Lathe thread dial

thingiverse

A Threading Dial for Small Lathes. The threading dial is what insures that the part and the carriage are synced up so you enter the same groove each time. The bracket fits a polish TSB16 lathe, but the mounting point fits a M4 screw, so you can design your own. The gear is designed for a metric trapezoidal lead screw with the diameter of 24mm, pitch 3mm, and 30° thread angle. It has 20 teeth. Post-Printing The face of the dial was supposed to have letters, but they were too small to print, so I sanded it on the lathe and used a correction fluid to make the markings. It requires two 608 bearings and a 50 mm piece of 8 mm rod. How to Design a Custom Gear This is the tool to get the dimensions for your gear: https://www.khkgears.co.jp/GDSW/WormDraw.do?method=trans&step=New&lang=en Unfortunately, you have to log in to use it, but the logins on bugmenot also work: http://bugmenot.com/view/khkgears.co.jp I suggest using this calculator for thread dials to figure out the number of teeth you need: https://www.cgtk.co.uk/metalwork/calculators/threaddialindicator ###Steps in Fusion 360: 1. The first step is to generate the normal spur gear, but it only generates module gears, so you need to divide the pitch by Pi and put it into the "Module" field, eg. for 3mm pitch the "module" is 0.955, for 2 mm it's 0.637. The number of teeth needs to match the gear you want to create. 2. Then you need to extract the involute profile from the sketch of the spur gear. 3. You need to revolve the main shape of the gear with the dimension from the website. 4. Create a "Plane at Angle" with the angle of the teeth. 5. Project the shape of the revolve on the sketch on the plane from point 4. This is the path to sweep the tooth profile. 6. Sweep a single tooth from point 2 creating a new body. 7. Use a circular pattern to create multiple teeth. 8. Use Combine with "intersect" on the teeth and the main profile. 9. With a revolute create the "inside" of the gear. 10. Break the edges of the teeth to match the profile from the website.