bigegg
Scream Not Working Because Space Make Deaf
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I have a project where I want to make some rings from bicycle chain.
The rings will be a variety of sizes, and ideally as circular as possible.
The chain is old scrap, so each piece is stretched to a different degree - up to 10mm over a metre - that means a simple circle cut from mdf will not work.
I'm thinking a cone mandrel - from, say, 2" diameter to 12" diameter.
I have a suitably sized road cone that I can use as a form for concrete - a polystyrene core would reduce the weight, and for the single mix of concrete, stainless steel pins wouldn't be too expensive as reinforcing.
Alternatively, I could cast a cone from aluminium, or fabricate from bar + lots of infill + even more grinding.
Or: make a series of rings of about 30mm ply (2x15mm laminated) and bevel the edge @ about 15deg to give me a degree of tolerance for stretched chain?
The smallest ring would be 12 links/6in circumference/2" diameter.
Largest would be around 72 links/36in circumference/12" diameter.
Any other ideas?
The rings will be a variety of sizes, and ideally as circular as possible.
The chain is old scrap, so each piece is stretched to a different degree - up to 10mm over a metre - that means a simple circle cut from mdf will not work.
I'm thinking a cone mandrel - from, say, 2" diameter to 12" diameter.
I have a suitably sized road cone that I can use as a form for concrete - a polystyrene core would reduce the weight, and for the single mix of concrete, stainless steel pins wouldn't be too expensive as reinforcing.
Alternatively, I could cast a cone from aluminium, or fabricate from bar + lots of infill + even more grinding.
Or: make a series of rings of about 30mm ply (2x15mm laminated) and bevel the edge @ about 15deg to give me a degree of tolerance for stretched chain?
The smallest ring would be 12 links/6in circumference/2" diameter.
Largest would be around 72 links/36in circumference/12" diameter.
Any other ideas?