📚 Year 10 WJEC Engineering: Key Points for Experimental/Practical Assessments | Year 10 WJEC 工程：实验/实践考核要点
In WJEC Year 10 Engineering, practical assessments form the backbone of your skill development and contribute directly to your final grade. These tasks test your ability to plan, manufacture, inspect and evaluate engineering products safely and accurately. Understanding the key areas of focus – from workshop safety to quality control – will help you build confidence and achieve high marks in your practical exams and controlled assessments.
在 WJEC Year 10 工程课程中，实践考核是你技能发展的核心，并直接影响你的最终成绩。这些任务测试你安全、准确地规划、制造、检验和评估工程产品的能力。了解重点领域——从车间安全到质量控制——将帮助你建立信心，并在实践考试和受控评估中取得高分。
1. Health and Safety in the Workshop | 车间安全
Before any machine is switched on, you must demonstrate a strong commitment to health and safety. Your teacher will observe your behaviour throughout every practical session, and careless actions can lead to instant disqualification from that assessment task.
在任何机器启动之前，你必须表现出对健康与安全的高度重视。你的老师会在每次实践过程中观察你的行为，粗心的操作可能导致你立即被取消该评估任务的资格。
Wear your personal protective equipment (PPE) at all times. This includes safety glasses to shield your eyes from swarf and dust, an apron or overalls to protect your clothes and skin, and sturdy leather shoes that cover your toes. Loose clothing, long hair and jewellery must be secured or removed before entering the workshop because they can easily become entangled in rotating machinery.
始终穿戴个人防护装备（PPE）。这包括防护眼镜，以保护眼睛免受切屑和粉尘的伤害；围裙或工作服，以保护衣物和皮肤；以及覆盖脚趾的结实皮鞋。宽松的衣服、长发和首饰必须在进入车间前固定或移除，因为它们很容易被旋转的机器卷入。
Know the location of all emergency equipment: the red mushroom-head emergency stop buttons on each machine, the fire extinguishers, the fire blanket and the first-aid box. In the event of an accident, stop the machine immediately if it is safe to do so and alert your teacher. Never attempt to clear jammed material or adjust a machine while it is still coasting or powered on.
了解所有应急设备的位置：每台机器上的红色蘑菇头紧急停止按钮、灭火器、灭火毯和急救箱。如果发生意外，在安全的情况下立即停止机器，并告知老师。切勿在机器仍在滑行或通电时试图清理堵塞的材料或调整机器。
Conduct a quick risk assessment before each operation. For example, when using a pillar drill, check that the drill bit is sharp and securely tightened, the guard is in place, the workpiece is clamped, and that you are not drilling into the machine table. Documenting these checks in your practical log can earn you extra planning marks.
每次操作前进行快速风险评估。例如，使用台钻时，检查钻头是否锋利并牢固锁紧，防护罩是否就位，工件是否被夹紧，以及你钻孔时不会钻到机器工作台上。将这些检查记录在你的实践日志中可以为你赢得额外的规划分数。
2. Reading Engineering Drawings | 阅读工程图纸
Your practical task will always begin with an engineering drawing. This might be an orthographic projection, an isometric sketch, or a CAD-generated drawing with dimensions. You must extract all the information needed to make the product without constant questioning.
你的实践任务总是从一张工程图纸开始。这可能是一幅正交投影图、等轴测草图或带有尺寸的 CAD 生成图纸。你必须提取出制造产品所需的所有信息，而无需不断提问。
rt dashed). The dimensions are given in millimetres, and you must understand symbols such as Ø for diameter, R for radius, and □ drawing says M8 × 1.25, it means an ISO metric thread of 8 mm diameter and 1.25 mm pitch.
正交视图通常显示前视图、俯视图和侧视图。学会阅读隐藏细节线（虚线）和中心线（长短虚线）。尺寸以毫米为单位，你必须理解直径符号 Ø、半径符号 R 和方形符号 □。如果图纸上标有 M8 × 1.25，则表示直径为 8 mm、螺距为 1.25 mm 的 ISO 公制螺纹。
Tolerance information is essential for interchangeable parts. A dimension like 15±0.2 mm means the finished size must be between 14.8 mm and 15.2 mm. Your final piece will be measured with a micrometer or vernier calliper to check compliance. Always identify the datum surfaces from which measurements are taken, as these establish a reference point for all machining operations.
