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I seem to recall somewhere in a CP that the recommended cutting wire had been increased from .032" to .04x" did I dream this? Also what is the transformer typically used for this? 12v?, 28 or 48v? Any particular tension and wire temperature we are looking for?

Thanks

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Posted (edited)

https://longezproject.blogspot.com/2011/12/ch-3-foam-cutting-part-4.html

My cutter is just like the one above, black pipes in a 2X4.  I tighten the wire by twisting the pipes with vicegrips and use one of these autotransformers as sold on ebay.  .032 safety wire.  It is possible to get shocked.  I never have and never heard of anyone getting shocked doing this but I wear rubber-soled shoes on a dry floor.  An isolation transformer is nice precaution--it would prevent the shock hazard--but most people don't use one.

Practice on pink styrofoam from the home stores.  It is nearly the same as what we use for aircraft but remove the plastic coating.  I am sure there are youtube videos.  This one is pretty good  https://youtu.be/WgxgcB57n9Y?si=ntsPHns3ysR-0XZL

 

ScreenShot2024-05-10at3_33_41PM.png.471d89643861944578cb770096730e3d.png

Edited by Kent Ashton

-Kent
Cozy IV N13AM-750 hrs, Long-EZ-85 hrs and sold

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Make sure you don’t substitute from the stainless steel safety wire. Here is my saw if you decide to get creative. Just as a starting point the my variac is set at 22 volts. Your setting might vary a bit. IMG_0714.thumb.jpeg.c1a95be33e4a048138a0842c8f6a72cb.jpeg

FZ

Long eze ,  # 712    Chapter and 14,  Chapter 13 and 16 done. 

Cozy Mark 4 # 1777  Chapter 5,  build on hold. 

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1 hour ago, sixfivelrp said:

Make sure you don’t substitute from the stainless steel safety wire.

Nice saw. But Nichrome wire also works great, and usually can be had in thinner diameters for a smaller kerf than the SS. Of course, if you use oversize hot wire templates and then correct size templates for the final sand to shape of the cores, the kerf is immaterial.

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