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Trackability of Seco (6405-12) Nodal Point Mini Prism by Leica Robotics Total Station  

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amdomag
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I am considering to buy a handy mini prism for stakeout work. What I have in mind is the Seco (6405-12) Nodal Point but not sure of its trackability when used with a Leica robot. Any experience? Thank you.

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Sergeant Schultz
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When I got my first robot, I felt that I wouldn't need to spend the money for a 360° glass.  Well, it's just about impossible to keep a single retroreflector pointed constantly at the instrument.  Turn away even for a few seconds, and lock is lost and time is wasted reorienting the target and waiting for the instrument to reacquire the target. 

I have a couple of mini prisms similar to the Seco (6405-12), but prefer one like this: New  360 degree Mini Prism  for Surveying  Total Stations for stakeout.  Fairly close tolerances can be met by using care in orienting the prism.

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amdomag
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@sergeant-schultz

Is this a seco glass?

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party chef
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Using single prism with tracking is a pain and your precision will suffer.

I would rather spend it on gear than on wages for some poor guy struggling to get the job done with the wrong equipment.

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amdomag
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Any experience of the trackability of Seco 360 deg. prism (6401-00-YEL)? As it is a Seco product, I would think it is of good quality and cheaper than Leica 360 deg prism as well. The prism design as an array/assembly of 6 individual glasses provides a feeling that there would be dead spot(s) around the prism.

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Jim Frame
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Posted by: @party-chef

Using single prism with tracking is a pain and your precision will suffer.

I don't understand why you think precision will suffer.  I use a miniprism exclusively with my robot, and don't have any precision (or accuracy!) problems.

 

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amdomag
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@jim-frame

Are you using standard or 360deg mini prism?

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party chef
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@jim-frame

If I recall correctly you use Leica -17.5 mini prisms, when you use standard mini prisms robotically the error from pointing of the prism creeps up pretty quickly.

Are you working alone without a 360 prism? I thought you were the user that touted the higher precision lighter weight 360 Leica glass.

True precision aside I have found that working alone with tracking to a standard, moving prism to be an awkward proposition leading to second best results. That loss is what I was trying to speak to, more than say genuine centering error.

 

 

 

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