公差信息对于可互换零件至关重要。像 15±0.2 mm 这样的尺寸意味着成品尺寸必须在 14.8 mm 到 15.2 mm 之间。你的最终作品将用千分尺或游标卡尺测量以检查合规性。始终识别出测量的基准面，因为它们为所有机加工操作建立了参考点。
When interpreting an isometric drawing, remember that circles appear as ellipses. Do not attempt to drill a hole at an angle simply because the isometric view shows it as elliptical. Refer back to the orthographic drawing to confirm the true shape and orientation of each feature.
在解读等轴测图时，请记住圆形会显示为椭圆。不要仅仅因为等轴测视图显示孔为椭圆形就尝试以某个角度钻孔。返回正交图纸确认每个特征的真实形状和方向。
3. Selecting Engineering Materials | 选择工程材料
The material you choose affects cutting speeds, tool life, finishing quality and product performance. In the workshop, you will mainly work with mild steel, aluminium, brass, various plastics (such as acrylic, nylon and HDPE) and sometimes hardwood or MDF for jigs and formers.
你选择的材料会影响切削速度、刀具寿命、精加工质量和产品性能。在车间里，你主要会使用软钢、铝、黄铜、各种塑料（如丙烯酸、尼龙和 HDPE），有时还会使用硬木或中密度纤维板（MDF）制作夹具和模具。
| Material | 材料 | Key Properties (English) | 主要特性 (中文) |
|---|---|---|---|
| Mild Steel | 软钢 | High tensile strength, weldable, magnetic, rusts easily | 抗拉强度高，可焊接，有磁性，易生锈 |
| Aluminium | 铝 | Lightweight, corrosion-resistant, good thermal conductor, softer | 轻质，耐腐蚀，导热性好，较软 |
| Brass | 黄铜 | Decorative, easy to machine, corrosion-resistant, harder than aluminium | 装饰性强，易机加工，耐腐蚀，比铝硬 |
| Acrylic | 丙烯酸塑料 | Transparent, brittle, can be polished, scratches easily | 透明，脆性，可抛光，易刮花 |
| Nylon | 尼龙 | Tough, low friction, self-lubricating, absorbs water | 坚韧，低摩擦，自润滑，吸水 |
Consider the material's workability: mild steel requires slower speeds and cutting fluid, while aluminium can be cut faster but may clog file teeth. When filing acrylic, keep the edges supported to prevent chipping. Sustainability is also assessed; mention if your chosen material is recyclable or if you have minimised waste by nesting parts efficiently on the stock sheet.
考虑材料的可加工性：软钢需要较慢的切削速度和切削液，而铝可以更快地切削，但可能会堵塞锉刀齿。锉削丙烯酸时，支撑好边缘以防止碎裂。可持续性也是评估点之一；提及你选择的材料是否可回收，或者你是否通过在原材料板上高效地排样零件来最大限度地减少浪费。
4. Measuring and Marking Out | 测量与划线
Accurate marking out is the foundation of a successful practical outcome. If you make a marking error of just half a millimetre, the entire part may be rejected for being out of tolerance. Always use the correct tools and double-check every measurement before cutting.
精确的划线是实践成功的基础。如果你产生仅半毫米的划线误差，整个零件可能因超出公差而被判不合格。务必使用正确的工具，并在切割前仔细检查每一个尺寸。
Essential measuring tools include a 300 mm steel rule, a try square, a centre punch, a scriber and a pair of odd-leg callipers. For higher precision, you will use a vernier calliper capable of reading to 0.02 mm. Before using a vernier, check that the zero line on the sliding scale aligns perfectly with the zero on the main scale when the jaws are closed.
