Cranks, Rockers, Sliders

In this step, we connect these Function-Blocks (FB):

A Linear-Motion FB
A Motion-Dimension FB
A Motion FB and a Gearing FB

These FBs, together, specify how and when a Crank, Rocker or Slider moves.

tog_minus        A Rocker

MD-32-FB-WATCHA

+

MD-32-FB-MTIONA

+

MD-32-FB-MTDIMA

A Rocker is a Part that rotates around a Pin-Joint with a motion as defined by the input to a Motion-Dimension FB

QST6-3-4

The image shows a Rocker. To add a Rocker:

The initial angle, here 40º2s, is the 'Base-Value'.

2.Add a Motion FB3s to the graphic-area.
3.Add a Linear-Motion FB4s to the graphic-area.
4.Connect the Linear-Motion FB to the Motion FB to the Motion-Dimension FB, by dragging a wire from the output-connectors to the input-connectors.
5.To edit the FBs, double-click the icons.

See the video

 

tog_minus        A Crank

MD-32-FB-WATCHA

+

MD-32-FB-PINMDA

 

In MechDesigner, the Crank is a simplified Rocker. It rotates at constant speed.

QST6-3-1

The 'Crank':

1.A Part joined to a 'kinematically-defined' Part with a Pin-Joint
2.The angle between the parts defined with a Motion-Dimension FB1s-red
3.Add and connect a Linear-Motion FB2s to the input of the Motion-Dimension FB

 

To reverse the direction of the Crank, add and connect a Gearing FB3s between the Linear-Motion and Motion-Dimension FB, and edit it to change the ratio to -1.

tog_minus        A Slider

MD-32-FB-WATCHA

+

MD-32-FB-MTIONA

+

MD-32-FB-SLIMDA

A Slider is a Part that reciprocates, back-and-forth, along a Slide-Joint.

QST6-3-5

The image shows a Slider. To add a Slider:

The initial position, here 7.98mm2s, is the 'Base-Value'

2.Add a Motion FB3s to the graphic-area
3.Add a Linear-Motion FB4s to the graphic-area.
4.Connect the Linear-Motion FB to the Motion FB to the Motion-Dimension FB.
5.To edit the FBs, double-click the icons.

 

See the video to the left.

Help Files for MechDesigner and MotionDesigner 11.1 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd