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4. Check for mica depth. If necessary, undercut the mica with a hacksaw blade to achieve proper depth. If the NO-GOOD GOOD MICA DEPTH Commutator Mica Depth Standard (NEW) 0.5-0.8 mm (0.020-0.031 in) Service Limit 0.20 mm (0.008 in) 5. Check for continuity between the segments of the COMMUTATOR SEGMENT 6. Place the armature on an armature tester. Hold a attracted to the core or vibrates while the core is ARMATURE TESTER HACKSAW BLADE ARMATURE 7. With an ohmmeter, check that no continuity exists between the commutator and armature coil core, SHAFT COIL CORE COMMUTATOR HIGH Main Menu Table of Contents |