MAKING YOUR ASSEMBLIES DYNAMIC BY PRO – MECHANISM

Mechanism

      A mechanism is a device designed to transform input forces and movement into a desired set of output forces and movement.

Pro-Mechanism is a very useful module to design the mechanism and to know the dynamic path of the parts, interference in an assembly.

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Bodies

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Connections of Bodies

ØMost Used Connections

ØPin

ØCylinder

ØPlanner

ØSlot

ØBall

ØSlider

ØAlso, we have

ØBearing

ØRigid & weld

ØGeneral

Ø6DOF

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Connection - Pin

The pin connection is used to rotate the part about an axis.

Examples:-

üDoor that swings open

üWheel that turns

Pin - axis alignment and a translational constraint 

Joint Axis settings on Rotational motion

   Joint Axis setting is used for control the rotation of a part with some specified angle like 0 deg to 180 deg.

 

Drag - Drag is the option is used for check the motion of the rotating part manually.

Servo Motor – Animate the part  & Run the assembly.

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Connection - Cylinder

The cylinder connection is used to capture a component moving in a direction, and able to rotate about that direction

Examples:- 

üCycle air pump

üPiston action on cylinders

Joint Axis settings on Parallel Motion

  Joint Axis setting is used for control the distance  of a moving part within specified distance like 1 to 50 mm.

Reverse Servo Motor – Animate the part

Run the assembly.

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Connection - Planer 

A Planar connection is used to ensure that a datum plane or planar surface always touches another plane or planar surface,

Examples:-

üLM Guide Rail & Runner Block

üA box sliding across a floor

üAny object that rests on a flat surface, but can be moved about that surface.

üPlaner  - Plane moves on Plane

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Connection - Slot

Slot Connection is used to move a component along a path.

 

Examples:

Bevel Gauge

Geneva Mechanism

Slot – Point Moves on Curve

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Connection - Ball

ball connection is used to simulate a joint where the translation is completely fixed, but all rotational degrees of freedom are available.

Examples:-

Toggle Switch

Ball joint gas springs

Ball Connection - require two points or vertices to be aligned, and they have no joint settings.

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Cam Follower

A Cam-Follower is used to simulate an object moving along the surface of another object.

Example-  All Cam design applications

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Gear Connection

Gear pairs are used to simulate two gears in mechanism

Standard – Use this when you want your two gears to rotate in the same or opposite directions, such as a spur-spur or worm and wheel gear.

Rack and Pinion – Use this when you want to be able to translate rotational motion into translational motion.

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Interference checking & Create a movie file 

We can capture a playback result set as an MPEG file, or as a series of JPEG, TIFF, or BMP files by using playback option.

· Start Time = 0

· End Time = 10

· Frame Rate = 10

· Minimum Interval = .1

· Frame Count = 101     

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Summary

COMPONENTS OF MECHANISM

  

Step 1 – Assemble Components

Step 2 – Modify Joint Axis Settings

Step 3 – Create Cams or Gear Pairs

Step 4 - Drag Components

Step 5 – Create Servo Motors

Step 6 – Create and Run Analyses

Step 7 – Check interference & Create a movie file

Connection Type	Translational DOF	Rotational DOF	References Needed
Pin	0	1	2 Axes or Edges & 2 Planes, Planar Surfaces, Datum Points or Vertices
Slider	1	0	2 Axes or Edges & 2 Planes or Planar Surfaces
Cylinder	1	1	2 Axes or Edges
Planar	2	1	2 Planes or Planar Surfaces
Ball	0	3	2 Datum Points or Vertices
Bearing	1	3	1 Datum Point and 1 Axis or Edge
Weld	0	0	2 Coordinate Systems

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PRACTICE MAKES YOU PERFECT

THANK YOU

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Ref- Sharptechdesign web.