Mechanism | Add Bevel Gear-Pair

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Mechanism | Add Bevel Gear-Pair

Add Bevel Gear-Pair

See also: Gear-Pair dialog-box

What is a Bevel Gear-Pair?

A Bevel Gear-Pair is two Gears that rotate in mesh, with each gear on a different Plane. with intersecting rotational-axes.

Gear-1 is the Driving-Gear. Its motion is defined before you add the Bevel Gear-Pair.

The motion of Gear-2 is a function of the gear ratio and the mesh.

The gears may have an external or an internal mesh.

Add Bevel Gear-Pair command

We use the same command to add a Bevel Gear-Pair. as we use to add a Gear-Pair

R13 -Icon Add Gear-Pair

Machine Elements Toolbar : Add Gear-Pair

Menu :

Add menu > Mechanism sub-menu > Add Gear-Pair

Edit Gear-Pair :

Gear-Pair dialog-box

Prepare Bevel Gear-Pair

The preparation to add a Bevel Gear-Pair is more complex than Add Gear-Pair.

A Bevel Gear-Pair relates three Lines in three Parts.

Two Parts are in one Mechanism-Editor. The third Part is in a different Mechanism-Editor.

The Mechanism-Planes of the two Mechanism-Editors must intersect. They are typically, but not necessarily, 'orthogonal'.

Lines or CAD-Lines.


Green Part-Outline - kinematically-defined Part - Solved-Part - are terms for a Part that has its motion already defined.

Blue Part-Outline - kinematically-undefined Part - Free-Part - are terms for a Part that does not have its motion defined.


Preparation 1: Add a Rotating Part

A Pin-JointRed-14-2 joins a Point in LineRed-14-1 to a Point in LineRed-14-3 in a different Part - usually the Base-Part. The two Parts have Green Part-Outlines

LineRed-14-3 : add a dimension to define its length, with the Part-Editor.

Note: It is not necessary that the motion of the rotating-Part is defined with a Motion-Dimension FB.

See Globe-www Tutorial 1: Add a Rotating-Part.

Add Plane dialog

Add Plane dialog

Preparation 2: Add a Plane to the Line in the Base-Part

1.Click Model menu (or toolbar) > Add Plane

2.Click the LineRed-14-3 in the Base-Part

In the Add Plane dialog:

1.Click the Move Plane to end-Point check-box

2.Enter 90º in the Rotate around the Z-axis

3.Enter 90º (default value) is in Rotate around the x-axis.

Plane to a Line

The new Plane
Notice the Blue and Red Arrowheads


Preparation 3: Add a Mechanism-Editor to the new Plane

1.Click Model toolbar >Add Mechanism-Editor

2.Click the new PlaneRed-14-4

You jump to the new Mechanism-Editor

1.Click Visibility toolbar> Show other Kinematic and Sketch-Elements

2.Also, edit the Mechanism name-tab to edit the light-bulb with Show with other Kinematic and Sketch-Elements

3.Spin the model to show the Part-Outlines and the sketch-elements in the two Mechanism-Editors


Preparation 4: Add a new Part and Pin-Joint

1.Click Kinematic elements toolbar > Add Part | Drag to add the Part

2.Click Kinematic elements toolbar > Add Pin-Joint

a.Click the Origin of the new Part

b.Click the Point at the end of the Line in the 'other Mechanism'

The Part will jump to a new place, that I cannot predict! Do not be concerned to where the Part moves. It has a Blue Part-Outline.

3.Click the original Mechanism-Editor

See also: Geared-Rocker, Dyads and Kinematics-Tree

Add Bevel Gear-Pair command

Do the Preparation - see above.

Make sure the active Mechanism-Editor includes the rotating-Part with the Green Part-Outline

Make sure to do: Visibility toolbar > Show other Kinematic and Sketch-Elements, (for Global Settings


STEP 1: Click Machine elements toolbar > Add Gear Pair


The Command-Manager instruction is:

Add Gears: Driving Gear is Green Part; Driven-Gear is Blue Part. Parts joined to Green Line with Pin-Joints.

The four elements to click to add the Bevel Gear-Pair:

Red-14-1 The Line along the center of the rotating-Part with the Green Part-Outline

Red-14-2 The Line along the center of the Part in the 'other Mechanism'

Red-14-3 The Line in Base-Part

Red-14-4 The dimension of LineRed-14-3



Refer to the hints in the Command-Manager and elements 1 - 4  in the image above:

STEP 2: Click the Green Line on Gear Part 1

The CAD-LineRed-14-1 along the kinematically-defined Part. This Part has a Green Part-Outline.

STEP 3: Click the Blue Line on Gear Part 2  

The CAD-LineRed-14-2 in the Part in the other Mechanism-Editor. It is not yet a kinematically-defined Part. This Part has a Blue Part-Outline.

STEP 4: Click the Green Line joining Gear centers

The LineRed-14-3 is in the Base-Part to which Gear Part 1 is joined with a Pin-Joint. The Base-Part has a Green Part-Outline


The Part-Editor opens to show LineRed-14-3 and its dimensionRed-14-4.

STEP 5: Click the center Distance Dimension Red-14-4

Click the arrowhead, or the dimension lineRed-14-4.

The command will not complete if you click the LineRed-14-3 or the Dimension-Value.



STEP 6: Click OK-tiny-11-15 in the Command-Manager  

The distance between the Gear-centers is a function of the number-of-teeth, module and mesh of the gears.

The default Bevel Gear-Pair elements have an external mesh.

All the Parts are now kinematically-defined Parts.

Gear Part 2 is now identified in the Kinematics-Tree as a Geared-Rocker

See Gear-Pair dialog-box to edit the gear parameters