Telescoping Gage Expectations

Jake M said:
If you're interested in doctoring up a cheap set (which does work, it's just time....), here's a quick video that will show you what the problems are, where the springs shoot out from, and how to get them back together again.

Click to expand...
Thank you so much man
 
I have bought a cheap (20 $) telescopic gauge set some years ago. I compared them to my inner micrometers for a month. After a few days (learning period), they produced the same results.
I do not measure the size on the telescopic gauge because it seems that the force of the micrometer (0.5 mm pitch) is to much for my telescopic gauges. I now set the micrometer to the requested size and feel how the telescopic gauge fits. I also measure twice, pickup the size using the gauge and measure the gauge using the micrometer, to be sure.
 
I have a set of Mitutoyo and a set of very cheap offshore ones.

The Mits are great. After knowing what they *should* feel like, come cleaning, some stoning and the offshore ones and *nearly* as smooth. They fall down in the fittment department of the telescoping section, so they are a little less repeatable. Can still measure to .001 with them

[update] Thanks @tim81 for posting Tony's video. It shows how I tuned my offshore gauges up. The Mit gauges didn't need it....
 
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Huub Buis said:
I have bought a cheap (20 $) telescopic gauge set some years ago. I compared them to my inner micrometers for a month. After a few days (learning period), they produced the same results.
I do not measure the size on the telescopic gauge because it seems that the force of the micrometer (0.5 mm pitch) is to much for my telescopic gauges. I now set the micrometer to the requested size and feel how the telescopic gauge fits. I also measure twice, pickup the size using the gauge and measure the gauge using the micrometer, to be sure.
Click to expand...

This is whats nice about the quality brands , I hate some second hand mitutoyo ones and they repeat on measurement to better than 0.001"

Some of the cheaper ones can probably be finessed to good working order but I have had very very cheep ones where the machining of them was beyond saving.

Stu
 
stupoty said:
This is whats nice about the quality brands , I hate some second hand mitutoyo ones and they repeat on measurement to better than 0.001"

Some of the cheaper ones can probably be finessed to good working order but I have had very very cheep ones where the machining of them was beyond saving.

Stu
Click to expand...
It’s like cheap adjustable parallels: they are accurate, but the dovetails are full of grinding dust - take them apart, clean, lightly lube and they’re great.
 
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tim81 said:
I found this one from china, how does this one compares to the telescopic gauge.

m.banggood.com

[US$44.99 17% OFF] 50-160mm/0.01mm Metric Dial Bore Gauge Cylinder Internal Small Inside Measuring Gage Test Hand Tools from Tools on banggood.com

50-160mm/0.01mm Metric Dial Bore Gauge Cylinder Internal Small Inside Measuring Gage Test
m.banggood.com m.banggood.com

I am looking for tools. I also have a b&s 420cc that needs a rebuild.
Click to expand...
Better. Easier to check taper & out of round. Smallest bore measureable is 50 mm or 2” though. Buy both types.
 
I got this one on Amazon. I got both the telescopic and the bore gauge. So can check measurements and use mean value if needed.

Here is the used b$s 420cc
 

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