Before and After: Graphics-Area & Kinematics-Tree

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Navigation:  Getting Started Tutorials - MechDesigner > Tutorial 14: Gear-Pairs / Rack-Pinions >

Before and After: Graphics-Area & Kinematics-Tree

Before and After: Graphics-Area and Kinematics-Tree

Summary

Add Gear-Pair removes one degree-of-freedom from a rotating-Part.

GRAPHICS-AREA:

Before Add Gear-Pair

Basic Preparation for Add Gear-Pair

Basic Preparation for Add Gear-Pair

Typical preparation for Add Gear-Pair

Three PartsRed-14-1bRed-14-2Red-14-3:

•two PartsRed-14-1bRed-14-2 that are kinematically-defined

•one PartRed-14-3 that is not kinematically-defined - it has one degree-of-freedom

Three Lines Red-14-4Red-14-5Red-14-6 *

•one Line in each Part Red-14-1bRed-14-2Red-14-3

Two Pin-JointsRed-14-7Red-14-8:

•Pin-JointRed-14-7 to join the start-Point of LineRed-14-5 to the start-Point of LineRed-14-4

•Pin-JointRed-14-8 to join the end-Point of LineRed-14-5 to the start-Point of LineRed-14-6

One dimension for LineRed-14-5

•Use the Part-Editor to add a dimension to control the length of LineRed-14-5.

* Lines and CAD-Lines

We use the term Line-of-Centers for LineRed-14-5.

After Add Gear-Pair

Immediately After Add Gear-Pair

Immediately After Add Gear-Pair

After Add Gear-Pair

PartRed-14-3 is kinematically-defined.

PartRed-14-3 is the Geared-Rocker in the Kinematics-Tree.

The gear-parameters and the motion of PartRed-14-1b relative to PartRed-14-2 control the motion of PartRed-14-3

Pin-JointsRed-14-7Red-14-8 are the rotational-centers of the gears.

Use the Gear-Pair dialog to edit the parameters of each gear.

KINEMATIC-TREE

Before Add Gear-Pair

BEFORE Add Gear-Pair

BEFORE
Add Gear-Pair

Before Add Gear-Pair

One Solved Kinematic-Chain and one not Solved Kinematic-Chain:

Red-14-1b GST-Icon-KT-SolvedAlways Solved Kinematic-Chain

A rotating-Part that is kinematically-defined. This example is Rocker.

Red-14-2 GST-KT-KinematicChain-Unsolved-icon-24 Unsolved Mechs (Unsolved Kinematic-Chain)

A rotating-Part that is NOT kinematically-defined

 

After Add Gear-Pair

AFTER Add Gear-Pair

AFTER
Add Gear-Pair

After Add Gear-Pair

One Solved-Kinematic-Chain:

Red-14-1b GST-Icon-KT-SolvedAlways Rocker

A rotating-Part that is kinematically-defined. A Rocker is one example.

Red-14-2 GST-Icon-KT-SolvedAlways Geared Rocker

The Geared Rocker is kinematically-defined (solved).

The Geared Rocker includes these elements:

•Pin-Joint

•Part

•Gear-Pair

The motion of the Rocker Red-14-1b controls the motion of the Geared-RockerRed-14-2 together with parameters in the Gear-Pair dialog.

Basic Gear-Pair Arrangements

Use Add Gear-Pair for these gear arrangements.

Gear-Pair: Fixed Gear Centers

External-Mesh

Internal-Mesh

Step Down:

# Teeth Gear 1 < Gear 2

Step Up:

# Teeth Gear 1 > Gear 2

Step Up:

# Teeth Gear 1 > Gear2

Step Down:

# Teeth Gear 1 < Gear2

gp-fixedstepdownex_zoom30

gp-fixedstepupex_zoom30

gp-fixedstepupint_zoom30

gp-fixedstepdownint_zoom30

Click to play each video

Gear-Pairs: Orbiting Gear Centers

External-Mesh

Internal-Mesh

# Teeth: Gear 1 < Gear 2

# Teeth: Gear 1 > Gear 2

# Teeth: Gear 1 > Gear2

# Teeth: Gear 1 < Gear2