Rack and Pinion / Ball-Screw
See also Rack-Pinion dialog-box
A Rack is a Linear-Gear that engages with a Pinion, which is a Circular-Gear.
The Rack-Pinion pair converts linear to angular motion, or rotary to linear motion.
A Ball-Screw (& Nut) pair is also a device that converts rotary motion of a screw to linear motion of a nut, or converts linear motion of a nut to rotary motion of the screw.
Use the Rack-Pinion dialog-box to convert a Rack-Pinion to a Ball-Screw.
Preamble:
Before you can do Add Rack-Pinion. you need a model that has a: •Part that is kinematically-defined - it is a sliding-Part or a rotating-Part. •Part that is NOT kinematically-defined - it is a rotating-Part or a sliding-Part. After you do Add Rack-Pinion, the two Parts are kinematically-defined (Green Parts). To do Add Rack-Pinion, you select a Line in the two Parts. Line 1: a child to a Green Part - the Driving-Part. The Driving-Part becomes (will be) the Pinion if it is a rotating-Part, or the Rack if it is a sliding-Part Line 2: a child to a Blue Part - the Driven-Part. The Driven-Part is a Green Part after you do Add Rack-Pinion. The Driven-Part will be the Rack if it is a sliding-Part, or the Pinion if it is a rotating-Part. |
Add Rack-Pinion / Ball-Screw
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Machine Elements toolbar : Add Rack-Pinion (Ball-Screw) |
Menu : |
Add menu > Mechanism sub-menu > Add Rack-Pinion (Ball-Screw) |
Edit Rack-Pinion : |
If required, use this dialog-box to convert the Rack-Pinion to a Ball-Screw. |
Rack and Pinion
Driving-Pinion - Driven Rack
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PREPARATION: Driving-Pinion + Driven Rack.•Line •Line Notes: The two Parts are joined to the same third Part. The third Part is the Base-Part. It is not necessary that the Slide-Joint is radial from the Pin-Joint. Add Rack-Pinion1.Click Add menu > Mechanism sub-menu > Add Rack-Pinion / Ball-Screw - or - 1.Click Machine elements toolbar > Add Rack-Pinion / Ball-Screw The Command-Manager has two selection-boxes. Select the two Line elements: 2.Click the CAD-Line 3.Click the CAD-Line 4.Click The Rack-Pinion is in the Assembly-Tree and Graphic-Area. Notes: •The Pinion may be very, very small! •The Rack is parallel to the CAD-Line in the Sliding-Part. It is offset by the Pitch-Circle Radius of the Pinion. •Use the Rack-Pinion dialog-box to edit the radius of the Pinion. e.g: edit the Module parameters, or number of teeth. •If you close the model and open it at a later time, you may need to use 'Rebuild' to regenerate the symbols for the Rack-Pinion. |
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