im build a project and i need some help build one because i have to have a marble roll down it but i dont know how any suggestions will help
Go to a handyman store, or equivalentGet an aluminum tube that has an inside diameter just a bit greater than the diameter of your marbles - and having a thin wallGet a long tube - 6 or seven feet long (approx 2m or more)Get a cylindrical piece of wood, about 6 to 8 inches (15cm to 20cm) diameter and at least 8 inches (20cm) longGet two attachment clamps, omega shaped as used to screw-on that aluminum tube to a wallGet four screws to screw the two clamps to the wooden cylinderGet about half a gallon (2 liters) of fine dry sand and fill the aluminum tube and tape the ends that the sand does not run offUse the two clamps to screw-on the tube one inch from its end to the cylindrical (round) surface of the wooden cylinder near on end of the cylinderAttach the clamps about one inch or less apart from each other so that the tube points tangentially from the cylinderNow fix the free end of the wooden cylinder somewhere so that you can apply force to wind the sand-filled tube around the cylinder in a helical way (screw-like)Note: The sand filling is to avoid collapsing of the tube while winding it aroundWhen you have done your work in winding (approx 3 to 5 turns) you unscrew the two fasteners from the wooden cylinder, you remove the tape from the ends of the tube and you empty the sandRinse the inside of the tube with water and blow it dry with the suction of a vacuum cleanerYou may use the two clamps to fix your helix to the structure of your project.
