Troubleshooting of the Condenser Lifting Mechanism of the Microscope
(1) Lifting mechanism of the condenser for straight-tube microscopes:
Race retaining ring 2. Cap screw 3. Double-nut toothed rod 4. Gear 5. Lifting handwheel 7. Binocular adjusting nut
When adjusting, hold the binocular adjusting nut on the handwheel spindle with one hand. Screw the adjusting screw into the threaded hole of the adjusting nut with the other hand and tighten it firmly to stop slipping.
(2) Lifting mechanism of the condenser for inclined-tube microscopes:
For adjustment, first back the screw between the double nuts out by 1 to 2 turns with a screwdriver. The bearing washer is pressed against the boss, so it will back off together and separate from the end face of the toothed rod. Then turn the double nuts inward with the double-nut wrench. Meanwhile, rotate the handwheel with the other hand for testing, until the lifting mechanism moves smoothly and can stay at any desired position. Stop turning the double nuts once this state is achieved. After that, screw back the positioning screw to lock the bearing washer and the toothed rod.
This adjustment works because the inner bore of the adjusting sleeve is tapered, and the tapered shaft has an axial slot. When the double nuts are screwed inward, the taper pushes the adjusting sleeve forward. The tapered bore shrinks as its opening becomes smaller, clamping the toothed rod tighter and increasing the rotational friction resistance of the gear, which stops slipping.
