Youth Compound Bow

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Compound Bow for Youngsters (8-12) Draw weight: 17-33lbs Draw length: 21-23 inches Limb material: Schedule 40 PVC pipe (1.25 inch) Limbs created from Schedule 40 PVC Pipe Instructions Make the Compound Bow: Study the parasolid or STL assembly file to understand the assembly. Riser: Mill the riser from 15mm Plexiglass (Acrylic/Perspex) I have included the nested parts in the 'Milling layout no islands 2.STL' file. The riser's limb pocket and limb bolt holes should be carefully drilled by hand after milling. Ensure the M8 Nyloc nut fits into each end of the milled slot, with the 8.5mm hole drilled for the M8 bolt aligning perfectly with the nut and hole in the limb pocket. Once the drilling is done, apply CA glue to join the riser sections together, making sure to match up the 3mm dowel holes. The finished product can be sanded down and painted if desired. Hole spacing: Holes for standard bow sights and Gerber bolts for a standard bow rest are included in the design. Cams: Use ABS/Polycarbonate 3D printing for cams, or mill them from Polycarbonate using a uPrint. For less expensive printing, use polycarbonate with hand cut cable grooves. Parallel cam system as used in G5 Prime bows keeps the cams steady and works well for leaning them into PVC pipes. Fasteners: Cam bolts are held together by M3x12 Socket head cap screws. The limb bolt uses an M8 x 40 SHCS and M4 countersunk screws hold the limbs in place. Use 4mm ID x 11mm OD x 4mm Wide bearings on either side of the limbs for a snug fit. Limbs: Limbs made from Schedule 40 PVC pipe (1.25 inch) are heated and shaped using a heat gun for an optimal curve, making them look professional. The process is very straightforward because there is no complicated work or need to worry about damaging other materials. Stringing: The compound bow has its strings tied using a high-quality nylon rope. For easier operation the bow will also have some small details. I will add those later. To put this on your table, we first made it by applying nylon string that has 1.5 mm width, while you will get more options with these two types of material which were not only less cost-effective but gave us high durability to a certain degree. To assemble and prepare it for shooting all we need is make sure all limbs are securely fastened into position. This will help give maximum force transfer at draw full length and avoid over twisting, which may weaken limbs when released quickly after firing arrow off target, giving an opportunity at achieving perfect form throughout every step needed!