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.

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