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Thread: Super Accurate Precision Level

  1. #1

    Join Date
    Nov 2015
    Location
    Carmel CA
    Posts
    8

    Super Accurate Precision Level

    Super Accurate Precision Level

    Ahoy, Homebuilders,

    I had need for a super accurate precision level years some ago. They exist, but are costly.
    For my needs, I took a 3/8" x 46" neon tube, plugged one end, filled it -w- mineral spirits and enough ATF to give it a bit of color, adjusted fluid for ~~ a 1" bubble, and sealed the other end.
    I took an ordinary (good condition) aluminum builder's level, and fastened the tube to it, propped up the middle ~~ 1/16" to create a parabola.
    You could pick the crater on the moon that you wanted to aim at.
    Enjoy /s/ Bob

  2. #2

    Join Date
    Nov 2011
    Location
    KDCU
    Posts
    259
    In the course of rigging my Fokker D.VII I found one of the most precise levels available was in my pocket:

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    The free phone app reads down to 0.1* and is as accurate as a high$$$ digital level I had in the shop.
    Sam Buchanan
    EAA Technical Counselor
    The RV Journal RV-6 build log
    Fokker D.VII build log

  3. #3

    Join Date
    Dec 2016
    Location
    Zionsville, Indiana
    Posts
    20
    I don't know how accurate you need a level to be.

    My back ground is in formula car racing. When we level the alignment platforms, we commonly use a transit level and a machinist scale. With the magnification of the transit level, you can set the view line on the edge scribed line for the 1/64" scale. I used this system to level my 4' x 18' building table.

    Anther very accurate level system is to use a clear plastic tube filled with water. Here the accuracy is limited by your ability to read the machinist and the water level in the tube.

    The accuracy of a digital level is not accurate enough over the width of the race cars I work on. The accuracy is frequently stated in terms of repeatability of a measurement. 0.1 degrees over 65 inches (track width of a formula car) is a big number for my work.

    I do like and use digital levels and a phone app. seems like a very handy tool.
    Last edited by lathropdad; 06-20-2017 at 08:43 AM.

  4. #4

    Join Date
    Nov 2011
    Location
    KDCU
    Posts
    259
    What I find handy about a digital level and/or the phone app is how easy it is to set flying surface incidence. Regardless of whether or not fuse longerons are perfectly level, the app can be aligned with them then set to 'zero'. The required incidence value (for example, 2.5*) can then be directly read on the digital readout. In other words, the device is reading the difference in degrees between two components. It is much more complicated to complete this operation with levels that don't have digital indicators. The accuracy of these operations still depend on the care taken by the builder and a good straight edge is also useful.
    Sam Buchanan
    EAA Technical Counselor
    The RV Journal RV-6 build log
    Fokker D.VII build log

  5. #5

    Join Date
    Dec 2016
    Location
    Zionsville, Indiana
    Posts
    20
    Quote Originally Posted by Sam Buchanan View Post
    What I find handy about a digital level and/or the phone app is how easy it is to set flying surface incidence. Regardless of whether or not fuse longerons are perfectly level, the app can be aligned with them then set to 'zero'. The required incidence value (for example, 2.5*) can then be directly read on the digital readout. In other words, the device is reading the difference in degrees between two components. It is much more complicated to complete this operation with levels that don't have digital indicators. The accuracy of these operations still depend on the care taken by the builder and a good straight edge is also useful.
    Absolutely can"t argue with handy. And I like the idea of an app. to do the job. I have a digital level, it is brilliant and way more than accurate enough for many jobs.

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