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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Many years ago I worked in the Chemical Eng=
ineering Department at UT Austin & in their main lab they had an hydraul=
ic/weight calibrator for pressure gauges. If you have a university nearby yo=
u might give them a call. Rather than calibrate the entire gauge, you could j=
ust find out what one gauge reads @ the tire pressure you use & calibrat=
e any other ones to that gauge. <div><br></div><div>Peace, Pat</div><di=
v><br></div><div><div dir=3D"ltr">Pat Horne <div>We support Habitat for=
Humanity</div><div><br></div></div><div dir=3D"ltr"><br>On Apr 26, 2024, at=
5:36=E2=80=AFPM, Bob Spidell <bspidell@comcast.net> wrote:<br><br></d=
iv><div dir=3D"ltr">=EF=BB=BF
=20
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DUTF-8"=
>
=20
=20
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>
<br>
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>
<br>
<br>
<div class=3D"moz-cite-prefix">On 4/26/2024 10:26 AM,
<a class=3D"moz-txt-link-abbreviated" href=3D"mailto:alfuller194@gmail=
.com">alfuller194@gmail.com</a> wrote:<br>
</div>
<blockquote type=3D"cite" cite=3D"mid:075301da97fe$f1882610$d4987230$@gm=
ail.com">
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DUTF-=
8">
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)">
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Sorry for
the late reply =E2=80=93 I have no idea where several weeks=E2=80=
=99 worth
of messages have been hanging out!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> <=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">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=E2=80=A6<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> <=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&=
quot;Calibri",sans-serif">-----------------------------------<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&=
quot;Calibri",sans-serif">All
the best,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&=
quot;Calibri",sans-serif"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&=
quot;Calibri",sans-serif">Al
Fuller<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p> <=
/o:p></span></p>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0=
pt 0in 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-fam=
ily:"Calibri",sans-serif">From:</span></b><span style=3D"font-size=
:11.0pt;font-family:"Calibri",sans-serif">
Shop-talk <a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:sh=
op-talk-bounces@autox.team.net"><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 class=3D"moz-txt-link-rfc2396E=
" href=3D"mailto:bjzwissler@gmail.com";><bjzwissler@gmail.com></a><br>
<b>Cc:</b> <a class=3D"moz-txt-link-abbreviated" href=3D"mailt=
o:Shop-talk@autox.team.net">Shop-talk@autox.team.net</a><br>
<b>Subject:</b> Re: [Shop-talk] Tire Gauges<o:p></o:p></span><=
/p>
</div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<div>
<p class=3D"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.<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class=3D"MsoNormal">It's low cost, but not very practical.&nb=
sp;
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.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class=3D"MsoNormal">If you had some mercury, a 5 foot
column should do the trick. Don't tell the EPD, though.<=
o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><o:p> <=
/o:p></p>
<div>
<div>
<p class=3D"MsoNormal">On Sun, Apr 7, 2024, 15:37 Benjamin
Zwissler <<a href=3D"mailto:bjzwissler@gmail.com"; moz-do-=
not-send=3D"true" class=3D"moz-txt-link-freetext">bjzwissler@gmail.com</a>&g=
t;
wrote:<o:p></o:p></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt=
;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class=3D"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 partl=
y
because I don't like it when she's telling me a week
later that she's getting low pressure lights again. =
;<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I don't know how to create an
inexpensive standard for calibration. The M=
ilton
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. <o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Any ideas on creating a low
cost pressure standard for calibration?<o:p></o:p></p>=
</div>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Ben <o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><o:p=
> </o:p></p>
<div>
<div>
<p class=3D"MsoNormal">On Sun, Apr 7, 2024, 1:49<span s=
tyle=3D"font-family:"Arial",sans-serif">=E2=80=AF</span>PM Jeff
Scarbrough <<a href=3D"mailto:fishplate@gmail.com=
" target=3D"_blank" moz-do-not-send=3D"true" class=3D"moz-txt-link-freetext"=
>fishplate@gmail.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCC=
CC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class=3D"MsoNormal">So, I have three tire
gauges: Accutire electronic, Jayco
mechanical, and Milton Inflator hose with
gauge. All three report consistently, and&nb=
sp;all
three are 3-4 psi different - low to high in
the above order.<br>
<br>
Is there a simple way to check accuracy? &nbs=
p;<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> Jeff <o:=
p></o:p></p>
<br>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
=20
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