Among the various types of rotary tattoo machines available, we will focus on the direct drive machines. These machines are characterized by their utilization of a motor with a cam system.
Typically, a direct drive machine employs a DC motor that spins at high speeds, generating the necessary power to move the needle in an up-and-down motion. Attached to the motor shaft is a cam or eccentric wheel, which converts the rotational motion of the motor into linear motion. As the cam rotates, it drives the needle bar or drive bar (in the case of cartridge machines) up and down.
When it comes to the needle's interaction with the skin, it must complete a full rotation with the cam on the drive wheel, regardless of any resistance or pushback from the skin. In essence, unless there is an incorporated mechanism to introduce artificial "give," the needle's movement is solely determined by the rotation of the cam on the drive wheel. This lack of inherent flexibility highlights the importance of understanding and managing the interaction between the machine and the skin.
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