Electromagnetic coil winding core

Some time ago, my child said he wanted to make a coilgun, so I let him research it first and then explain it to me The motivation was indeed different Based on the information he found, we started making it, either buying a ready-made circuit board or designing one ourselves I felt we wouldn't learn much by buying one, so I designed the circuit board with my child, skill +1 I also saw that better coilgun coils sold online were around 15 yuan The main reason was still to let the child learn electromagnetic principles, so we learned how to wind coils together, and this project was born The coil core dimensions are 28*20*8mm, an acrylic tube with an outer diameter of 8mm can pass through the middle Before winding, the two parts need to be glued together If you want your child to participate in hands-on projects, please follow me and give me a boost Friends who boost me can contact me privately for the coilgun making process, not the laboratory type