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how to design (crease-free) vinyl records bowls without waves

Most of you might know the bowls you can make out of old vinyl records (like: https://www.instructables.com/id/Vinyl-Record-Bowl-2/ OR https://www.instructables.com/id/Vinyl-Fruit-Bowl/).

But how the hell is this done:
http://bit.ly/1g9PL1h AND http://bit.ly/1erfVBd a bowl without waves. Just plain.
Any idea or insctrutable?

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ctx19853 years ago
I can't guarantee that this will work or not as I have never tried it, but perhaps you could try to make the bowl the normal way, but use two identical forms and press the record in between them while it is still hot. Just a thought. I may try it out today if I can find two identical forms!
The same way plastic sheets like acrylic and whatnot are formed into a nice shape. Use a vacuum forming machine. Plenty of DIY vacuum forming designs out there.
bigmacdaddy72 (author)  mpilchfamily3 years ago
DIY vacuum forming? Never heard.
But why should the record melt without waves in a vacuum?
And how to get the heat in a vacuum.

Seems to be instructable / foredoomed to me ;(
Look it up.
https://www.instructables.com/tag/type-id/?sort=none&q=vacuum+former

The record is heated before it's placed over a table with many holes in it and the form you want to make. The table is attached to your vacuum cleaner. The vacuum sucks the record down stretching it over the shape. The pressure on the record is distributed evenly across it as it stretches preventing any waves. 
+1

Don't forget to block the hole in the middle!