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(a) The graphic on the right shows a Fluid Agitator, as used when donating bodily fluids - Leaving Cert DCG - Question C-4 - 2018
Question C-4
(a) The graphic on the right shows a Fluid Agitator, as used when donating bodily fluids. Movement is generated by a link mechanism, which causes the tray to rock to... show full transcript
Worked Solution & Example Answer:(a) The graphic on the right shows a Fluid Agitator, as used when donating bodily fluids - Leaving Cert DCG - Question C-4 - 2018
Step 1
Plot the locus of point P
Answer
- Begin by drawing the lines OA, CB, and AB according to the dimensions given, ensuring Crank OA is represented at 48mm from point O.
- Using a compass, set the radius to 110mm and draw arcs for the link AB, pin-jointed at points A and B.
- As crank OA rotates through 360 degrees, use the midpoint of link AB to plot point P in multiple positions, creating a circular path that represents the locus of P.
Step 2
Determine and indicate, in degrees, the maximum angle of rotation of link CB
Answer
- Analyze the movement of link CB which pivots at point C.
- Since link CB is fixed at 110mm, calculate the angles formed at positions where the motion limits occur.
- Using geometric properties, identify the point where link CB reaches its maximum extension.
- This maximum angle can be approximated using trigonometric identities relating to the lengths of links and the resulting angles.
Step 3
Draw the plan of the spiral
Answer
- Start by outlining a circular base for the inverted cone which represents the spiraling path.
- Use the center as the reference point and set a radius that is appropriate based on the spiral’s dimensions.
- Sketch the Archimedean spiral according to the specified dimensions, ensuring equidistant spacing between turns.
Step 4