Adjusting pins

Never, Always Been In The Instrument Case

Paul in PA

I gave it up a few years ago.;-)

In the instrument case. There is an allen wrench on a string next to the pole adjusting jig in the office hallway.

I thought this was a thread about .....

Kent moving monuments to match record again.

Old leather snap case with three pins and a very small screwdriver, embossed "Nikon" in my front desk drawer. Along with my round hard plastic culvert sizing 'calculator'.

Oh, and there's a very old round container of Staedtler 6H lead for a lead holder in there too...why, I don't know...

All the specialty tools are in my desk drawer along with grandmother's hat pins that also come in handy.

The larger or jumbo size paper clips work in a snap.

We just pullem and putem where we wantem

Back when I was a young impressionable LSIT, I worked with a Party Chief that would adjust Pins with a 6lb sledge hammer. One day we were surveying a city block, 300' X 300'. We found pins on one side that were about 299.0 feet apart. The PC used his plumb bob to make a hole about 0.9 feet away from the pin, in the direction of the other corner, then proceeded to whack the offending pin with a 6 lb sledge until it was 1 foot for the plum bob hole. He then setup the transit over that point, backsited the previous corner and turned a 90. We put a pin flag behind that pin and moved to the other end and did the same thing, but this time I did not have to walk back there with my plumb bob to give a backsite, we had the pin flag to site.

Now if you are talking about adjusting instruments, we do keep some adjusting pins in the case for our Wild T-3. That is the only instrument that we adjust in-house, except for level bubbles.

About 2 weeks ago, we spent 4 hours checking tribrachs and our fixed hieght GPS tripods. All 8 tribrachs that we checked were in good adjustment. All 4 of our GPS tripods had a bubble that was out a little, but the most change that we made in any of them was 3mm. We have been using them since 1996 and this is the first time we have had to adjust them. We have PVC cases for them and that seems to have done a good job of protecting them.

> Back when I was a young impressionable LSIT, I worked with a Party Chief that would adjust Pins with a 6lb sledge hammer. One day we were surveying a city block, 300' X 300'. We found pins on one side that were about 299.0 feet apart. The PC used his plumb bob to make a hole about 0.9 feet away from the pin, in the direction of the other corner, then proceeded to whack the offending pin with a 6 lb sledge until it was 1 foot for the plum bob hole.

I knew a guy who called that "percussive maintenance".:excruciating:

> ... We have been using them since 1996 and this is the first time we have had to adjust them. ...
That's the key. They are old. New cheap chinese ones won't hold adjustment so well.