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Any decently sized metropolitian area should have a shop that just calibrates stuff. In Boise Idaho we have Boise Calibration Services. A couple of places I have worked have needed various instruments that have needed regular calibration and they all used Boise
Calibration. I currently have a couple of digital 0-1000 PSI pressure gauges used in R stamp pressure vessel hydro tests that go in once a year for calibration. It may be expensive for just a tire gauge, but it shouldn't be hard to find someplace that can
do it.</div>
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<a href="https://boisecal.com/" id="LPlnk">https://boisecal.com/</a></div>
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Brian</div>
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Nampa, ID</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Shop-talk <shop-talk-bounces@autox.team.net> on behalf of Jeff Scarbrough <fishplate@gmail.com><br>
<b>Sent:</b> Saturday, April 27, 2024 2:37 PM<br>
<b>To:</b> Pat Horne <patintexas@icloud.com><br>
<b>Cc:</b> Shop-talk@autox.team.net <Shop-talk@autox.team.net><br>
<b>Subject:</b> Re: [Shop-talk] Tire Gauges</font>
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<div dir="ltr">I actually have one of those machines, and I suppose I could do some plumbing to attach it to a Schraeder valve to pressurize the gauge.<br>
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I might just do the rounds of TPMS gauges to see which one most matches those and calibrate everything else to that one.
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<div>Thanks for everyone's suggestions!</div>
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<div dir="ltr" class="x_gmail_attr">On Fri, Apr 26, 2024 at 10:29 PM Pat Horne <<a href="mailto:patintexas@icloud.com">patintexas@icloud.com</a>> wrote:<br>
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<div dir="auto">Many years ago I worked in the Chemical Engineering Department at UT Austin & in their main lab they had an hydraulic/weight calibrator for pressure gauges. If you have a university nearby you might give them a call. Rather than calibrate the
entire gauge, you could just find out what one gauge reads @ the tire pressure you use & calibrate any other ones to that gauge.
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<div>Peace, Pat</div>
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<div dir="ltr">Pat Horne
<div>We support Habitat for Humanity</div>
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On Apr 26, 2024, at 5:36 PM, Bob Spidell <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>> wrote:<br>
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<div dir="ltr"> I can name at least one place off the top-of-my-head that can calibrate torque wrenches, but not one that I know of that can calibrate pressure gauges (I do think some laboratories can do it).<br>
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I have several analog gauges that don't agree (one is adjustable). I have 3 Accutire digital gauges that all agree with each other and my Mustang's TPMS; at least I have repeatability. I set tire pressure according to how the tires wear.<br>
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<div>On 4/26/2024 10:26 AM, <a href="mailto:alfuller194@gmail.com" target="_blank">
alfuller194@gmail.com</a> wrote:<br>
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<p class="x_MsoNormal"><span style="font-size:11pt">Sorry for the late reply – I have no idea where several weeks’ worth of messages have been hanging out!<u></u><u></u></span></p>
<p class="x_MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="x_MsoNormal"><span style="font-size:11pt">It might be worth checking with someone who already has their gauges calibrated and comparing readings. I would hope the new car dealers service department would actually calibrate gauges used on customer
cars, but would ask to be sure. It also occurs to me that last time I moved the movers damaged my air compressor, and the insurance company has a local company that repairs them. I wonder if they have calibrated gauges, and if one could compare readings with
theirs…<u></u><u></u></span></p>
<p class="x_MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="x_MsoNormal"><span style="font-size:11pt; font-family:Calibri,sans-serif">-----------------------------------<u></u><u></u></span></p>
<p class="x_MsoNormal"><span style="font-size:11pt; font-family:Calibri,sans-serif">All the best,<u></u><u></u></span></p>
<p class="x_MsoNormal"><span style="font-size:11pt; font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="x_MsoNormal"><span style="font-size:11pt; font-family:Calibri,sans-serif">Al Fuller<u></u><u></u></span></p>
