After a lot of web searching I could not find satisfactory instruction on cutting vinyl records for art. They are various suggestion scroll saw, band saw. dremel etc. but these l felt all left a rough or melted edge. I tried contacting Paul Villinski (http://www.paulvillinski.com) as he produces some great art but after several weeks he never replied. I finally found the solution and this instructable shows it.
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Signing UpStep 1: Tools for Cutting
The tool I discovered that works is call a hot knife normally used for cutting foam and leather according to the packet. It was a happy accident that lead to this discovery, I have been wanting to try pyrography for a while so picked up this kit http://www.amazon.co.uk/Weller-Woodburning-and-Hobbyists-Kit/dp/B000X8I86C/ref=sr_1_2?ie=UTF8&qid=1347454707&sr=8-2 and included was a hot knife so I gave it a go. It is by no means a fast processes but it does cut the vinyl leaving a smooth edge. I found you could either cut with several light passes or one slow deep pass. An alternative with works for big pieces was to cut part way through and then snap along the line. You do need to be aware that there is a chemical smell given off when cutting but this was no were near as bad as I expected and working in a well ventilated area seemed to dissipate it quickly. The kit also had other burning tips which could be used to add texture and detail to the design.
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http://www.youtube.com/watch?v=ieSn5Kpr6cs