Tripod/Total Staion setup procedures

bill93 · 2015-05-19T00:28:00Z

Today I watched an archaeology class learn how to use a total station. It was painful to watch. Some quotes: "I can't see any white triangle." "What do you mean, crosshairs?" "Uh, maybe you should lock the motions before using the fine adjust knobs." I was also a little nervous that they let it get set up with about 18 inches between tripod legs. It looked like a stiff wind could blow it over, but the assistant in charge didn't comment.What really got me was that I think it took 10 minutes to set up over a point. The procedure was to put a cap on the tripod, that centered the 5/8" screw, hang a plumb bob, readjust the length of its string, fiddle with the legs until it was close, check the level of the tripod head, repeat for a while, put the TS on and find that it wasn't close enough, and start over.The professor won't let them change the length of a tripod leg after mounting the total station. Since the optical plummet is in their total station and not the tribrach, that prevents the procedure I always use (Wolf & Ghilani 8.5).Using that, you get in the ballpark, use the tribrach screws to point at the ground mark, adjust the tripod legs to nearly level the tribrach, and you are probably close enough to slide the tribrach into position. I do cheat and leave the instrument on the tribrach while making small adjustments to one leg at a time, and W&G say you shouldn't.----So the question is: Do you or do you let your crews adjust the length of one tripod leg at a time with the instrument in place?

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Thomas Smith

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Of course! Doing larger boundaries, I sometimes set up 50 to 60 times a day. Doing it otherwise is just counter productine

Posted : May 20, 2015 6:16 pm

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Tripod/Total Staion setup procedures

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