Woodturning Chuck - Spoons

thingiverse

This was designed, along with my father, to hold a piece of wood securely for turning on a lathe. The plan is to turn a handle and a sphere initially. The sphere will then be mounted into the center of this chuck and held firmly in place with M4x70 bolts and nuts, tightened tightly to grip, with the handle emerging through one of the side cuts. Once mounted onto the lathe using a grip chuck, the sphere can be cut in half and turned out to form a beautiful bowl. Ideally, this should be printed in a strong material like PETG, which will allow some extra give to aid gripping. The chuck is designed to fit a roughly 44mm diameter sphere perfectly. A larger chuck could easily be created for bigger jobs if needed. I printed this in E3D Edge, and I'm looking forward to hearing from my father how well this experiment works out. Update: December 20th, 2017. Finally got around to testing this out with my Dad yesterday. I've switched the 'Work In Progress' flag on because the part failed during initial testing. However, this has allowed me to tweak the design a little and I'll be able to test the re-design again next week. The part broke in two ways: the first break was probably due to not being aware of the forces the part would undergo; the initial spinup of the part creates an enormous shearing force which began to rip the base (held in the metal chuck jaw) away from the main model. Strength can be improved here by printing three solid diaphragm layers on each side of the boundary. The second break came from overtightening, which then caused delamination at the base of the four corner towers. I'll be printing this in flexible material (or maybe ultimately a mix of flexible and other) to prevent this issue from happening again. If you can obtain M4 threaded rod, the knurled nuts are available to simplify the process of tightening the chuck around the spoon blank. Print Settings Notes: Print upside down. The holder part is designed to support the underside of the spoon's globe. You may find it necessary to cut its height by a few mm by pushing it below the surface of the printing bed in your slicing software.