The image on the right shows a machine from the popular TV game show "Tipping Point" - Leaving Cert DCG - Question C-4 - 2015

Next, divide the circumference of the drawn circle into a minimum of 12 equal sections. This can be achieved by calculating the angle for each segment, which is 30° (360°/12). Use a protractor to mark these segments accurately around the circle.

Take the line segment CD and divide it into 6 equal parts. Measure the total length of CD and mark the divisions at intervals of the calculated length using a ruler. Clear markings are essential for later steps.

For each of the segments marked on the circle, draw the arm AB at the respective angles. Start from the center O and extend to point A, ensuring to maintain the length of 112 mm. Repeat this for each of the 12 angles marked.

Finally, connect the endpoints of arm AB for each position to sketch the locus of point B. This should smoothly illustrate the path traced by point B as the crank OA makes one full revolution.

Begin by identifying the nearest approach of the knife edge follower to the cam centre, estimated at 42 mm. This should be marked clearly on the cam diagram.

Take the circle representing the cam and divide it into 12 equal sections, similar to the previous step with crank OA. This defines the intervals for the displacement diagram.

Draw horizontal divisions to represent each section of the 12-part division established earlier. These lines will be critical in measuring the rise, dwell, and return movements of the follower.

Using the established parameters, construct the Unidirectional Angle Ratio (U.A.R.) for the cam profile. The rise of 54 mm must be represented within the relevant interval.

Indicate the dwell period clearly on the displacement diagram, marking the segment between 180° to 240° where the follower remains stationary.

Carefully transfer the heights at each division from the displacement diagram onto the cam diagram, representing how the follower moves at each point in the rotation.

Draw the entire cam outline as influenced by the follower’s movement, ensuring that all parts are connected smoothly and accurately reflecting the distances determined.

Reconfirm the heights established on the cam diagram and ensure they are transcribed correctly onto the displacement diagram for clarity.

Finish by refining the displacement diagram to include all necessary elements for clarity, ensuring it aligns with your previously established measurements and the parameters of movement.