Worked example · Design Technology · Year 7 · Beginner
LNF: Literacy → Writing → Connectives and syntax
Also assessed, DCF: Data and computational thinking → Problem solving and modelling
A complete model response and answer key for the Year 7 Design Technology cover lesson. Key answers: Correct card sequence from Stage 1 to Stage 8 is D (4 min), G (6 min), B (6 min), H (5 min), A (4 min), E (2 min), F (5 min), C (4 min). Total manufacturing time = 36 minutes. Usable time in a 50-minute lesson (minus 8 min setup/pack-away) = 42 minutes, leaving 6 minutes of buffer time.
| Stage no. | Card letter (A to H) | Short name of stage | Main tool / equipment | Time (min) |
|---|---|---|---|---|
| Stage 1 | Card D | Mark out cutting lines, bend line & hole centre | Steel rule & felt-tip pen | 4 min |
| Stage 2 | Card G | Saw waste corners just outside the line | Coping saw & soft-jaw vice | 6 min |
| Stage 3 | Card B | Cross-file and draw-file rough edges down to the line | Flat hand file & vice | 6 min |
| Stage 4 | Card H | Sand edges smooth from coarse to fine grit | Wet-and-dry paper (240 & 600 grit) & cork block | 5 min |
| Stage 5 | Card A | Drill the 5 mm keyring hole while the blank is flat | Pillar drill, 5 mm bit, machine vice & goggles | 4 min |
| Stage 6 | Card E | Peel protective plastic film off both faces | By hand & clean cloth | 2 min |
| Stage 7 | Card F | Heat along the bend line until soft and flexible | Strip heater (160°C) & heat-resistant gloves | 5 min |
| Stage 8 | Card C | Fold to 90 degrees and hold until cool and rigid | 90-degree wooden folding jig | 4 min |
| Total production time (including the 4-minute cooling wait in Stage 8): | 36 minutes | |||
Places all 8 stages into a safe, logical sequence (coarse shaping before fine polishing, drilling while flat, peeling film before heating, cooling in a jig) and calculates the total duration accurately. Evidences success criteria 1 and 2.
| Tool / stage | Required connective | Complete safety sentence |
|---|---|---|
| 1. Pillar drill | before | Clamp the flat acrylic blank tightly in a machine vice with scrap wood underneath and put on safety goggles before switching on the pillar drill. |
| 2. Strip heater (160°C) | while | Wear heat-resistant gloves and turn the acrylic every 15 seconds while heating the bend line over the 160°C strip heater so it does not burn your fingers or blister. |
| 3. Coping saw & vice | so that | Clamp the acrylic low down between soft wooden vice jaws so that the brittle plastic cannot vibrate, snap or get scratched during sawing. |
| 4. Film & cooling jig | otherwise | Peel off all protective film before heating and hold the bent acrylic in the 90-degree jig for 4 minutes, otherwise the plastic film will melt and the bend angle will spring back. |
Links each workshop hazard to its control measure using the specified subordinating or conjunctive connective with accurate punctuation. Evidences criterion 3.
Stage 1 (Marking out): Check the 90 mm by 35 mm acrylic blank, then use a steel rule and felt-tip pen to mark the curved corners, the bend line and the hole centre on the protective film so that the glossy surface is not scratched.
Stage 2 (Coping saw): Grip the acrylic low in the woodworker’s vice with soft jaws, and use a coping saw to cut neatly just outside the waste line so that the brittle sheet does not vibrate or crack.
Stage 3 (Flat hand file): Use a flat hand file to cross-file and draw-file the rough sawn edges down to the marked line while keeping the protective film on both faces.
Stage 4 (Wet-and-dry paper): Wrap wet-and-dry paper around a cork block, then sand the filed edges with coarse 240 grit before polishing them smooth with fine 600 grit and a drop of water.
Stage 5 (Pillar drill): Clamp the flat acrylic blank in a machine vice with scrap wood underneath and put on safety goggles before drilling the 5 mm keyring hole on the pillar drill.
Stage 6 (Peeling protective film): Peel the protective plastic film off both faces of the drilled and polished acrylic blank, and wipe away any dust before moving to the strip heater.
Stage 7 (Strip heater): Put on heat-resistant gloves and place the bend line over the 160°C strip heater, turning the acrylic every 15 seconds until the line is soft and flexible, otherwise the surface will blister.
Stage 8 (Cooling jig): Press the hot acrylic into the 90-degree wooden folding jig and hold it still for 4 minutes until it cools and sets hard.
Transforms all 8 unpunctuated notes into clear instructional sentences starting with imperative verbs, separated by commas and full stops, and strengthened with time and cause-and-effect connectives. Evidences criteria 3 and 4.
(a) Why Stage 6 sits between drilling and heating: You must keep the protective film on while sawing, filing, sanding and clamping in the machine vice so that the metal jaws and abrasive tools do not scratch the glossy acrylic faces. However, you must peel the film off before placing the acrylic over the 160°C strip heater, otherwise the thin plastic film will melt onto the hot acrylic and release unpleasant fumes.
(b) Lesson timing calculation:
Usable workshop time = 50 minutes − 8 minutes (register, aprons and tidy-up) = 42 minutes.
Spare buffer time = 42 minutes − 36 minutes (total production time) = 6 minutes of buffer time remaining.
Explains both constraints on Stage 6 using connectives of time, purpose and consequence, and verifies that the 36-minute plan fits comfortably inside the 42 usable minutes of the lesson. Evidences criteria 2, 3 and 5.
1. Partner task during the 4-minute cooling wait: While one pupil holds the warm acrylic steady in the 90-degree wooden jig for 4 minutes, their partner can return the coping saw, flat file and cork block to the tool rack and sweep any acrylic swarf off the workbench. Doing this while the plastic cools means the workbench is already tidy before the end of the lesson.
2. Skipping the flat file and 240 grit paper: A pupil must use the flat hand file and coarse 240 grit paper first, otherwise the fine 600 grit paper will clog up immediately and will not be coarse enough to remove the deep saw marks left by the coping saw.