[Shop-talk] Tire Gauges

Sat Apr 27 15:39:14 MDT 2024

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.

https://boisecal.com/

Brian
Nampa, ID

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From: Shop-talk <shop-talk-bounces at autox.team.net> on behalf of Jeff Scarbrough <fishplate at gmail.com>
Sent: Saturday, April 27, 2024 2:37 PM
To: Pat Horne <patintexas at icloud.com>
Cc: Shop-talk at autox.team.net <Shop-talk at autox.team.net>
Subject: Re: [Shop-talk] Tire Gauges

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.

I might just do the rounds of TPMS gauges to see which one most matches those and calibrate everything else to that one.

Thanks for everyone's suggestions!

On Fri, Apr 26, 2024 at 10:29 PM Pat Horne <patintexas at icloud.com<mailto:patintexas at icloud.com>> wrote:
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.

Peace, Pat

Pat Horne
We support Habitat for Humanity

On Apr 26, 2024, at 5:36 PM, Bob Spidell <bspidell at comcast.net<mailto:bspidell at comcast.net>> wrote:

 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).

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.

On 4/26/2024 10:26 AM, alfuller194 at gmail.com<mailto:alfuller194 at gmail.com> wrote:

Sorry for the late reply – I have no idea where several weeks’ worth of messages have been hanging out!

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…

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All the best,

Al Fuller

From: Shop-talk <shop-talk-bounces at autox.team.net><mailto:shop-talk-bounces at autox.team.net> On Behalf Of Jeff Scarbrough
Sent: Sunday, April 7, 2024 1:13 PM
To: Benjamin Zwissler <bjzwissler at gmail.com><mailto:bjzwissler at gmail.com>
Cc: Shop-talk at autox.team.net<mailto:Shop-talk at autox.team.net>
Subject: Re: [Shop-talk] Tire Gauges

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.

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.

If you had some mercury, a 5 foot column should do the trick.  Don't tell the EPD, though.

On Sun, Apr 7, 2024, 15:37 Benjamin Zwissler <bjzwissler at gmail.com<mailto:bjzwissler at gmail.com>> wrote:

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.

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.

Any ideas on creating a low cost pressure standard for calibration?

Ben

On Sun, Apr 7, 2024, 1:49 PM Jeff Scarbrough <fishplate at gmail.com<mailto:fishplate at gmail.com>> wrote:

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.

Is there a simple way to check accuracy?

    Jeff

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