ABHA Rodin Coil Frame (Phi proportions, 36x36 pattern)

thingiverse

This design caters for winding wire angle changes as it wraps around the frame, eliminating wire bending. It's a 400mm or 16" outside diameter ABHA Rodin coil frame with third-order Phi proportions based on Tom Barnett research to find these proportions. Check out his video at https://youtu.be/kxuU8jYkA1k. I provided files for a 250mm, 10" coil frame too, in case you don't want to build a large one. This design isn't meant for the Daniel Nunez type coil with cross-winding and he calls it the POE Coil. On Tom Barnett's video, the smallest inner toroid is called the first-order coil, and the bigger one is the third-order since it has the Do=outside coil diameter and the Di=inside coil diameter in the proportions Do:Di=Phi^3. As such, it has a 36x36 pattern according to Tom Barnett's suggestion. Phi is the Golden Ratio constant, which is Phi=1.618. See how calculations are done for different order coils in the image above or in the PDF provided in the 'Things Files' section. I updated the PDF document and now includes some sample calculations to show how to design different dimensions and order Phi proportion Rodin coils. The various patterns come from Randy Powell's YouTube channel, which is https://youtu.be/7pvuTZ5u6Kg. You can scale this design, of course, but don't go smaller than Do=200mm or 8", otherwise the ribs/formers get too thin and flimsy. See images how the winding is going around the coil. The colour markings help to see that every 2nd groove has the wire bundle routed through it on the adjacent former. This design has 16 ribs or formers to try to get as close to the correct wire path as possible. This also makes it simpler since the formers are symmetrical all around the ring. Make sure that the tabs on the formers are all facing the same way, as the slot is not in the center due to the cable routing. See video here => https://youtu.be/ohHqAKv_6No. I provided files for a smaller Do=250mm too which is reflected in the file names. Just in case you don't want to build the larger one. The green coil frame built on the photos is the 250mm diameter one, and it can take about 1kg of wire. This one has a bifilar 0.63mm diameter winding wire and creates 2 coils with 8.5 Ohm resistance each. The bifilar winding wire just goes around as long as it runs out so it only has 2 x 2 connections. It took a few hours to wind it on the coil since it went around it about 6 times. I included the 36:36 pattern image which will allow you to build and experiment with different map configurations and sizes while modeling the different order coil vortexes. It can be the basis of other patterns with duplication and overlaying. Just click on the X to enlarge the image, then a link will appear 'View Original'. Click on it and when the image appears right-click on it and save the image to your computer. 3D Printing: I print straight to the print bed without any foundation or support. For this, you need to make sure that your printer sensor is calibrated correctly. I use 5-point print bed calibration. These parts fit on a 200mm x 200mm print bed.