Hi all, According to DIN and IS standards, springs made from wire or rod with a diameter above 16 mm should be hot coiled due to specific reasons. We have consulted with several manufacturers who claim they can cold coil springs using wire or rod up to 30 mm in diameter. Could you please advise if springs made from wire with a diameter ranging from 16 mm to 30 mm using the cold coiling process would be as effective as those made using the hot coiling process? I look forward to your valuable suggestions. Best regards, Johny
@@marcdion1521The giant black rod is actually made of steel. The fire is because they're using oil on it to keep the hot spring from sticking to it when they retract it. This is an unusual process. Normally when this is done they use a stopper on the end of the spring to keep it from turning and rotate the mandrel (the bar it's wound around) in the opposite direction than it's wound in while retracting it. This makes it bind less and gives more consistant length on the spring. It also allows the mandrel to be retracted without using oil on it.
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