I was walking to/from the nearby Target store, where there is construction started on the outlot, and noticed this 4x4" post with pipe fittings holding what must be a long 5/8-11 bolt.?ÿ Nice method for setting a reference for machine control.
The odd thing is that I don't see what sets the height - do they screw the antenna on until it doesn't go any further??ÿ I would want a pair of thread sealed jam nuts to set the ARP.
I would want a pair of thread sealed jam nuts to set the ARP.
So would I. But this is just for earthworks. It's good enough.
Even if it wasn't just for earthworks it would still be good enough. Just screw the antenna on gently until it stops - it is always going to be within a couple of mm.
(And do the legs on your base receiver tripod never sink slightly into the ground whilst it runs all day?)
Very standard practice. I worked with clients that set big posts with stud bolts imbedded in the middle. They had quick release mounts that they screwed on till refusal. Worked great. This picture looks flimsy compared to the ones I worked with but this isn't a permanent type location. Nothing you do with RTK GPS is going to be super vertically accurate.?ÿ
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I have seen them use a 5/8x11 bolt welded to the top of a 6' T-post. And of course there is an F-350 with a 6" lift kit on parked on the south side with the hood up to power the base.