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  • level troubles

    yea i know, the first mistake was buying this machine level from grizzly. armed with a granite slab i checked it for error. yep i was off. so now i am trying to correct that. so now i have a level i dont trust even when i do , IF in fact, i get the error out of it. only armed with the granite slab again from grizzly how in the heck am i to know that when the bubble is centered that it is level?

  • #2
    Simple,turn the level end for end,if you get one reading as being level when you turn the level end for end you should get the exact same reading,or am I missing something?
    I just need one more tool,just one!

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    • #3
      ok but what can i do to ensure that the bubble shows level and the body of the level is also level. is there another method to use other than finding a certified level surface, say.... at a machine shop. yea i know how to check to see if it has error but i dont know how to guarantee that its actually level.

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      • #4
        That's what a level does, as Weird pretty much points out.
        If the bubble reads dead center on a flat surface, no matter which way you turn the level, that surface IS level. If it reads slightly to one side when you turn it either way (reads exactly the same off level) your level is good, but your surface is off level by the amount shown. Guaranteed.
        Location: North Central Texas

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        • #5
          If there is an adjustment for the bubble, follow the procedure of turning it end for end, and adjust until the bubble reads centered within the lines either way. If this cannot be achieved, the surface you're truing it on isn't level, so you'll have to adjust that. When you can center the bubble the same when you turn end for end, the level is adjusted, and the surface you're truing it on is level, as well.

          [This message has been edited by darryl (edited 10-25-2003).]
          I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-

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          • #6
            Darryl,

            The surface might not be exactly perpendicular to the local gravitational normal. If the level reads the same, not necessarily centered between the lines, but the same when reversed, then it is correct.
            --------------
            Midstream editosis strikes again, eh?

            [This message has been edited by Evan (edited 10-25-2003).]
            Free software for calculating bolt circles and similar: Click Here

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            • #7
              What Darryl is describing is a method to adjust level and surface simultaneously, and is correct. If you use a relatively level surface, and just turn the level, you will pretty well zero the level to your best ability to estimate and duplicate the error in reading in each direction. If you adjust both until there is no movement in the bubble, the level is zeroed out.
              It works much like centering something in a 4 jaw with a wiggler. When done, both are dead on.
              Jim H.

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              • #8
                There was a posting on another forum about Grizzly levels.

                That guy found that the bottom of his was concave, and sat on only three out of four of the corners when put on a granite flat.

                He sent it back, they credited him and paid shipping, if I recall correctly.

                My advice would be to send it back and get credit, and then buy a real one.

                They might have sold you the one he returned.....

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                • #9
                  Levels are self-checking. All you need to calibrate a level is a flat stable surface that's approximately level. The surface may have a slight slope but at 90 degrees to the slope and in plane with the surface will be a line which is level. You can find the line by checking with the level, rotating it while looking for a consistant reversal error. Then you can fix the line by laying a heavy parallel on the surface.

                  Procede with the calibration with a glad heart. A precision level can be calibrated in an open shop to as great a degree of precision as one calibrated in a controlled cal lab. Just be sure that handling the level doesn't affect the calibration by injection of body heat.

                  As for cheap levels whose reference face may be out of flat, you're a machinist, aren't you? Get out the blue, the granite flat, a slip stone, and a scraper and make it flat.

                  [This message has been edited by Forrest Addy (edited 10-25-2003).]

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                  • #10
                    Midstream editosis, I sure hope there's a cure for that. Anyway, you're right, Evan, just turning the level and seeing the bubble offset the same ammount, in the same direction, says that the level is accurate. The surface you test it on doesn't have to be level.
                    Out of the blue, I got a phone call from a guy who wanted to get rid of some 'junk' that had been left hanging around his barn. Lots of these things were tools, one of which was a level. This one had an adjustable bubble with a pointer which indicated over a range of + or - 5 degrees. He wouldn't part with it.
                    Now for a little poststream edit, re the gravitational norm. Is that why some rivers can flow two directions at once?

                    [This message has been edited by darryl (edited 10-25-2003).]
                    I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-

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                    • #11
                      thank you guys your info has relieved a lot of frustration. now on to my 12x36 atlas with a little more confidence

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                      • #12
                        Midstream editosis,penicillin I think
                        I just need one more tool,just one!

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                        • #13
                          Gravitational normal doesn't always point to the center of the earth. It depends on what masses are nearby, like, say, Mt. Everest. Seriously, they look for ore bodies with gravitometers towed behind a plane so the gravity of the plane doesn't affect it so much.
                          Free software for calculating bolt circles and similar: Click Here

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                          • #14
                            Now I'm thinking again (dangerous?) Isn't there a road somewhere that slants just a bit, and the gravitational norm is off, so a car can actually roll uphill on it- I bet they didn't use a level to see if it's uphill or not. What device would one use to check the absolute 'levelness', where gravity can't be used, a gyrolevel?
                            I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-

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                            • #15
                              Gravity is as gravity does. That is the only "level" there is.
                              Free software for calculating bolt circles and similar: Click Here

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