hmtoggle_folder1How to add the Linear-Motion FB



Right-side of Graphic-Area: Kinematics toolbar > Linear-Motion FB


Add menu > Add Linear-Motion FB

How to Add:

1.Click the Linear-Motion FB in the Kinematics FB toolbar or Add Menu
2.Click in the graphic-area to 'place' the Linear-Motion FB.

The Linear-Motion FB in now in the graphic-area.

hmtoggle_folder1How to open the Linear-Motion FB
Double-Click  Linear-Motion FB

Linear-Motion FB

1.Double-click the Linear-Motion FB in the graphic-area, Assembly-Tree or Selection-Window

- or -

1.Click it in the graphic-area or the Assembly-Tree.

The Linear-Motion FB is now in the Selection-Window.

2.Right-click it in the Selection-Window
3.Click 'Edit Element...' in the contextual menu.
Right-Click Linear-Motion FB

Linear-Motion FB

- or -

1.Right-click the Linear-Motion FB in the graphic-area
2.Click Edit-Element in the contextual menu.

See also: How to Open Dialog-Box

hmtoggle_folder1Linear-Motion FB dialog-box

Default Output:

The default output from the Linear-Motion FB is equal to the Master Machine Angle

Output Function:

Edit to make the motion-values become 'before' or 'after' the Master Machine Angle.

The 'Function' of the Linear-Motion FB:

Output motion-value = Master Machine Angle + Constant

Optionally, select the Accumulate option, so that the output does not reset to 0 after each machine cycle.

The 'Function' of the Linear-Motion FB is then:

Output motion-value = (Revs * 360) + Master Machine Angle + Constant



Machine Angle +

The parameter is a constant which is added to the Master-Machine-Angle.


Output Option:

A check-box to determine whether the motion-value Resets to 0 after 360, or Accumulates after 360, and continues to increase.

Linear-Motion FB dialog-box

Linear-Motion FB dialog-box

Linear-Motion FB dialog-box:

'Machine Angle +'

Enter a motion-value in the Machine Angle + 'data box'.

In the example: the motion-value = '53.4'.

Thus, if the Master-Machine-Angle is '120', the output motion-value from the Linear-Motion FB = 120 + 53.4 = 173.4

When the Machine-Angle is made to be:
'Positive', then the output is 'before' [it 'leads'], the Master Machine Angle.
'Negative', then the output is 'after' [it 'lags'], the Master Machine Angle.

Output Options:

Reset after one Cycle [default option and most typical]
Output = Master Machine Angle + Value

- or -

Output = (Revs * 360) + Master Machine Angle + Value
3.Click the OK to close the dialog.

Notes on: 'Accumulate' or 'Reset after one Cycle' :

Generally, use Reset after one Cycle

Use 'Accumulate' when you want to model a watch, or a mechanism that does not have a motion-period equal to the Master-Machine-Angle.


You must use a Linear-Motion FB in the 'first' kinematic-chain in the 'first' Mechanism-Editor.

See Also:

Connecting FBs

Tutorial and Reference Help Files for MechDesigner and MotionDesigner 13.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd