This mini-lesson covers Digital Technologies for Edexcel A-level Product Design: how CAD, CAM, CNC, CIM, PLCs and robotics are used to design and make products.
You will see parametric modelling and FEA, the CAD-to-CAM workflow, additive vs subtractive manufacture, and calculate a CNC machine output. Press Start to begin.
Digital · CAD
Computer-aided design (CAD)
CAD is designing on a computer. It supports:
2D and 3D modelling of parts and assemblies.
Parametric modelling — dimensions are driven by variables, so changing one figure updates the whole model.
Photorealistic rendering for client presentation.
Simulation and analysis such as FEA (finite element analysis) to test stress before making anything.
Advantages: fast iteration, accurate dimensions, easy sharing, and virtual testing that cuts prototyping cost. Drawbacks: software/training cost and reliance on hardware.
Quick check
Change one, change all
?A team changes one dimension on a bottle and the whole 3D model, including its mould, updates automatically. Which CAD capability is this?
Digital · CAM/CNC
CAM and CNC
CAM (computer-aided manufacture) turns a CAD model into machine instructions, usually G-code, that drive CNC (computer numerical control) machines:
CNC router / mill / lathe — automated wasting to high accuracy and repeatability.
Laser cutter — precise 2D profiling and engraving.
3D printers — additive manufacture (FDM, SLA, SLS) building parts layer by layer.
CAD/CAM workflow: model in CAD → generate tool paths (CAM) → output G-code → machine cuts/builds the part. This gives consistent quality across every unit.
Digital · systems
CIM, PLCs and robotics
Whole factories can be automated:
CIM (computer-integrated manufacture) — computers link design, production, stock and quality into one system.
PLC (programmable logic controller) — a rugged industrial computer that controls machinery, conveyors and sensors on a production line.
Robotics — programmable arms for welding, spraying, assembly and pick-and-place; ideal for repetitive, hazardous or high-precision tasks.
Automation raises consistency and throughput and works 24/7, but needs high capital investment and reduces the low-skill workforce.
Quick check
Why automate?
?On a car assembly line, programmable arms spot-weld every body shell identically, day and night. What is the main design/manufacture benefit?
Sort it
Sort the digital tools
Tap a term, then the group it belongs to.
🖥️ CAD (design)
⚙️ CAM/CNC (make)
🏭 Systems/automation
Quick check
Additive or subtractive?
?A prototype is built by depositing molten plastic layer upon layer until the part is complete. Is this additive or subtractive, and name the family.
Match it
Match each abbreviation to its meaning
Tap an item on the left, then its match on the right.
Term
Meaning
Calculate
Your turn — CNC output
1A CNC router makes one part every 45 seconds, running continuously through an 8-hour shift. How many parts can it produce in the shift?
parts
Hint: 8 hours = 8 x 3600 = 28800 s; then divide by 45.