close-up of cogged wheels inside cracked housing of side grinder engine

gear mechanism machine damaged engine repair wheel broken tool pinion metallic box metal spare part closeup service cracked abstract detail brown blue black aluminium housing equipment macro gearwheel cogwheel cog involute cycloid curve interlock bond motion cooperation case steel aluminum component bearing quality perfect angle grinder inside mechanical engineering technology industry industrial technical background science work cogs rotate connect teeth transmission machinery gearbox round side power open educative tech artistic harmony gray nopeople