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The sketch shows a traditional dining table made from solid oak - Leaving Cert Construction Studies - Question 9 - 2012
Question 9
The sketch shows a traditional dining table made from solid oak. (a) Show, using notes and neat freehand sketches, a suitable method of jointing the front rail to t... show full transcript
Worked Solution & Example Answer:The sketch shows a traditional dining table made from solid oak - Leaving Cert Construction Studies - Question 9 - 2012
Step 1
Show, using notes and neat freehand sketches, a suitable method of jointing the front rail to the leg and discuss why the method of jointing shown is suitable.
Answer
A suitable method for jointing the front rail to the leg of the table is the Haunched Mortise and Tenon joint. This is a traditional method that is known for its strength and stability.
Sketch of Haunched Mortise and Tenon Joint
- Draw a side view of the leg and rail showing the mortise cut into the leg and the tenon extending from the rail.
Reasons for Suitability:
- Strength: This joint is robust and can withstand stress due to its design, which bears weight over a larger area.
- Resistance to Movement: The haunch adds additional strength by preventing the rail from twisting away from the leg, thus maintaining the table's structure.
- Longevity: Its traditional nature means it has been used successfully in furniture making for generations.
- Aesthetic Appeal: The visible craftsmanship associated with this joint enhances the overall look of the table.
Step 2
Show, using notes and neat freehand sketches, the steps involved in removing the marks and in preparing the tabletop for the application of a new applied finish.
Answer
The steps for restoring the tabletop include:
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Cleaning the Surface Thoroughly
- Begin by using a damp cloth to remove dust and dirt.
- Optionally, use a mild detergent if necessary, and allow it to dry completely.
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Sanding the Surface
- Use medium-grit sandpaper (about 120 grit) to begin sanding, focusing on areas with deep marks.
- Follow this with finer sandpaper (around 220 grit) to prepare for finishing.
- Ensure to sand with the grain to avoid damaging the wood.
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Using Steel Wool for a Smooth Finish
- Lightly rub the surface with fine steel wool to achieve a smooth texture, especially for areas that are uneven.
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Final Cleaning
- After sanding, clean the surface with a clean cloth to remove any dust particles accumulated from sanding.
Step 3
Recommend a suitable applied finish for the tabletop. Describe, using notes and neat freehand sketches, the steps to be followed when applying the recommended finish.
Answer
A suitable applied finish for the tabletop is Danish oil. This finish enhances the natural beauty of the wood while providing a level of protection.
Steps for Applying Danish Oil:
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Preparation of the Surface
- Ensure the surface is clean and free of dust before application.
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Applying the First Coat
- Using a clean cloth, apply the first coat of Danish oil liberally over the entire surface.
- Allow it to saturate the wood for about 10-15 minutes.
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Wiping Off Excess Oil
- After 15 minutes, wipe off any excess oil with a clean cloth to prevent a sticky surface.
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Curing
- Let the first coat cure for 24 hours. Ensure proper ventilation is maintained to allow the oil to dry.
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Applying Additional Coats
- Repeat the process for a second coat, lightly sanding with fine sandpaper between coats to enhance smoothness.
- Allow adequate drying time after each coat (24 hours recommended).
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Final Finish
- Once the final coat has cured, polish the surface with a soft cloth to achieve a desirable sheen.