Longworth Chuck

thingiverse

Customizable Longworth Chuck for Wood Lathes: It is designed in OpenSCAD for complete control over variables and the ability to export to DXF for CNC, laser cut, or template making. v4 - Fixed spiral width for bolts (chuck jaws), added animate feature v3 - Added adapter mounting holes Adapter Hole Settings: adapterhole = Size of hole for adapter adapterholenum = Number of holes - enter 0 for none adapterholedist = Hole distance from center adapterholeangle = Change the rotation of the holes to suit your needs Variable Explanations (every length is inches): chuckdia = Diameter of the entire longworth chuck chuckthick = If you are going to CNC/laser, this will help determine thickness of stock adapterdia = Adapter for the chuck to the lathe offsetedge = Distance from the edge to the outer rim of the arc centerholedia = Center hole for axle of chuck washerthick = If you are using a washer this may come into play boltdia = Bolts size for the chuck jaws numberarcs = How many spirals or jaws arcangle = Maximum of 90 - adjust this for odd chuckdia numberholes = Number of finger holes fingerholedia = Diameter of the finger hole fingerrotate = If you need to adjust the finger hole placement coinciding with the number of arcs res = Resolution of arcs and circles This project was done in 2016.10.30.nightly to process the correct rotate_extrude function. This model can also be built with 3 modules that only have the arcs, include fingerholes, and include a seat for the chuck adapter with fingerholes. I used the lathe chuck adapter I made on OpenSCAD as well to mount to the lathe itself: http://www.thingiverse.com/thing:1860359 Exporting... Once you like your design, make sure to File>Export>Export As STL. Create a new OpenSCAD file or open the OpenSCAD DXF Export.scad file and find the path of your STL. You can use projection to cut a layer and then Export to DXF and open in your favorite CAD or vector program. Preparing DXF File>Export>Export As DXF Opening your model in a vector drawing program or CAD software Animated version to show functionality of chuck Gluing pieces together with spindle adapter. Nut is embedded within the layers. Using a threaded nut insert for the piece attached to the adapter. I used epoxy to seal the threaded nut in place. The center hole in this set is slightly larger than the outer pieces of the chuck in order to accept the insert. The bolts attaching the lathe adapter are flat pan head and I countersunk the chuck holes by hand. Added 2 coats of varnish for protection after sanding...