[Shop-talk] Tire Gauges

[Jeff Scarbrough]

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> 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> 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 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…
>
>
>
> -----------------------------------
>
> All the best,
>
>
>
> Al Fuller
>
>
>
> *From:* Shop-talk <shop-talk-bounces at autox.team.net>
> <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> <bjzwissler at gmail.com>
> *Cc:* 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> 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> 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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