Tem­pers raised

Classic Bike (UK) - - Classic Workshop -

Colin Madelin con­tin­ues the theme of tem­per­ing springs. Gun­smiths achieve an even tem­per­a­ture by im­mers­ing the hard­ened spring in molten lead (350°C) so that it reaches a pur­ple/blue colour. Tem­per can be var­ied by adding 50/50 plumber’s sol­der or 60/40 elec­tri­cian’s sol­der (60% tin, 40% lead).

A known melt­ing point gives an ac­cu­rate tem­per­a­ture guide

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