Tuesday, January 21, 2014

MAKING YOUR ASSEMBLIES DYNAMIC BY PRO – MECHANISM

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

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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.
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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.
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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
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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,
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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.
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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.
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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.
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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.
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· 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


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THANK YOU
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Ref- Sharptechdesign web.

Wednesday, March 27, 2013

Pro-Mechanism

COMPONENTS OF MECHANISM

In addition to being able to assemble components using realistic degrees of freedom, mechanism also does a lot more.  The typical progression to using mechanism is as follows.

Step 1 – Assemble Components

Create your assembly using mechanism connections to capture realistic degrees of freedom.  These connections are covered in great detail in the upcoming lessons.

Step 2 – Modify Joint Axis Settings

Control your connections by modifying the joint axes created by the connection.  This is explained in greater detail in the connection lessons individually.

Step 3 – Create Slots, Cams or Gear Pairs

Slots, Cams and Gear Pairs are special tools in mechanism that capture complex interactions between components.  These will each have their own lesson.

Step 4 - Drag Components and Create Snapshots

Dynamically pull or push on components that have open DOF to see them move in the assembly.  Take snapshots of your assembly at different states of motion to use in drawings or to come back to for reference.

Step 5 – Create Servo Motors or Force Motors

Servo motors and Force Motors are used to drive analysis and move your assembly on their own without using drag tools.  Each of these topics will be covered in great detail in their own lessons.

Step 6 – Create and Run Analyses

Start your animations to calculate the results you are looking for.  With servo motors in your assembly, you will be able to produce motion animations.  With Force motors, you will be able to calculate resultant forces and other measures while the animation is running.

Step 7 – View Results and Take Measurements

Run the animation to create MPEG movies, or to calculate interference along the path of the moving objects.  Create and view graphs that measure certain factors over time, such as position or force.

CONNECTION TYPES

The table at the top of the next page lists the different connections available through the component placement window at the time you assemble in a component.  In addition, the number of translational and/or rotational degrees of freedom are shown for each connection type.




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


There are two additional connection types in the list, but they don’t fit into the categories above.  These are the Rigid and General connections, and they allow you to use standard assembly placement constraints, such as Align, Mate, Insert, Tangent, etc.  We will see its usage in Mechanism later.