Spring Steel : Making A Spring For Bolex Crank Handle
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To make the spring I'll use a feeler gauge. I'll heat it red hot so I can bend it. Then I'll polish it and then heat it only enough to turn blue. That will turn it into a spring.
The original spring measured about 0.3mm, so I used the 0.011" blade from this set.
The original spring measured about 0.3mm, so I used the 0.011" blade from this set.
Heating just until it turns blue. Now it is a spring.
BTW, when I make parts like this I err on the side of 'just a little too big' as the parts can be filed smaller if needed. In this case it fit just fine, so I left it this size.
BTW, when I make parts like this I err on the side of 'just a little too big' as the parts can be filed smaller if needed. In this case it fit just fine, so I left it this size.
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Hard to tell scale, but that looks very similar to a standard 1/4" cartridge fuse clip:
Don't forget K&S Precision Metals, sold in hardware stores. Hobby shops, Crafts stores, Home stores sells Phosphorus Bronze Spring metal in a sheet.
This can also be bought online.
Congratulations on making your repair and on the tip to use feeler gage steel, I know I'm not the only one that's found one or more of these sources of donation material from old toolboxes and yard sales, etc.
This can also be bought online.
Congratulations on making your repair and on the tip to use feeler gage steel, I know I'm not the only one that's found one or more of these sources of donation material from old toolboxes and yard sales, etc.
Was this steel annealed after the first or second tempering treatments?
It'll be a shame if it breaks because it's too brittle from no annealing being done.
It'll be a shame if it breaks because it's too brittle from no annealing being done.
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Entire books have been written on annealing. In this case, the flame heating steps outlined above reliably make the long-lasting spring steel. It won't reliably work if the steps are not followed exactly. Ovens and quenching not needed due to the tiny size.
Very nice work. How did you cut the feeler gage to begin with? Shears? A very neat cut.
And from my own experience drilling a nice round hole in thin metal like that isn't easy.
Hardening, tapering and annealing of steels is a bit beyond my skill set.
David
And from my own experience drilling a nice round hole in thin metal like that isn't easy.
Hardening, tapering and annealing of steels is a bit beyond my skill set.
David
The metal was thin enough to get a clean cut with "tin snips." (You can see the tip of them in post #7 above.)
The location for the hole was first center punched to keep the drill bit from wandering.
The location for the hole was first center punched to keep the drill bit from wandering.
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Nice work.
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