The 3D graphic on the right shows a pedal-operated weaving machine - Leaving Cert DCG - Question C-4 - 2012
Question C-4
The 3D graphic on the right shows a pedal-operated weaving machine.
A link mechanism in the machine is similar to the one shown in line diagram format in Fig. C-4(a... show full transcript
Worked Solution & Example Answer:The 3D graphic on the right shows a pedal-operated weaving machine - Leaving Cert DCG - Question C-4 - 2012
Step 1
Draw links and circular paths as given.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To draw the links and paths, first sketch the links OA, BC, AD, and CP based on the provided lengths: OA = 32, BC = 42, AD = 80, CP = 165. Ensure the point O is designated at the center, and arms OA and BC are oriented correctly based on the anti-clockwise rotation.
Step 2
Divide semi-circle into equal parts.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Construct a semi-circle with a radius determined by the arm lengths. Divide this semi-circle into equal parts, marking the subdivisions clearly.
Step 3
Divide circle line corresponding to no. of equal parts.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Using the same radius as above, define the full circle's diameter and divide it into the same number of equal parts as the semi-circle, ensuring symmetry.
Step 4
Locate positions for point D.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Calculate the position of point D considering the rotation of arm BC. Use geometric constructions to mark point D's position accurately.
Step 5
Extend arm CD to determine points on required locus (point P).
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
From the determined position of point D, extend arm CD to plot the locus of point P. This should be traced accurately throughout the rotation.
Step 6
Draw required locus.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Finalize the drawing by smoothly connecting the plotted points to form the continuous locus of point P. This should represent all positions of point P throughout its full movement.
Step 7
Draw the given elevation of the cylinder and project a plan.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Begin by accurately sketching the elevation view of the cylinder as specified. Then project a horizontal plan view, ensuring alignment with the elevation.
Step 8
Draw the surface development of the front half of the cylinder, including points A and B.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Unroll the front half of the cylinder to create a flat surface representation. Mark the positions of points A and B on this development, ensuring spatial orientation is preserved.
Step 9
Determine height and width for development.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Measure the height and width of the cylinder. Use these dimensions to ensure the development is proportionate and accurately reflects the cylindrical shape.
Step 10
Locate points A and B on development.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
On the developed view, clearly mark points A and B, ensuring to reference their positions relative to the cylinder.
Step 11
Determine points on helix (min 4 incl. 'turning point').
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Calculate the coordinates for points along the helical slot. Include at least four distinct points, ensuring to mark the 'turning point' appropriately.
Step 12
Draw required helix.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Using the determined points, sketch the helical path accurately on the surface development, ensuring smooth continuity through the calculated points.
Step 13
Indicate rotation angle as required.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Measure and indicate the total angle of rotation needed for the cylinder to maintain the vertical cutting head position. This should be visually referenced on the diagram.
Join the Leaving Cert students using SimpleStudy...
