Use the torque wrench to adjust the movement of the theodolite's horizontal and vertical circles. Refer to the Hilger Watts theodolite manual for specific torque settings.
A Hilger & Watts theodolite is a masterpiece of design. By understanding the need for a thorough manual repack and regular maintenance, you can ensure that these vintage instruments remain operational for another fifty years. Proper lubrication and careful storage are the keys to preserving these important pieces of surveying history.
If your repack lacks these, it’s merely a user guide, not a true restoration tool. hilger watts theodolite manual repack
Turn the optical reading micrometers forward and backward. The internal glass scales must move smoothly without jumping, indicating the internal gear oil was applied correctly.
Avoid using modern permanent thread lockers during reassembly. The original build relied on precise mechanical tolerances and light shellac varnishes. Required Tools and Materials Use the torque wrench to adjust the movement
: You will need precision "watchmaker" screwdrivers, a rubber puffer for dust, and high-purity isopropyl alcohol ( ) for cleaning. 2. Disassembly Phases Upper Motion (Alidade)
Apply a very thin, uniform film of high-viscosity damping grease to the male spindle. Less is more; excess grease will migrate onto the internal optical paths. By understanding the need for a thorough manual
These manuals are more than just instructions; they are historical records of mid‑20th‑century surveying technology.
Begin by cleaning the theodolite thoroughly with a soft cloth to remove any dirt or debris. This ensures a smooth repacking process and prevents any contaminants from interfering with the instrument's movements.
Sight a distant, sharp target. Sight it in face-left (direct) and face-right (reverse) positions. The vertical and horizontal angles should differ by exactly 180 degrees. Any variance indicates collimation error, which must be corrected using the reticle adjusting screws behind the telescope eyepiece.
