Dissection of a Drill Bit

Today is anatomy lesson !
 A Roller Bit like you’ve never seen
dissection-dun-tricone
 
A rock bit and its bearings, seen from the inside

This bearing are standard ball bearings.
Each cone is placed on a journal at the end of the arm. A duct opening on the outside face of the arm allows the insetion of balls and the lubrification thereof.
The channel is then capped to keep the balls in place.

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