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<blockquote data-quote="Geoff1946" data-source="post: 501359" data-attributes="member: 28452"><p>Are you sure the material you have can be cut with a hot wire? I've never seen that done with upholstery foam. I've only seen it cut on a big band saw.</p><p></p><p>If it <u>will </u>cut that way getting a straight cut over 1.6m long is going to be challenging. How are you thinking of tensioning and moving the wire and holding the foam?</p><p></p><p>If you are going ahead then first locate some suitable wire. If it's around the gauge used in old fashioned electric fire elements then it's going to take around four amps to bring it to red heat. Hence, look up (google) the resistance of the wire you've found and ohm's law will tell you the sort of voltage you need. Remember that if you go above about 50 volts you are dealing with a hazardous voltage. Your power source can be AC or DC, but I think will need to be variable to control the wire temperature. Not the sort of thing that's easy to come by I'm afraid.</p><p></p><p>I reckon buying a thinner piece of foam would be an awful lot easier.</p></blockquote><p></p>
[QUOTE="Geoff1946, post: 501359, member: 28452"] Are you sure the material you have can be cut with a hot wire? I've never seen that done with upholstery foam. I've only seen it cut on a big band saw. If it [U]will [/U]cut that way getting a straight cut over 1.6m long is going to be challenging. How are you thinking of tensioning and moving the wire and holding the foam? If you are going ahead then first locate some suitable wire. If it's around the gauge used in old fashioned electric fire elements then it's going to take around four amps to bring it to red heat. Hence, look up (google) the resistance of the wire you've found and ohm's law will tell you the sort of voltage you need. Remember that if you go above about 50 volts you are dealing with a hazardous voltage. Your power source can be AC or DC, but I think will need to be variable to control the wire temperature. Not the sort of thing that's easy to come by I'm afraid. I reckon buying a thinner piece of foam would be an awful lot easier. [/QUOTE]
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