Sturdy inexpensive support for a trailer tongue weight scale? - Page 2 - Escape Trailer Owners Community

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Old 02-22-2016, 09:09 AM   #11
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I use a roll around floor jack. Works great by sitting Sherline on the cup and jacking it up into the coupler. I put a piece of wood on the cup to make a flat for the Sherline to sit on. You can also see the effect of not having trailer level as you play with the height.

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Old 02-22-2016, 03:34 PM   #12
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I use a roll around floor jack.
In case you can't see it clearly in Carl's photo: floor jack images, as suggested by Sherline. That makes a lot of sense to me, but not everyone happens to have a floor jack.

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Remember with the Sherline you must reset between readings, you have to allow it to return to zero before adding any weight again.
Not really; there is nothing in a Sherline scale to reset, which is simply a hydraulic cylinder with a pressure gauge. It really only matters (for repeatability) that you approach the reading by increasing load. That means you can relieve some of the load and re-apply, without needing to completely remove the load.
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Old 02-22-2016, 04:02 PM   #13
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I believe you have to allow the gauge to reset itself to -0- in order to get an accurate reading. IMBW but I believe those instructions are in the manual.
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Old 02-22-2016, 04:13 PM   #14
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Quote:
Originally Posted by cpaharley2008 View Post
I believe you have to allow the gauge to reset itself to -0- in order to get an accurate reading. IMBW but I believe those instructions are in the manual.
The manual is here.

For anyone who wants to check, specifically.



http://www.sherline.com/lmbook2.pdf
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Old 02-22-2016, 04:25 PM   #15
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We have a button on our Sherline that pushes in to reset.
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Old 02-22-2016, 04:31 PM   #16
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Originally Posted by cpaharley2008 View Post
I believe you have to allow the gauge to reset itself to -0- in order to get an accurate reading. IMBW but I believe those instructions are in the manual.
Yes, that's what I've been told the manual says, but it makes no sense and conflicts with meticulous objective measurements. I assume they just put it that way because it is easy for readers to understand and ensures that the reading is taken while the load is changing in a consistent direction (increasing) which is important for repeatability. Lift the load right off if it makes you feel better, but there is no physical reason to do so.

There is nothing special about the gauge on a Sherline, other than the markings ("pounds" instead of "PSI") - that's why they say you can replace it with another one if you would like a different range. Taking the pressure to zero is not required by the gauge, or the hydraulic cylinder.
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Old 02-22-2016, 04:47 PM   #17
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We have a button on our Sherline that pushes in to reset.
A reset button on a pressure gauge would presumably just be a valve to hold the reading until it is released (tire pressure gauges often have one of these). The manual doesn't mention this button - it doesn't contain the either of the words "button" or "reset" at all, and doesn't describe any hold feature or reset action. The diagram in the manual and photos online don't show a button, either. There is a rubber plug in the gauge housing which looks a little bit like a button, but that doesn't do anything. You may have an oddball gauge - do you have a photo?
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Old 02-22-2016, 04:51 PM   #18
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My husband must think the rubber piece is a reset button. Guess not! We won't worry about it next time then.
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Old 02-22-2016, 04:52 PM   #19
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Originally Posted by cpaharley2008 View Post
I believe you have to allow the gauge to reset itself to -0- in order to get an accurate reading. IMBW but I believe those instructions are in the manual.
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Originally Posted by Losangeles View Post
The manual is here.

For anyone who wants to check, specifically.



http://www.sherline.com/lmbook2.pdf
Thanks. I've read it before, but of course don't recall every detail.

I just read and re-read the instructions in this manual (which is actually mostly about loading trailers, not operation of the gauge itself). I don't see any indication in the Instructions for Use of the Sherline Scale section (pages 10 through 12) saying anything about resetting, or completely removing load. It just says to "Raise the tongue jack until the full weight of the hitch is on the scale and read the weight in pounds directly from the gauge".
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Old 02-22-2016, 04:54 PM   #20
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We won't worry about it next time then.

Less to worry about is always a good thing!
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