Figure 4-5. Scorsby Base

TM 1-1500-204-23-4 WARNING Drycleaning solvent is flammable and solvent vapors are toxic. Use P-D-680, Type II Solvent in a well- ventilated area. Keep away from open flames. Avoid prolonged solvent contact with skin. (2) Cleaning. Clean turntable assembly periodically with cloth dampened in drycleaning solvent, Federal Specification P-D-680, Type II, and wipe dry with a clean cloth. (3) Operating procedures. Refer to TM 55- 4920-377-1 3&P for tester operating procedures. (4) Safety practices. The following general safety practices shall be observed: · Do not use any other electrical power except 115 vac at 60 Hz. Other frequencies will alter the operation of the turntable. · Do not over tighten gear clutch when making adjustments. (5) Maintenance. The following maintenance procedures are for turntable instrument testers: (a) Using 1 drop of lubricating oil, MIL-L-8383, periodically lubricate sleeve bearings. (b) Lubricate worm and worm wheel gear teeth with grease, MIL-G-23827. (c) Lubricate gear shaft collar with grease, MIL-G-23827. d. Scorsby Base. The Scorsby base, as shown in figure 4-5, is used as a primary test apparatus for testing gyroscopic instruments. (1) Inspection. Inspect the Scorsby base using the following procedures: (a) Inspect fan belt once a month for wear and looseness. Replace fan belt if worn or loose. (b) Inspect motor for smooth operation. Replace motors that do not operate smoothly. WARNING Drycleaning solvent is flammable and solvent vapors are toxic. Use P-D-680, Type II Solvent in a well- ventilated area. Keep away from open flames. Avoid prolonged solvent contact with skin. Figure 4-5. Scorsby Base 4-6