Dyads are two Parts and three Joints.

There are five possible dyads in Planar Kinematics: R-R-R, R-R-P, R-P-R, R-P-P and P-R-P.

•The R stands for Revolute. This is identical to a Pin-Joint

•The P stands for Prismatic. This is identical to a Slide-Joint

A dyad does not add or remove degrees-of-freedom.

•2 Parts add 2 × 3 degrees-of-freedom

•3 Joints subtract 3 × 2 degrees-of-freedom

STEP 1: Add the R-R-P dyad  

Add the two Parts:

1.Kinematic-elements toolbar > Add Part | Drag to add the Part(A)

2.Kinematic-elements toolbar > Add Part | Drag to add the Part(B)

Add a Pin-Joint.

1.Kinematic-elements toolbar > Add Pin-Joint

Click the Point - start-Point of Part(A)

Click the Point  - the Point that has Trace-Point on the small gear.  

This is the R in the R-R-P dyad.

Add a Slide-Joint

1.Kinematic-elements toolbar > Add Slide-Joint

Click the Horizontal Line in the Base-Part

Click the Line along the center of the Part(B)  

This is the P in the R-R-P dyad.

Add a Pin-Joint.

1.Kinematic-elements toolbar > Add Pin-Joint

Click the Point (end-Point of Part(A)

Click the Point (start-Point of Part(B).  

This is the R in the R-R-P dyad.

The Parts become Green again. The two Parts are the new R-R-P dyad.

STEP 2: Cycle (ALT+C) to make sure the Parts can complete the cycle.

STEP 3: Edit the length of Part

Edit its length to be approximately equal to the radius of the Trace-Point.

When length of Part is approximately equal to the radius as the Trace-Point, the sliding-Part will approximately dwell at one end of the slide movement.

In my model, the length of Part is 370mm.