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Copper Foil: Sheet Rolled Thin with Anneals Between Passes
Copper foil is copper taken thinner than sheet. Copper hardens as it is worked and softens again when heated and quenched, so a sheet can be rolled down pass after pass, annealing whenever it stiffens, until it is thin enough to cut with scissors and wrap round a joint.
The picture: a strip of copper foil.
Intermediate
An afternoon
Instructions
1
1
Anneal the sheet
Anneal the sheet
Lay the copper sheet on fire bricks, heat it with the torch to a dull red seen in shade, and quench it in water.
Materials for this step:
Copper Sheet1 pieceTools needed:
Fire Brick
Propane Torch
Blacksmith Tongs
Quench Bucket
Safety Glasses2
2
Roll it down
Roll it down
Pass it through the rolling mill, closing the rolls a little each pass and always feeding the same way.
Tools needed:
Rolling Mill3
3
Anneal when it stiffens
Anneal when it stiffens
When it springs back and resists, anneal it again as in step 1, dry it, and carry on rolling.
Tools needed:
Propane TorchBlacksmith TongsQuench Bucket4
4
Measure and trim
Measure and trim
Measure the thickness with a micrometer; stop when it is as thin as you need. Trim the split edges with snips and give it a last anneal if it must bend.
Tools needed:
Micrometer
Tin SnipsMaterials
1- 1 piecePlaceholder
Tools Required
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