基本的测量工具包括一把 300 mm 的钢尺、一把直角尺、一个中心冲、一个划线针和一把单脚卡钳。要获得更高精度，你将使用能够读到 0.02 mm 的游标卡尺。使用游标卡尺之前，在量爪闭合时检查滑动标尺上的零线与主尺上的零线是否完全对齐。
Marking out procedure: first, clean the material surface and apply marking blue if the surface is metallic. Use the steel rule and try square to scribe the outline of your workpiece. Always mark from a datum edge or face to avoid cumulative errors. Once your lines are scribed, dimple the intersection points with a centre punch and hammer – this prevents the drill bit from wandering when you start drilling.
划线步骤：首先清洁材料表面，如果是金属表面可涂上划线蓝油。使用钢尺和直角尺划出工件的轮廓。始终从基准边或基准面开始标记，以避免累积误差。线条划好后，用中心冲和锤子在交点处打出小凹坑——这可以防止钻头在开始钻孔时打滑偏移。
For cylindrical work, use a surface gauge on a marking-out table to scribe lines at consistent heights. Never rely solely on a pencil line when working with metals; a scriber line is finer and remains visible under cutting fluid.
对于圆柱形工件，在划线平台上使用高度划线尺来划出高度一致的线条。加工金属时，切勿只依赖铅笔线；划针线更细，并且在切削液下仍清晰可见。
5. Cutting and Shaping Techniques | 切割与成形技术
The practical exam requires you to cut and shape materials to within the specified tolerances. This could involve hand sawing, filing, drilling, turning on a lathe, or using a milling machine under supervision. Each technique has its own rules for safe and accurate operation.
实践考试要求你切割并成形材料，使其在规定的公差范围内。这可能涉及手工锯割、锉削、钻孔、在车床上车削或在监督下使用铣床。每种技术都有其安全和精确操作的要求。
When sawing with a hacksaw, select the correct blade pitch: 18 teeth per inch (TPI) for thick mild steel, 24 TPI for thin-walled tubes, and 32 TPI for aluminium sheet. Always start the cut with light pressure and guide the blade using your thumb until a groove forms. Keep the saw frame at the correct angle and use long, steady strokes.
使用钢锯锯割时，选择正确的锯条齿距：厚软钢用每英寸 18 齿（18 TPI），薄壁管用 24 TPI，铝板用 32 TPI。始终以轻压力开始切割，并用拇指引导锯条直到形成一个凹槽。保持锯架角度正确，并使用长而稳定的行程。
Filing removes small amounts of material and brings the workpiece to final dimensions. A cross-filing technique (pushing the file diagonally across the work) removes stock quickly, while draw-filing (pulling the file sideways along the surface) gives a smooth finish. Secure the workpiece in an engineer's vice with soft jaws when working with finished surfaces to prevent damage.
锉削可以去除少量材料，并使工件达到最终尺寸。交叉锉削技术（将锉刀沿对角线方向推过工件）可以快速去除余量，而拉锉（将锉刀横向沿表面拉动）可获得光滑的表面。加工已精加工表面时，用带软钳口的台虎钳夹紧工件，以防损坏。
Drilling on a pillar drill requires the correct spindle speed. For a 6 mm hole in mild steel, use about 1200 rpm; for the same hole in aluminium, 2500 rpm is suitable. Always use a centre-punched mark and clamp the work securely. Apply cutting fluid to steel, but drill most plastics dry to avoid stress cracking.
在台钻上钻孔需要正确的主轴转速。在软钢上钻 6 mm 孔时，转速约为 1200 rpm；在铝上钻相同孔径时，适合用 2500 rpm。始终使用中心冲标记并牢固夹紧工件。钢件加工时使用切削液，但大多数塑料应干钻以避免应力开裂。
6. Joining Methods | 连接方法
Practical assessments often require you to assemble components. The choice of joining method depends on the materials, required strength and whether the joint needs to be permanent or temporary. Common methods include soft soldering, silver brazing, mechanical fasteners, adhesives and riveting.
