Electromagnet Demispool

thingiverse

This is an electromagnet demispool, half of the hollow spool designed for a two-inch nail electromagnet. To make a snug fitting demispool, adjust the dimensions or skeinforge parameters and check the fit of a two-inch by one-eighth inch diameter common nail. Once you have a snug fitting demispool, create another and insert the nail through both. Thread fine magnet wire through the perforations for support, then wind it around the spool to form an electromagnet. To secure the winding, pass the end of the wire through the perforations. The base and top demispools are identical; in the image, the base is colored yellow and the top is white for distinction. The nail is blue-grey, while the perforations serve as support and mounting holes. Alternatively, use a drill or pipe to wind the electromagnet. The demispool measures one inch high, half the length of the two-inch nail shaft, with a center hole of one-eighth inch diameter. It has a base thickness of 1.2mm (three standard layers) and a spool wall thickness of 2mm. Perforations are 2mm in diameter, spaced 3mm from octagon corners, while the inner radius is 10mm, outer radius 10.82mm, with sides measuring 8.28mm. To adjust dimensions, scale the spool in xy (affects perforation diameter and octagon size) or z (affects demispool height). For intermediate changes without side effects, use the Art of Illusion file provided. Change the nail hole radius, subtract the nail hole from the perforated spool, convert to triangle mesh, simplify, select, and export as electromagnet_demispool.stl.