Topcon TL20Df tripod attachment approximately 33mm female thread. 2

[Nirrad]

Hello I am very interested in getting to know a Topcon TL20DF theodolite in order to change my Trade as a bricklayer into a setting out engineer.can anyone help me fit the instrument to the tripod it has a 33mm female thread,As always shops only want to sell you something brand new and space age.
But I am going to understand the jolly old basics 1st [COLOR=][/color]

 

[MacGyverS2000]

You need help mounting a device to a tripod? Not exactly the level of student question we're expecting around here...

Dan - Owner

http://www.Hi-TecDesigns.com

 

[drawoh]

Nirrad,

Camera tripods have 1/4[‑]20[ ]threads. UNC seems to work, but actually, they are supposed to be 1/4[‑]20BSW.

Any surveying tripod I have ever seen is 5/8[‑]11UNC. This is no where near 33mm.

A metric thread would be something like M33[×]1 or M33[×]0.7, with the second number being the thread pitch.

--
JHG

 

[Nirrad]

Thank you drawoh.
I will make something up to get me underway.
I understand it to be somewhat odd but the optical plumb to the datum is viewed through the connecting screw.
Things are laser guided on the new equipment. However,as a newcomer to a very old subject I would like to understand fully the basics of theodolite operation.

 

[IRstuff]

I understand it to be somewhat odd but the optical plumb to the datum is viewed through the connecting screw.

That's to ensure that you are directly over the monument whose datum you are planning on using. However, there are lots of other measurements for which aligning to the ground datum isn't necessary. We've used theodolites for decades, but only indoors and only for relative measurements, so we've never used anything related to datum plumb, only the autoleveling.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

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