FINDING LEVEL MACHINE FAULT

Level machine is using a lot in  site FINDING LEVEL MACHINE FAULT that's way it is very important practical if you are using the machine first time your result were wrong then you will do all procedure again .so first read this artical to finding level machine fault.  

FINDING LEVEL MACHINE FAULT

First of all open  tripod then set it on ground where you want to set level machine
then keep Level machine on tripod and tight it with plumbing fork
Now bubble the level machine from leveling screw
When bubble come to center then leave it
now you instrument is ready for work
first of all you must check machine fault
that is very essential because if you have at least (0mm- 9mm) error then it is permissible if you have more than form 9mm then you must change the instrument because it is not suitable for work
first of all how can I check machine fault
When instrument become ready then select two point
like
A and B
 keep the staff rod on A point and target it trough cross hair then keep the staff rode on point “B”  and target staff rod
now take reading on cross hair
and note both A and B reading
then change level machine to another point  . you can change to any place but only to that point from where you can see point A and B.
now bubble your instrument same like you doing for first point
then take reading on same point but you must change point name like A’ & B’ first take reading on A’ and then take reading on B ‘ through cross hair and note it
Now you have four reading and you can find easily machine fault

 first take reading on Point A

 Then take reading on Point B

 After that change the instrument to another place bubble it and select a point and take reading this will be your Point A'

And select another Point and take reading that will be your Point  B'
then calculate it on below formulas.
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 Formula FINDING LEVEL MACHINE FAULT

           A  -  A ’ = C
         B   -   B’  =D
        C    -   D = Result
if you have 1mm – 9mm then you can work on instrument
if machine fault I mean (C-D) result more than form 9mm you can’t work on this instrument
you must change it…..
9mm is premissble error

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