measuring valve guide i.d. with digital dial bore gauge.
measuring valve guide i.d. with digital dial bore gauge.
(OP)
Hello all,
The facility that I work at requires valve guide wear to be measured before and after engine testing is performed. One of my co-workers does this procedure and using a digital dial bore gauge with a seperate but wired button to snap shot the reading onto a computer for proper documentation and instant calculation of stem to guide clearance once the stem diameters are inputed as well.
When I have done this in the past I have used an analog dial bore gauge and always found the point that the needle changes direction to indicate the tightest spot. This employee in question inserts the gauge and pushes the button to record the data and never looks at the gauge reading at all. The gauge does not appear to be self centering. My question to you is...does a self centering one exist or should he be looking at his numbers before pulling the trigger? I played with the gauge the other day and managed to get a variance of .070 from one extreme to the other.
Good day,
The facility that I work at requires valve guide wear to be measured before and after engine testing is performed. One of my co-workers does this procedure and using a digital dial bore gauge with a seperate but wired button to snap shot the reading onto a computer for proper documentation and instant calculation of stem to guide clearance once the stem diameters are inputed as well.
When I have done this in the past I have used an analog dial bore gauge and always found the point that the needle changes direction to indicate the tightest spot. This employee in question inserts the gauge and pushes the button to record the data and never looks at the gauge reading at all. The gauge does not appear to be self centering. My question to you is...does a self centering one exist or should he be looking at his numbers before pulling the trigger? I played with the gauge the other day and managed to get a variance of .070 from one extreme to the other.
Good day,





RE: measuring valve guide i.d. with digital dial bore gauge.
RE: measuring valve guide i.d. with digital dial bore gauge.
Good day,
RE: measuring valve guide i.d. with digital dial bore gauge.
RE: measuring valve guide i.d. with digital dial bore gauge.
Is it your responsibility.
If you conclude he is inaccurate, what can you do and what will you do.
Presuming you can and should do something, how about, without his knowledge, sending a few heads through a second time to see how repeatable his results are.
Regards
eng-tips, by professional engineers for professional engineers
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RE: measuring valve guide i.d. with digital dial bore gauge.
Good day,
RE: measuring valve guide i.d. with digital dial bore gauge.
Rod
RE: measuring valve guide i.d. with digital dial bore gauge.
RE: measuring valve guide i.d. with digital dial bore gauge.
RE: measuring valve guide i.d. with digital dial bore gauge.
I stick by my comment, if it is your place to do so, send some back to test his consistency.
If it is not your place to do so, you could very easily end up with a lot of egg on your face.
Despite your intentions to protect the company, it might be seen as disloyalty toward a fellow worker and undermine the trust others might have of you.
I might be way off base, but that was the feeling I got from reading your OP.
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: measuring valve guide i.d. with digital dial bore gauge.
RE: measuring valve guide i.d. with digital dial bore gauge.
RE: measuring valve guide i.d. with digital dial bore gauge.
We can't tell from here if the individual in question is highly skilled and productive, or fast and sloppy, or enthusiastic and sufficiently skilled but lacking a proper procedure.
We also can't tell if any of this is your responsibility, or not.
Mike Halloran
Pembroke Pines, FL, USA
RE: measuring valve guide i.d. with digital dial bore gauge.
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RE: measuring valve guide i.d. with digital dial bore gauge.
I know, too many toys already.
Rod
RE: measuring valve guide i.d. with digital dial bore gauge.
RE: measuring valve guide i.d. with digital dial bore gauge.
In my experience many accepted measurement practices on the shop floor are only just able to measure the difference bwteen production parts, repeatably.
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: measuring valve guide i.d. with digital dial bore gauge.
The other methods mentioned such as airgauging etc are good for a production setting. But in the experimental setting you would want accurate information on the internal profile, and the best way to achieve that is with a CMM. Anything else as mentioned is just an old shop mechanics way of checking the bores. If this is done for a small quicky engine shop then go with any old standard way of measurement. But if this is a large OEM then use something that is going to give accurate data.