Disc Grinder Restoration and Conversion - 110V to 20V by Rewinding

Disc Grinder MG-125J AC 100V 50/60Hz 8A 125 mm x 16 mm x 22 mm. 4300 m/min. Power in 780W Power out 480W MITACHI Tokyo Japan I bought this tool from Japan recycle store without testing. When I use it, it does not seem to work well, because some bearings are broken. By replacing those broken bearing, this tool will work normal. But I want it runs with battery instead. As a result, I can do it. Video sections 00:33 before restore testing 00:59 disc grinder blade removal 01:18 disc grinder disassembly 03:28 broken bolt removal 07:48 armature disassembly 10:04 commutator bar install 10:25 DC rewinding diagram 18V 10:29 DC armature rewinding 16:40 permanent magnet install 16:56 motor testing 17:26 carbon replacing 20:14 battery adapter mount 22:54 painting 24:48 battery disc grinder assembly 31:15 battery disc grinder grinding test I hope you find this video useful and enjoy it! Furthermore, I am happy to receive fe