39 M ANUFACTURING H I -T ECH PEN M ANUFACTURING (V ERSION 1.2) DE SI GN IN G AN D MAKIN G A ‘ H I-TE CH ’ P E N W HAT YOU W ILL LEARN After com pleting th is pr oject, you sho uld be able to: • Work to a des ign brief and write a specif ication. • Recognise des ign constrai nts when d esignin g. • Turn metal and p lastics on a lathe with preci sion. • Make someth ing that requires the ass embly of several parts. . After com pleting th is pr oject, you sho uld un derstand: • Tha t apparently simple things such as pens require complex manufacturing processes. • How to measur e and cut rod and tubing. • How to use a lathe for facing off and turning m aterials. • How to measure diam eters and length accurately. • The importance of quality control in making s everal identical things.