Summary of this Step

We add the elements to move the Tool-Part along the Slide-Joint.

To do this:

1.We add a Motion-Dimension FB to the Slide-Joint

The Tool-Part becomes a 'Slider' - in the Kinematics-Tree.

2.We add two more FBs: a Linear-Motion FB ('Clock') and a Motion FB.
3.We connect the three FBs together with wires.

In MotionDesigner :

4.we add and edit a motion so that it is a 'Rise-Dwell-Return-Dwell' [R.D.R.D.] motion type. The motion 'Rise' is +50mm and the 'Return' is -50mm, back to 0mm.
5.We link the Motion FB to the new R.D.R.D motion.
6.Cycle the mechanism to watch the kinematic-chain move.

tog_minus        Video of this Step


Tutorial 6A-2

tog_minus        Add a Motion Dimension FB to the Slide-Joint


Click Add Motion-Dimension FB in the Kinematic-FB toolbar


The Command-Manager tells you which elements to select.

The full message in the Command-Manager - if you expand the width of the vertical bar of the panel is:

Click in turn: a Slide or Pin-Joint; a Green Line or Point; a Blue Line or Point.


STEP 1: Click the Slide-Joint1s-red

Click one of the rectangles that are the symbol of the Slide-Joint, or the Slide-Joint element in the Assembly-Tree.

STEP 2: Click a 'Point -  Solved (Green)'2s

Click a (Solved) start-Point2s of the Line in the Base-Part.

STEP 3: Click a 'Point - Free'3s – a Point on the Line in the Part that you can still drag (the Blue Part).

Click the Origin of the CAD-Line in the Part.

The Points and the Lines must be elements in the Slide-Joint.


Step 3 is complete

The image shows the Command-Manager with the elements in the boxes for the 'Add Motion-Dimension FB'.

STEP 4: Click OK in the Command-Manager.

When the first element is a Slide-Joint, the new Motion-Part is a Slider.


Step 4 is complete.

MechDesigner adds the Motion-Dimension1s-red between the Points in the Slide-Joint. The dimension is positive or negative.

You will usually want to edit the Base-Value of the Motion-Dimension.

STEP 5: Edit the Motion-Dimension to open the dialog-box

Double-click the dimension extension lines or arrowhead

- or -

Right-click the FB icon, then

Select the Edit Element icon, in the contextual sensitive icon palette.


The Motion-Dimension dialog-box opens.

Edit the 'Base-Value'1s-red

- or -

Edit the 'Base-Value + Motion Value'2s


Step 5 is complete in the near image.

Edit the 'Base-Value' to 40mm

In the image, ignore the Base-Value[75], and the Motion-Value [0.1599...].

tog_minus        Add a Motion FB and a Linear Motion FB


These Function-Blocks are very easy to add to the graphic-area.

In the Kinematic-FB toolbar

STEP 6: Click the Linear-Motion FB1s-red and then
Click in the graphics area.
STEP 7: Click the Motion FB2s and then
Click in the graphic-area.

Step 7 is complete. The Linear Motion FB1s-red and the Motion FB2s are in the graphic-area.

You now need to connect the Function-Blocks together with wires.

tog_minus        Connect the Function-Blocks together with wires


STEP 8: Connect the Function-Blocks, as shown1s-red2s

Drag from an 'output-connector' to an 'input-connector'.

Step 8 is complete.

STEP 9: Use Run menu > Cycle
- or -
Use the keyboard shortcut: 'C'

tog_minus        Add a New Motion to MotionDesigner


The Default Motion

When you add a Motion FB, MechDesigner links the Motion name that is first (left-most tab) in MotionDesigner to the Motion FB. This is the Default motion.

The default motion has four segments1s-red2s3s4s. The segments make a Rise-Dwell-Return-Dwell motion.

The Rise Segment1s-red is from 0 to 90. The Return Segment3s is from 90 to 0 [mm or degrees].

Therefore, Base-Value in the Motion-Dimension FB is 40mm, the Slider moves from 40 to 140mm.  Usually, the default motion is not the motion that you need.


Add a new Motion

STEP 10: Use Tools menu > Show/Hide MotionDesigner to show MotionDesigner

In MotionDesigner, add a new Motion tab.

STEP 11: Click Add Motion1s-red


STEP 12: Rename the Motion to 'Tool Motion'1s-red

To rename a Motion in MotionDesigner, you can right-click the Motion name-tab1s-red.

STEP 13: Edit the Motion so its Rise is 50 2s

[See below, for instructions to edit the motion, or see below]


- or -

Tutorial 2: Introduction to the Flexible Polynomial Segment


Keep the motion as a RDRD Motion.

The Rise Segment should increase from 0 to 50mm

Select Segment 2, use the Blend-Point Editor 'Pos' box, change it to 50 with the Spin-Box or your keyboard.

The Return Segment should take it back from 50 to 0mm.

See image to the left:

Select Segment 33s, click the Blend-Point Editor 'Pos' box1s-red, change it to 502s with the Spin-Box or your keyboard.

Each segment can take 90º of the MMA.

Step 13 is complete.

tog_minus        Link 'Tool-Motion' to the Motion FB


STEP 14: Double-click the Motion FB in the graphic-area, to open the Motion FB dialog-box

or See How to open a dialog-box

See dialog to the left.

STEP 15: Click the 'Select Motion' drop-down box and select 'Tool Motion' in the list 1s-red
STEP 16: Click OK
STEP 17: Now, again, Run > Cycle to watch the new motion.

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