Rack and Pinion?

A Rack is a Linear-Gear. The Rack can drive, or be driven by, a Pinion. The Rack has a linear motion and the Pinion has a angular motion. The linear motion of the rack is directly related to the radius (Pitch Circle Radius) of the Pinion.

You can convert a Rack and Pinion to a Ball-Screw in the Rack-Pinion dialog-box.

The preparation for the Ball-Screw is the same as for the Rack and Pinion. You do Add Rack-Pinion. Then, use the Rack-Pinion dialog-box to change the Rack-Pinion to a Ball-Screw.

Add Rack-Pinion / Ball-Screw

Add Rack-Pinion Ball-Screw icon

Machine Elements Toolbar : Add Rack-Pinion (Ball-Screw)

Menu :

Add menu > Mechanism sub-menu > Add Rack-Pinion (Ball-Screw)

Rack-Pinion dialog-box :

Edit the number-of-teeth on the Pinion and along the Rack, and to move the position of the rack along its axis.

You can edit the Gear Module plus other gearing parameters.

You can also convert the Rack-Pinion to a Ball-Screw.

Preparation of Basic Rack and Pinion Models

Driving Pinion - Driven Rack

GA-AddRackPinion10

Driving Pinion + Driven Rack.

LineRed-14-1b in a Green Part, a rotating-Part - it will become the Driving Pinion.
LineRed-14-2 in a Blue Part, a sliding-Part - it will become the Driven Rack.

Rule : LineRed-14-1b : radiates from the Pin-Joint.

Rule : LineRed-14-2 : in the Slide-Joint or parallel (//) to the Slide-Joint.

Lines or CAD-Lines


Add Rack-Pinion: command

1.Click Add menu > Mechanism sub-menu > Add Rack-Pinion / Ball-Screw

- or -

1.Click Machine element toolbar > Add Rack-Pinion / Ball-Screw

The Command-Manager now has two selection-boxes. You must select the two Line elements:

2.Click the LineRed-14-1b
3.Click the LineRed-14-2
4.Click OK-tiny-11-15 in the Command-Manager

The Rack-Pinion is in the Assembly-Tree and Graphic-Area.


Notes:

The Rack is offset by the Pitch-Circle Radius of the Pinion.

The Rack is on the near-side or far-side of the Pinion relative to the Slide-Joint.

The Pinion may be VERY small.

Use the Rack-Pinion dialog-box to edit the:

the number-of-teeth and module of Gears
move the Rack to other side of the Pinion.

CM-AddRackPinion-1

GA-AddRackPinion11

Driving Rack - Driven Pinion

More Rack and Pinion Models...

Driving Rack - Driven Pinion

GA-AddRackPinion00

Driving Rack > Driven Rack.

LineRed-14-1b in a Green Part a sliding-Part, and will become the Driving Rack.
LineRed-14-2 in a Blue Part, a rotating-Part, and will become the Driven Pinion.

Note:

Rule: LineRed-14-1b is a Line in the Slide-Joint or it must be parallel (//) to the Slide-Joint.

Rule: LineRed-14-2 must radiate from the Pin-Joint.

Lines or CAD-Lines


Add Rack-Pinion: command

1.Click Add menu > Mechanism sub-menu > Add Rack-Pinion / Ball-Screw

- or -

1.Click Machine element toolbar > Add Rack-Pinion / Ball-Screw

The Command-Manager now has two selection-boxes. You must select the two Line elements:

2.Click the LineRed-14-1b - in the Green sliding-Part.
3.Click the LineRed-14-2 in the Blue rotating-Part.
4.Click OK-tiny-11-15 in the Command-Manager

The Rack-Pinion is in the Assembly-Tree and Graphic-Area.


Notes:

Use the Rack-Pinion dialog-box to edit the:

the number-of-teeth and module of Gears
move the Rack to other side of the Pinion.

GA-AddRackPinion01

GA-AddRackPinion02

Videos of Rack-Pinion with Driving Pinion:

How to...

Add a Rack and Pinion with a Driving Pinion

 

Tutorials and Reference Help Files for MechDesigner and MotionDesigner 14.2 + © Machine, Cam, Mechanism, and Motion Design Software by PSMotion Ltd