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Old 06-04-2012, 04:34 PM   #1
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Shooting grade


I know my benchmark, I shoot the benchmark to get the machine height. Do I add or subtract the benchmark to get my magic number?

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Old 06-04-2012, 05:17 PM   #2
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Shooting grade


Going down= you add
Going up = you subtract.

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Old 06-04-2012, 06:03 PM   #3
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Shooting grade


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Originally Posted by JG Civil View Post
I know my benchmark, I shoot the benchmark to get the machine height. Do I add or subtract the benchmark to get my magic number?
what magic number are you looking for?

you add you backsight reading (rod set on benchmark) to the benchmark elevation to determine your height of instrument.

for example, if your benchmark is elevation 100.00 and you read 4.75 on the rod your height of instrument is 104.75. (100.00 + 4.75 = 104.75)

to set a grade mark for an elevation of 103.00 you would move your rod up or down until you read 1.75 on the rod. (104.75 (HI) - 1.75 = 103.00)

hope this helps
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