实践考核通常要求你组装零部件。连接方法的选择取决于材料、所需强度以及连接是永久性的还是可拆卸的。常见的方法包括软钎焊、银钎焊、机械紧固件、粘合剂和铆接。
Soft soldering is used for electrical connections and sheet metal joints where strength is not critical. The process requires a soldering iron, multicore solder and flux. Ensure surfaces are clean and tinned before making the joint. The finished joint should appear shiny and concave; a dull, grainy surface indicates a 'dry joint' that is mechanically weak and will lose marks.
软钎焊用于强度要求不高的电气连接和钣金接合。该过程需要烙铁、多芯焊锡丝和助焊剂。确保表面清洁并预先上锡，然后再进行连接。完成的焊点应光亮且呈凹形；暗淡、颗粒状的表面表明存在“虚焊”，机械强度差，会被扣分。
Mechanical fasteners such as nuts, bolts and washers create strong, demountable joints. When assembling a bolted structure, use flat washers under both the bolt head and the nut to distribute the load. Tighten fasteners in a cross-pattern to avoid distortion. Over-tightening aluminium threads can strip the thread immediately, so use a torque wrench if available.
螺母、螺栓和垫圈等机械紧固件可形成坚固的、可拆卸的连接。在组装螺栓连接结构时，在螺栓头和螺母下方都使用平垫圈以分散载荷。以对角线顺序拧紧紧固件以避免变形。过度拧紧铝制螺纹会导致螺纹立即滑牙，因此如果可能，请使用扭力扳手。
When adhesives are specified in your task, select an epoxy resin for metals or a cyanoacrylate (super glue) for small plastics. The surfaces must be degreased, lightly abraded and clamped while the adhesive cures. Document your clamping time and temperature to demonstrate awareness of process control.
当任务中指定使用粘合剂时，金属选用环氧树脂胶，小型塑料件选用氰基丙烯酸酯（快干胶）。粘接表面必须脱脂、轻微打磨并在胶水固化期间夹紧。记录你的夹紧时间和温度，以展示过程控制意识。
7. Finishing Techniques | 精加工技术
A well-finished product not only looks professional but also resists corrosion and feels comfortable to handle. Finishing can be a multi-stage process that includes deburring, sanding, polishing, painting or plating. Marks are often allocated specifically for surface finish quality, so do not rush this final stage.
精加工良好的产品不仅外观专业，还能抗腐蚀，并且手感舒适。精加工可能是一个多阶段的过程，包括去毛刺、砂纸打磨、抛光、喷漆或电镀。表面精加工质量通常有专门的评分，所以不要在最后阶段匆忙赶工。
Remove all sharp edges and burrs using a fine file, a deburring tool or abrasive paper. Pay special attention to edges that were cut or drilled. Run your fingertip along every edge to feel for any roughness.
用细锉刀、去毛刺工具或砂纸去除所有锐利边缘和毛刺。特别注意切割或钻孔产生的边缘。用指尖触摸每个边缘，感受是否有任何粗糙感。
Sanding or polishing should progress through grit sizes. For metals, start with 180-grit emery cloth, then 400-grit wet-and-dry paper, and finish with a polishing compound on a soft cloth to achieve a mirror finish. For acrylic edges, sand with 400, 800 and 1200-grit paper, then buff with a polishing paste. Any deep scratches left behind will be visible under inspection lighting.
砂纸打磨或抛光应逐步增加粒度。对于金属，先用 180 目的金刚砂布，再用 400 目的水砂纸，最后在软布上涂抛光膏进行抛光，以获得镜面效果。对于丙烯酸边缘，依次用 400、800 和 1200 目砂纸打磨，然后涂上抛光膏进行擦拭。任何残留的深划痕在检验灯光下都会很明显。
If painting is required, apply a suitable primer first. For mild steel, use a zinc-rich anti-rust primer. Apply two thin topcoats, letting each coat dry fully before applying the next. Mask off any surfaces that must remain paint-free with tape to ensure crisp boundaries, which demonstrates good masking technique.
如果需要喷漆，先涂上合适的底漆。对于软钢，使用富锌防锈底漆。然后涂两层薄的面漆，每层完全干燥后再涂下一层。用胶带遮蔽任何不能沾漆的表面，以确保边界清晰，这展示了良好的遮蔽技术。
8. Quality Control Checks | 质量控制检查
Quality control (QC) is an ongoing process, not just an inspection at the end. Throughout your practical work, you must measure, test and record critical dimensions to prove that your product meets the drawing specifications. Your QC log is often a required part of the assessment evidence.
