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The grinding disk rotates thanks to blue motor. Yellow motor makes pink crankshaft rotate. The crank shaft controls the advancing motion of the bandsaw via green pushing rod. The cam that fixed to the crankshaft controls the up-down motion of the grinding disk via yellow follower and blue vertical rod. The weight of the blue motor block ensures the contact between the cam and red roller. Violet plate is forced to the bandsaw by two green springs in order to keep the bandsaw immobile when the green pushing rod moves back. This video was made based on: STEP files of this video: Inventor files of this video:
