

I got small bore gauge (18-35 mm or so).Tried to set it with a micrometer. Fiddly at it's best and even tought I don't need exact reading (mike bearing, lock the mike and use it to set the gauge) I don't feel overly confident with it.

Is there a method or design to use a bearing as gauge block to set a bore gauge? Some kind of self made fixture?

Actually was thinking of this kind of combo, but its pain to clear it from customs:

Bore Setter

If I just could "clamp" a bearing and use it's OD to set the dial bore gauge, without too much complications. I did came up with a plan of making sort of clamp, using ground rods as guides, but this is not very unique need, therefore I'm missing something obivious or someone has allready come up with tested design.

Or is it just a matter of putting mike into a stand and use mike?

Pekka

Edited By David Clark 1 on 14/05/2012 12:08:10
14 May 2012 at 11:50 #90780
David Littlewood
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@davidlittlewood51847
Pekka,

I looked at the setting gauge you mentioned; it occured to me that you could achieve the same result using a conventional height gauge on a surface plate. With my gauges at least, the base of the scriber is at the gauged height. The only disadvantage would be the need to hold the height gauge down while adjusting the bore gauge; a lead weight might be useful.

David
14 May 2012 at 12:31 #90786
Speedy Builder5
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@speedybuilder5
It might help if you held the mike in a home made clamp/stand – perhaps made of wood so you don't damage the mike. That woulod leave both hands free to manage the bore gauge.
14 May 2012 at 13:45 #90793
PekkaNF
Participant
@pekkanf
Thank you all,

I tried a mike and dial bore gauge against bearing and fitting needle bearing ring. I think I got hang on it, but I'm missing a lot of experience and confidence. Didn't have such luck with telecopic gauge, alot of feel and there must be certain technique involved.

I have a surface plate, but not any reasonable height measurement equpment. As David explained, there is certain amount force involved, mine has "centering" clips with surpricing strong spring. I think this would be my plan "B".

John, thank you. If mike works for you, I know that it should be good enough for me too. Need some more practice. Sorry, I don't get this part of your text "With a mic, all I do is set the lowest size of the gauge, and lock the mic up."

I think it's same drill I'm practising (please point out if I'm doing something less than gracefull way):

1) Mike out outer diameter of the bearing.

2) Lock mike carefully, when I'm happy with the feel with bearing race.

3) Raid the box of bore gauge anvills to get decent reading (measurement range is 3 mm).

4) "Zero" in reading of the dial. I noticed that it pays off to actualy clamp the mike and bezel…once the gauge slipped out of mike and my zero was off imediatelly.

On practice run I had set/checked before mike with 25.00 gage, mike reading come reassuring close to 28.00 mm. I think that actual reading errot here does not matter, because the same mike is used to set the bore gauge.

Now there is one detail, I have been wondering: What is acepted way of setting the bore gauge dial to account for a fit?

My first instict would be to deside the fit and account it zeroing the dial, when checking bore. "Zero" would be my goal and my target would be to limit my actions + or – side of it.

Then again, it might be easier to set bore gauge to zero and keep mental record how many division more or less relative to zero I'm aiming at. There are tolerance clips, but at closer fit things get crowded.

I'll be practising some more today, and I'm thinkking of building a simple clamp for the mike.

Pekka
14 May 2012 at 14:34 #90798
colin hawes
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@colinhawes85982
When I need to produce a small accurate bore with a boring bar I usually find it best to make a plug gauge first with a lead diameter 0.002 smaller than the rest of it.The smaller diameter gives a good idea of how close I am to the finished size . Just thought I'd mension it as a useful tip to beginners!
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