Leica Tribrach Optical Plummet Adjustment

The Leicas I have adjusted have a screw on each side and top and bottom if I remember right. You loosen one and tighten the opposite like on an old four footscrew transit.

If that isn't working for you then maybe one or more screws are broken or stripped. The newer tribrachs come with tiny little screws which are really cheap and weak.

Are all the screws necessarily tight when calibration is achieved?

> Are all the screws necessarily tight when calibration is achieved?

I think "snug" is a better term than "tight" in this context. You're dealing with finger-tip pressures rather than the fist-and-wrist variety. The screws want to be turned enough to take out the lash and resist loosening under normal vibration, but you don't want to flirt with the yield point of the material.

You have to make sure that when you tighten one screw, you loosen the opposite one. It took me a little tinkering before I caught on to the pattern. Having said that, I don't have any Lieca tribrachs, but I would think that the principles are close to being the same.

> You have to make sure that when you tighten one screw, you loosen the opposite one.

I think the reverse procedure is preferable: loosen one, then tighten the opposite. Otherwise, you risk stripping the screw in an effort to move the crosshair.

FWIW, Leica switched manufacturers and design on their tribrachs in about 2005 +/-? . Before that their tribrachs were made in Austria. Newer ones are made in Czechoslovakia/Czech Republic. The Austrian ones were of much better quality. The two have distinctly different adjustment appuratus.

We have a post-2005 TCRP1203+ with a tribrach (no O.P.) labeled "Made in Hungary."

The S6 has an even cheaper looking tribrach on it, though.

Jim,

You are CORRECT! Thanks for that. I would hate for someone to mess up a good tribrach.

Jimmy

I may have confused my eastern European countries.

Amdomag,
Are you trying to tell us the image is inverted ?

I think you should get points for at least spelling Checko.. Czheko..
That country adjacent Yugoslavia, correctly.

White paper from Leica about their tribrachs.

http://www.leica-geosystems.com/downloads123/zz/accessory/accessories/white-tech-paper/White%20Paper%20Tribrachs_en.pdf

But no adjusting instructions.

Back Off Upper/Lower A Hair, Before Adjusting Left/Right

To allow reticle to slide.

Then loosen one side before tightening other side.

Same but different to adjust upper/lower.

Once it is adjusted, snug up all around.

Paul in PA

Thank you guys!

I just finally figured it out, of course with your help.

🙂 🙂

Where are the screws on your tribrach located? I have a Wild GDF22, and there only seems to be two screws on the right side of the eye piece. Nothing on the top, bottom or left. I was wondering what the procedure is for the GDF22.

Old thread dreadge I know but I have the same question about the gdf22, bubble all good but need to adjust where the eye piece points and can't see the four screws around the eye piece that stand out on the sokkia ones I've sorted?

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A image would be fantastic!

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@lukenz

Sometimes there are screws underneath a threaded cover that you have to unscrew.?ÿ Sometimes they're flat head screws, sometimes hex.?ÿ Sometimes there are 2 screws, both on the right side.?ÿ Sometimes 4 screws on opposite sides.

Attach a picture of yours

@jph

Put a call though to dealers service centre and they were super helpful. On the right side of the plummet when looking at it are two screws that adjust the pointing of the plummet.

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Also the reticle was loose in the plummet which required screwing footscrews right up, removing plummet with the three screws in the top where instrument/targets sit and tightening a very fine screw under the focus adjust.

Yup, you found the screws.?ÿ Good deal