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#Post#: 55701--------------------------------------------------
PRECISION TELESCOPIC T BORE GAUGE SET
By: Chainsawrepair Date: March 18, 2015, 6:59 pm
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Randy had posted he used these for measuring bores when
cylinders are off. I thought dang good idea.
6 pc 5/16" - 6" PRECISION TELESCOPIC T BORE GAUGE SET
Save some $$$ over the amazon link
HTML http://www.ebay.com/sch/i.html?_odkw=6+pc+5%2F16%22+-+6%22+PRECISION+TELESCOPIC+T+BORE+GAUGE+SET&_sop=15&_from=R40&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.X+PRECISION+TELESCOPIC+T+BORE+GAUGE+SET.TRS0&_nkw=+PRECISION+TELESCOPIC+T+BORE+GAUGE+SET&ghostText=&_sacat=0
#Post#: 55714--------------------------------------------------
Re: PRECISION TELESCOPIC T BORE GAUGE SET
By: srcarr52 Date: March 19, 2015, 9:28 am
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You still need a set of micrometers to measure the snap gauge.
Still these are prone to error and the measurement process is
arduous.
Industry standard is a dial bore gauge (still need mics). There
are some pretty decent cheap sets out there that do 2-6" with
0.0005" increments.
HTML http://www.ebay.com/itm/Igaging-Engine-Cylinder-Dial-Indicator-Bore-Gauge-2-6-/141472741994?pt=LH_DefaultDomain_0&hash=item20f06eba6a
Or extender series stuff which has an extra head that goes done
to 1.4".
HTML http://www.ebay.com/itm/Fowler-Cylinder-Dial-Bore-Gage-1-4-to-6-/111608389384?hash=item19fc60df08&item=111608389384&pt=Motors_Automotive_Tools&vxp=mtr
Or you can get more precise ones in 0.0001" increments.
HTML http://www.ebay.com/itm/2-6-x-0-0001-Dial-Bore-Gauge-Set-Brand-New-EE20-1006-/161510210358?pt=LH_DefaultDomain_2&hash=item259ac23b36
I personally have a 1.4-6" set with a digital gauge that reads
in 0.00005" increments. It's way overkill.
#Post#: 55721--------------------------------------------------
Re: PRECISION TELESCOPIC T BORE GAUGE SET
By: Chainsawrepair Date: March 19, 2015, 11:11 am
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I had seen those you mentioned when looking. I know they looked
like the right tool to be using. Thanks for sharing that info.
#Post#: 55761--------------------------------------------------
Re: PRECISION TELESCOPIC T BORE GAUGE SET
By: Al Smith Date: March 19, 2015, 9:57 pm
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I've got them from about 1/4" up to 6" .I've got micrometers up
to 8" mostly Starett .One set ,1-2"came from England with my
great grandfather circa1900 .
#Post#: 55987--------------------------------------------------
Re: PRECISION TELESCOPIC T BORE GAUGE SET
By: 3000 FPS Date: March 24, 2015, 5:25 pm
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I have a set of those also. I also have the micrometers for
reading them. They do work good.
#Post#: 55989--------------------------------------------------
Re: PRECISION TELESCOPIC T BORE GAUGE SET
By: 660magnum Date: March 24, 2015, 6:39 pm
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I have the setup like in the first post as well as the mikes
#Post#: 55992--------------------------------------------------
Re: PRECISION TELESCOPIC T BORE GAUGE SET
By: dannyupsolate Date: March 24, 2015, 11:50 pm
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i agree with all of you and the bore indicators are great for
out of round or dished out bores. I do want to challenge you to
check your micrometer against a newish decent quality electronic
caliper. I did not believe in them till I had to use a 36 inch
pair for a year and get parts through quality control. Keep
yourself honest with a mic once in a while but once you get used
to the feel of the caliper it should be easy to get accurate
results from a 2 to 3 inch T gauge.
#Post#: 55994--------------------------------------------------
Re: PRECISION TELESCOPIC T BORE GAUGE SET
By: srcarr52 Date: March 25, 2015, 9:35 am
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[quote author=dannyupsolate link=topic=4772.msg55992#msg55992
date=1427259015]
i agree with all of you and the bore indicators are great for
out of round or dished out bores. I do want to challenge you to
check your micrometer against a newish decent quality electronic
caliper. I did not believe in them till I had to use a 36 inch
pair for a year and get parts through quality control. Keep
yourself honest with a mic once in a while but once you get used
to the feel of the caliper it should be easy to get accurate
results from a 2 to 3 inch T gauge.
[/quote]
A caliper, digital or not, will never replace a micrometer.
Because of the slide action and the lever arm you have on it
from the measurement surface it's too easy to blow the reading a
few thousands with little pressure difference on the thumb
wheel. Even though the digital calipers can read in 1/2
thousands there precision is around 1.5 thousands. Measure the
same part 10 times with your eyes closed and see how much your
measurements vary, you'll be surprised.
Snap gauges are only used in cases where a dial bore gauge
cannot as they are much more prone to imprecision from human
error since there are two stages in the measurement left to feel
of the user.
If you use a dial bore gauge you don't need expensive
micrometers, just solid ones. As you just use them to transfer
the piston diameter to the bore gauge, then you take a clearance
measurement.
#Post#: 55995--------------------------------------------------
Re: PRECISION TELESCOPIC T BORE GAUGE SET
By: dannyupsolate Date: March 25, 2015, 10:38 am
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You are correct but after quality control chewed me out 10 times
and threatened to fire me. I learned to feel that caliper right.
A caliper with any wear on the rails will behave exactly as you
said. What amazed me was the electronic calipers really were
better than my trusty old dial caliper. Some people will get
the feel right some wont. Thank you for participating in my
experiment and posting your results.
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