Joining things together
Design & Technology · Early Years · The School
Ways to join
Tape, glue, staples, string, split pins, slots. Each behaves differently: tape is fast and weak, glue is slow and strong, a split pin lets a part turn. Choosing a join is a real design decision, not an afterthought.
Matching the join to the job
If the two parts must MOVE, tape and glue are the wrong answer — you need a split pin or a slot. If they must never move, glue is better than tape. Ask 'does this part need to move?' before you reach for anything.
Testing it
Pull gently. Does it hold? A join that fails while you are testing is a small problem; one that fails when the model is finished is a big one. Testing early is not a sign that the work is bad — it is the work.
Join two strips of card three ways: with glue, with tape, and with a split pin. Now test each. Pull them apart — the split pin holds longest. Bend them back and forth twenty times — the glue cracks first. Wet them — the tape lets go. No join won every test, which is the point: choose the join for what the thing has to survive, not for what is nearest.
Choosing the right join
Different joins do different jobs and it is worth trying several before deciding. Glue is strong and slow and permanent. Tape is quick and weaker and can be peeled off. A split pin holds two pieces together and still lets them turn, which is how you make a moving arm or a pair of scissors. String can be untied. Before joining anything, ask one question: does this need to move, and does it need to come apart again? The answer usually chooses the join for you.