质量控制（QC）是一个持续的过程，而不仅仅是最终的检验。在整个实践过程中，你必须测量、测试和记录关键尺寸，以证明你的产品符合图纸规格。你的质量控制日志通常是评估证据的必要组成部分。
Set up a simple inspection plan. Identify at least three critical features on your part, such as overall length, hole diameter and squareness. Measure each feature with the appropriate instrument and compare the reading against the drawing tolerance. Record the actual size in a QC table.
建立一个简单的检验计划。在你的零件上确定至少三个关键特征，例如总长度、孔径和垂直度。使用合适的仪器测量每个特征，并将读数与图纸公差进行比较。将实际尺寸记录在质量控制表中。
Squareness can be checked with an engineer's try square held against a datum face. Hold the work up to a light source; any gap reveals out-of-squareness. For hole positions, use a vernier calliper to measure the distance from the hole centre to the designated datum edge. If the dimension is critical, remember to halve the measured hole diameter to find the centre distance accurately.
垂直度可以用工程师直角尺靠在基准面上来检查。将工件对着光源举起；任何缝隙都表明不垂直。对于孔的位置，使用游标卡尺测量孔中心到指定基准边的距离。如果尺寸很关键，请记住将测得的孔径除以二，以准确找到中心距。
Functional testing also matters. If your product is a small mechanism, check that it moves freely without binding. If it is a press-fit assembly, verify that the joint cannot be twisted by hand. Any deviation from the specification must be analysed and explained in your evaluation.
功能测试也很重要。如果你的产品是一个小型机构，检查它能否自由活动而不会卡滞。如果是压配合装配，请验证该连接不能用手扭动。任何不符合规格的偏差都必须在评估中进行分析和解释。
9. Problem-Solving During Practical Tasks | 实践任务中的问题解决
In a real workshop, things rarely go perfectly the first time. Examiners want to see how you respond to challenges, whether it is a broken tool, a mismarked hole, or a material defect. Your ability to solve problems independently while maintaining safety is a key assessment criterion.
在实际车间中，事情很少一次就完美。考官希望看到你如何应对挑战，无论是工具损坏、孔位标错还是材料缺陷。你在保持安全的同时独立解决问题的能力是一个关键的评估标准。
If you drill a hole slightly off-position, do not panic. You might be able to enlarge the hole and fit a bush, or adjust the mating part slightly if the design permits. Always consult your teacher before making a major change, but show initiative by describing the problem and your proposed solution.
如果你钻的孔位稍微偏移，不要惊慌。你可能可以扩大孔并安装一个轴套，或者在设计允许的情况下稍微调整配合件。在进行重大更改之前，务必咨询你的老师，但通过描述问题和提议的解决方案来展示主动性。
Tool breakage, especially taps and small drill bits, is common. If a tap snaps in a blind hole, do not attempt to drill it out without a proper tap extractor set; you risk damaging the workpiece permanently. Instead, note the incident in your logbook and seek assistance. You can often recover marks by explaining the cause and how it could be prevented in future – for example, using more cutting fluid or clearing swarf more frequently.
工具断裂，尤其是丝锥和小钻头，是很常见的。如果丝锥在盲孔中折断，不要在没有合适的断丝锥取出器的情况下试图将其钻出；这可能会导致工件永久损坏。相反，在日志中记录此事件并寻求帮助。你通常可以通过解释原因以及未来如何预防（例如使用更多切削液或更频繁地清理切屑）来挽回分数。
Material defects such as hidden cracks or excessive warping may only become visible after machining has begun. Inspect your raw material thoroughly under good light before you start. If a defect appears mid-task, photograph it and show your teacher. Your assessment can still score highly if you demonstrate good judgement in scrapping the part and restarting rather than continuing with a flawed piece.
Published by TutorHao | Year 10 工程 Revision Series | aleveler.com
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