A Chain-Link

We want to add a Chain-Link.

The Chain-Link is represented by one of the Parts in an RPR Dyad.

We add an RPR Dyad between a Point on Slider-Set 1 and a Point on Slider-Set 2.

As always, a Dyad has two Parts and three Joints.

Add a new Part and join it with a Pin-Joint(R) to a Point on Y-Slider of Slider-Set 1
Add a new Part and join it with a Pin-Joint(R) to a Point on Y-Slider of Slider-Set 2
Join the two new Parts together with a Slide-Joint(P).

The two Parts and three Joints make the RPR Dyad.

We use the Part that is joined to Slider-Set 1 as the 'Tool-Part'. We can add a 'Solid' to this Part.

Add an RPR Dyad to the Slider Sets, one of the Parts represents the Chain-Link

Remember, Dyads always have two Parts and three Joints.

Add an RPR Dyad between Slider-Set 1 and Slider-Set 2


Top-Tip: Temporarily hide the Motion-Dimension FBs. See Display Filers: Hide Dimensions

STEP 1: Add a Part1s-red
STEP 2: Rename Part1s-red to 'Tool-Part'.
STEP 3: Add a Pin-Joint2s between the Part1s-red and the start-Point of Y-Slider1
STEP 4: Add a Part3s
STEP 5: Add a Pin-Joint3s between the Part and the start-Point of Y-Slider2

The Two Parts and two Pin-Joints are the R Joints in the R – P – R dyad

We need a 'P' Joint to complete the dyad. P is a Prismatic-Joint.

Confusingly, we call a Prismatic-Joint a Slide-Joint.


STEP 1: Add a Slide-Joint5s between the CAD-Line in Part1s-red and the CAD-Line in Part3s

The Slide-Joint completes the RPR Dyad

The Part-Outlines become green.

When you cycle the machine, you will see the Dyad moves with the Slider-Sets1 and 2.

To show the length variation between the Pin-Joints:

STEP 2: Add a Measurement FB6s between the Pin-Joints

The length variation between the Pin-Joints is from 100mm to 93.55mm.

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