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Diy CNC 4 axis hot wire cutter

thenated0g

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Since i got my windyhillhobbies cnc my old diy has just been collecting dust. So i decided to convert it over to arduino control and use devcad's CAM like i have been loving on the windyhill setup. This did require me to purchase external drivers, new PSU, and a MKS Gen L v2 board for about $120 but will make it usable for things i just cannot do on my other cnc.
PXL_20201210_052758263.jpg

I have had a problem for years where i couldn't do sharp sweep. Its simply the geometry of having a square table. You are only going to get close to a 45 degree cut. This new configuration will be about 28"x6" wide, so a tall rectangle. This will allow drastically more sweep.
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So this will not only allow me to get some really swept wing and some really pointy noses on fuselages, but it will also set me up to use devcad's devfuse foam software. This takes a 3d model of a fuselage and slices it up into whatever thickness of foam you have.
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thenated0g

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Cut out v1 (cardboard test) of my "arms" i am designing for the Bow hanger. I am copying the setup from the windyhill cnc setup which is essentially 2 parts. The top part is a hanger for the rigid top part of the bow to hang and slide on as the towers move apart. The bottom part is a rigid location for a brass eye that holds the hot wire in its location and also allows it to slide as the towers move.

Another issue this is dealing with is that the neutral/home location of my old towers was a couple inches off the table so i had to elevate my foam. This arm design gets it down very close to the table.

***oh yeah the other major issue i was dealing with on this design was that at the extreme angles the bow will get on this configuration i needed to get the pivot points much farther away from the towers so the bow and towers dont interfere with each other.
311156_104593c4cc29892c47f0873c5dbbe610.jpgPXL_20201222_015116785.jpgPXL_20201222_015124274.jpg
 
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