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Most robotic arms use the following joint types:
- Prismatic or slider joints in which the link is supported on a linear slider bearing, and linearly actuated by ball screws and motors or cylinders.
- Revolute or rotary joints often driven by electric motors and chain/belt/gear transmissions, or by hydraulic cylinders and levers.
- Spherical joints, these are the third most utilized joint and just slide causing a revolving movement.
- Screw joints, these just follow the thread of the axis in spiral to move along the axis.
- Cylindrical joints, these are very rare and are use in some equipment like Parallel Robots or Flying simulator Mechanism.
With the combination of these joins, various robotic arms configuration are formed.
The complete body of the robotic arms usually is attached to some form of structural frames, for examples, machine table top or factory floor. These structural frames in many cases are not movable.
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