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PostPosted: Tue Dec 11, 2018 5:18 pm 
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Supercharged

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 2719
Location: Indianapolis
Car Model*:
getting set to build a new motor, to improve the robustness of the process I like to
check the torque wrenches,,,the basic formula is Torque ft lb = weight x distance inches

here is a post on one way to do that
https://www.wikihow.com/Calibrate-a-Torque-Wrench

I took my weights to the local UPS Store and
weighted them on their certified scale. I did that on a Tuesday morning
not busy time, after I mailed a couple of packages and asked the attendant who
I was working with for an OK to do that,,,

For my weight set, I had one ten pound weight that was true, others were short by
.45 to .5 lb,, 10 pounders and 2.5 weights were off by a similar ratio.

for me
250 ft lb click wrench reads 7 ft lb low at 80 lbs
150 ft lb beam wrench was maybe 1 ft lb low at 80lbs however the scale is really compressed, not a lot of resolution.
600 in lb scale wrench was 12 inch lb high at 400 inch lb
30 inch lb scale wrench was 1.25 inch lb high at 20 inch lb

so there is some variation among the wrenches
,that is why I snug fastners tight with the appropriate scale or click wrench
and then use the beam wrench for the final set.

Keep in mind that the beam wrench scale has less resolution, and one needs to be able to read the
scale-beam from a zero angle, to be accurate with poor resolution.


Attachments:
beam tq.jpg
beam tq.jpg [ 126.81 KiB | Viewed 1774 times ]
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PostPosted: Tue Dec 11, 2018 7:34 pm 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
Posts: 6106
Location: So California
Car Model*: 64 Plymouth Valiant
Usually with the click wrenches, you can adjust the dial gauge to match the torque.

Also I've played with the internal clicker in the handle...………….

You may need to decide where you want your accuracy.

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64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes
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PostPosted: Fri Dec 14, 2018 11:36 am 
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Turbo Slant 6
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Joined: Mon Jan 25, 2010 11:29 pm
Posts: 543
Location: Seattle, WA
Car Model*: 75 Dart SE (2),75 Swinger, 74 Dart Sport,91 Ram RV
Also beware that the manufacturer's quality varies wildly. Fun story: Years ago, when the calibration laboratory checked our aviation equipment, we found 3 brand new Snap On click-type torque wrenches that failed calibration and had to repaired. One of our mechanics had a snap-type TW that he bought new for $10.00. Other than the scale on it, the only other identifying word was "Taiwan". It passed calibration every time! :)

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PostPosted: Fri Dec 14, 2018 2:11 pm 
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Board Sponsor & Moderator
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 13371
Location: Blacksburg, VA
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Thanks for sharing, John. Beam type for me, and I always overtorque by 5-20 ft-lbs depending on the fastener. Probably I could just do it by feel, and I do for many things, but numerical measurement is also your friend.

My friends ask me how do I know how tight to make it. I tell them you tighten til it breaks, then back off 1/8-1/4 turn! That just means I've broken plenty of bolts over the years and almost always know where the limit is. Don't try this at home...

Lou

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PostPosted: Fri Dec 14, 2018 9:45 pm 
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Turbo Slant 6
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Joined: Wed Apr 30, 2003 6:43 pm
Posts: 867
Location: SoCal
Car Model*: Toad Wagon
One of my sillier little head games is to torque screws to feel with my eyes closed, then check the wrench. Have gotten rather decent at it over the years. :lol:

Strictly beam style for me.

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