Making a flat spring

[David KParticipant @davidk77137]

I have some 0.3mm spring steel strip , i wish to cut a length approx 100mm long, then bend

it in the middle around a m3 drill to create a flat spring.

My question is , do i bend the steel cold to shape then heat treat it or heat it first and bend it hot.

Thanks

[BazyleParticipant @bazyle]

If it is currently springy – like a bit of clock spring – you may have difficulty in getting it tempered to anything like the original springiness. Best not to heat at all if it can be avoided.

[Author]

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