Has anyone on here ever used those little prisms that slide up and down the pin pole? I just got done a job where I had to climb all kinds of formwork and put wall line and column line marks everywhere. I work as a 1-man crew, so it was all done robotically.
It was a real pain doing it with the rod. I used a mini rod that's about 0.4' tall, but that was too short in places where the formwork covered line of site. I see they make 360å¡ sliders as well for robotic surveying. (I guess they're at either 0mm or some positive offset, so I'd have to be careful to change that).
Dan Patterson, post: 381812, member: 1179 wrote: Has anyone on here ever used those little prisms that slide up and down the pin pole? I just got done a job where I had to climb all kinds of formwork and put wall line and column line marks everywhere. I work as a 1-man crew, so it was all done robotically.
It was a real pain doing it with the rod. I used a mini rod that's about 0.4' tall, but that was too short in places where the formwork covered line of site. I see they make 360å¡ sliders as well for robotic surveying. (I guess they're at either 0mm or some positive offset, so I'd have to be careful to change that).
Yes I use to use them all the time. Sighting in between rebar was a particular requirement.
Never seen a 360 slider. Or maybe I have but the type with many separate prisms topcon or trimble style.
We use a two prism rod for inaccessible locations. Works great. The DC stores the data (angles and distance) as if it was observed to the tip of the rod.
I have a mini pole with three sections that has the sliding prism.
It is very good when a slim, skinny, 3/8" width pole is needed for close stakeout.
Do not use it very much because it can only be used at 0mm prism offset.
All my other targets are setup -30mm prism offset.
Mostly use the pole only for stakeout in prismless mode.
:gammon:
A Harris, post: 381835, member: 81 wrote:
Mostly use the pole only for stakeout in prismless mode.
:gammon:
I don't think I have ever used the pole to measure the distance in prismless mode. Do you account for half the thickness of the rod? Is it negligible?
I take many shots in the SDA mode and then give a go or come amount to be in the center of the object, be it post, xtie, prism pole, rebar, power pole, etc. The method also allows for a right or left offset amount.
Wrap with prismatic reflective tape will increase the measuring range considerably and any setting will work, prism, target or prismless. That allows you to make a constant setting in your gun.
The sliding pole I have is 0.03ft thick and has three 2ft sections with a ring on top.
Taller and thicker and easier to shoot than a chaining pin.
Wish I had extra points for the other two sections. It is possible to adapt a plumb bob point up a size or two (gonna work on that fix).
The point are similar to that of a target arrow and would be better suited in being a plumb bob point.
I take my shot and when the DC says go 0.015 I know it is spot on.
:gammon:
I use Sokkia Robots and they have a sliding prism pole which I use for setting out. Looks like the link below. Very useful to shoot between rebars and things that block.
sireath, post: 381863, member: 9370 wrote: I use Sokkia Robots and they have a sliding prism pole which I use for setting out. Looks like the link below. Very useful to shoot between rebars and things that block.
Looks pretty cool, but that says -7mm offset. I don't understand how it can have a negative offset and be a slider. Wouldn't the node be inside/behind the pin pole if that were the case? Am I misinterpreting what the offset represents?
Dan Patterson, post: 381870, member: 1179 wrote: Looks pretty cool, but that says -7mm offset. I don't understand how it can have a negative offset and be a slider. Wouldn't the node be inside/behind the pin pole if that were the case? Am I misinterpreting what the offset represents?
It's all about the optical center not the physical center of the prism.