<p class="x_MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
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<p class="x_MsoNormal"><b><span style="font-size:11pt; font-family:Calibri,sans-serif">From:</span></b><span style="font-size:11pt; font-family:Calibri,sans-serif"> Shop-talk
<a href="mailto:shop-talk-bounces@autox.team.net" target="_blank"><shop-talk-bounces@autox.team.net></a>
<b>On Behalf Of </b>Jeff Scarbrough<br>
<b>Sent:</b> Sunday, April 7, 2024 1:13 PM<br>
<b>To:</b> Benjamin Zwissler <a href="mailto:bjzwissler@gmail.com" target="_blank">
<bjzwissler@gmail.com></a><br>
<b>Cc:</b> <a href="mailto:Shop-talk@autox.team.net" target="_blank">Shop-talk@autox.team.net</a><br>
<b>Subject:</b> Re: [Shop-talk] Tire Gauges<u></u><u></u></span></p>
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<p class="x_MsoNormal"><u></u> <u></u></p>
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<p class="x_MsoNormal">I know that one foot of water column equals 0.433 psi. So about 70 feet of 2" pipe attached to the side of a tall building with a thin diaphragm over a chamber with a Schrader valve should get you close. Might need to make a manometer
out of it, so you'll need more pipe.<u></u><u></u></p>
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<p class="x_MsoNormal"><u></u> <u></u></p>
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<p class="x_MsoNormal">It's low cost, but not very practical. I did have a set of weights and an oil reservoir for calibrating liquid pressure, but liquids are not (for our purposes) compressible and air is. So I don't know how accurate that might be.<u></u><u></u></p>
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<p class="x_MsoNormal"><u></u> <u></u></p>
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<p class="x_MsoNormal">If you had some mercury, a 5 foot column should do the trick. Don't tell the EPD, though.<u></u><u></u></p>
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<p class="x_MsoNormal"><u></u> <u></u></p>
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<p class="x_MsoNormal" style="margin-bottom:12pt"><u></u> <u></u></p>
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<p class="x_MsoNormal">On Sun, Apr 7, 2024, 15:37 Benjamin Zwissler <<a href="mailto:bjzwissler@gmail.com" target="_blank">bjzwissler@gmail.com</a>> wrote:<u></u><u></u></p>
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<p class="x_MsoNormal">I calibrate my Milton (which has consistently read high) to my wife's tpms value. Partly because I assume the car is right and partly because I don't like it when she's telling me a week later that she's getting low pressure lights
again. <u></u><u></u></p>
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<p class="x_MsoNormal"><u></u> <u></u></p>
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<p class="x_MsoNormal">I don't know how to create an inexpensive standard for calibration. The Milton is the most expensive gauge I have and has been the least accurate. I looked it up on line and found lots of similar complaints about its inaccuracy. <u></u><u></u></p>
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<p class="x_MsoNormal"><u></u> <u></u></p>
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<p class="x_MsoNormal">Any ideas on creating a low cost pressure standard for calibration?<u></u><u></u></p>
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<p class="x_MsoNormal"><u></u> <u></u></p>
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<p class="x_MsoNormal">Ben <u></u><u></u></p>
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<p class="x_MsoNormal"><u></u> <u></u></p>
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<p class="x_MsoNormal"><u></u> <u></u></p>
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<p class="x_MsoNormal" style="margin-bottom:12pt"><u></u> <u></u></p>
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<p class="x_MsoNormal">On Sun, Apr 7, 2024, 1:49<span style="font-family:Arial,sans-serif"> </span>PM Jeff Scarbrough <<a href="mailto:fishplate@gmail.com" target="_blank">fishplate@gmail.com</a>> wrote:<u></u><u></u></p>
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<p class="x_MsoNormal">So, I have three tire gauges: Accutire electronic, Jayco mechanical, and Milton Inflator hose with gauge. All three report consistently, and all three are 3-4 psi different - low to high in the above order.<br>
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Is there a simple way to check accuracy? <u></u><u></u></p>
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<p class="x_MsoNormal"><u></u> <u></u></p>
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<p class="x_MsoNormal"> Jeff <u></u><u></u></p>
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