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« on: November 10, 2010, 06:23:02 AM »
findvikas
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I have a hot wire cutter where the wire sits in steady place when cutting and I want to make some cylindrical fuselage for one of my model. Wondering what is the best way to do it. What I have in my mind for now is to place the foam steady and move the wire around it to cut the shape. Any expert advise here ??
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« Reply #1 on: November 10, 2010, 08:29:43 AM »
bmanoj2
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I am not an expert in hot wire cutting, I have tried it only few times. But in my opinion its better to keep the cutter in one place as its difficult to handle with the wire connected to the power supply. It will be easier to hold the foam steady if you make some support under it when you are pushing/cutting it (like 2 no pipes of same diameter).
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« Reply #2 on: November 10, 2010, 10:53:10 AM »
findvikas
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Yes.. the wire will be steady and still rotate around it... see my idea on paper... I think it should serve the purpose
foam cutter.jpg
Re: How to cut cylindrical fuselage out of foam?
* foam cutter.jpg (41.28 KB, 726x782 - viewed 1656 times.)
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« Reply #3 on: November 10, 2010, 10:53:55 AM »
findvikas
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Blue thing is foam piece
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« Reply #4 on: November 10, 2010, 10:55:40 AM »
findvikas
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Now I need to make sure that both the wire holders (round pieces) move equally and at same pace
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« Reply #5 on: November 10, 2010, 11:08:19 AM »
tg
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Shouldn't a static hot wire cutter and plywood templates on either side of the foam block suffice. You need to select a block of foam thats slightly bigger than the shape you are trying to form and then align and attach the templates to the two ends then run the foam thru the wire length-wise. If the fuse has multiple shapes along its length then make separate sections and attach them together. I doubt you want a cylindrical fuse with a constant section.
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« Reply #6 on: November 10, 2010, 11:16:22 AM »
tg
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Multiple shapes == multiple cross sections (not a constant cross section).
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« Reply #7 on: November 10, 2010, 11:16:24 AM »
allthatido
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Happy is a man whose hobby is his profession
Hi Vikas

What you will generate from the above set up will be frustum. please see the attached pic to add a handlebar (instead of the hand crank)..this will solve your problem of rotating both discs at the same time.

Regards
Ankur
foam cutter.jpg
Re: How to cut cylindrical fuselage out of foam?
* foam cutter.jpg (25.13 KB, 732x457 - viewed 1476 times.)
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« Reply #8 on: November 10, 2010, 11:23:42 AM »
findvikas
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thanks. I was thinking the same... great minds think alike I guess Smiley
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« Reply #9 on: November 10, 2010, 11:24:25 AM »
findvikas
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TG, yes I gave that a thought and trust me it is much easy and smooth when you have full control of both wire as well as foam. I do not like to hold anything in my hand as they shake a lot Smiley
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« Reply #10 on: November 10, 2010, 11:35:42 AM »
tg
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This site is good and explains the exact same thing that you are attempting and the links (those that work) at the bottom of the page are good too -
http://rcfaq.com/ANSWERS/modelbuilding/foamcutting.htm
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« Reply #11 on: November 10, 2010, 11:39:45 AM »
findvikas
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Thanks. I will check that.
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