Practical Engineering

3/8" diameter copper coil for Foden boiler fire tubes.

Below is a homemade coil straightening jig.

The coil was first uncoiled by hand to just over 3'. Then cut from the coil into 27. 1/4" lengths. The final straightening was achieved using the jig. Each Length at 27. 1/4" will allow for three fire tubes to be cut from each length and  finished to a size of 9".

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