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Post  akjgardner Sun Jun 11, 2023 11:36 am

Home Made Foam cutter C0a8fc10 don’t know if it’s going to work or not, I need to find a DC Power Supply . I used an adjustable shelf piece so I can easily change the size of the cutter
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Post  944_Jim Sun Jun 11, 2023 5:00 pm

That's great looking AK. I like the "self-tensioner."

Oh Jerry....where are you?
Jerry built a micro foam cutter for making his Typhoon wings. I think I saw the video on Facebook. I doubt it was over 10 inches across. After all, Typhoon wing panels are only about 6.5 inches (four sections in total).

I seem to remember he used an N-scale model train transformer to power his. A quick eBay shows the bottom entry at about $13...but I'd stay away from N-scale transformers based on the size of your particular "unit." If I had an HO one, I'd send it just to see if it could power yours.

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Never enough time to build them all...always enough time to smash them all!
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Post  Jerry Sun Jun 11, 2023 7:40 pm

I used an MRC Throttle pack… an HO transformer…   I hooked the foam cutter to the track leads so the rheostat could be used to adjust the current.
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Post  andrew Sun Jun 11, 2023 11:07 pm

Here are pics of my bow and associated power supply.  I use a commercial DC power supply rated at 13.8v driving a DIY PWM heat controller.  The cutting wire is .018 stainless spring steel.  When cutting cores, I use a spreader about 3" inches up from the wire to insure the wire remains very taut -- the end spring takes up any stretch as the wire heats up.

There are several AC hot wire designs on the interweb, but I've found that AC can sometimes set up harmonics in the wire that causes a wavy surface cut.

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Post  Oldenginerod Mon Jun 12, 2023 1:08 am

We had someone sign up a couple of years back who was making foam cutters and offering them commercially. I don't recall the name.
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Post  getback Mon Jun 12, 2023 7:28 am

Here it is Rod > https://www.coxengineforum.com/t14602-precision-foam-cutting-bows-titanium-wire-adjustable-tension?highlight=making+foam+cutters Nice looking set up starting to come together there Joe . Andrew, you got it going on sure it does a good job for you . This Site Rocks!
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