Thingiverse
Continuous rotary to intermittent rotary via a Reuleaux triangle by mgg942
by Thingiverse
Last crawled date: 4 years, 7 months ago
This is basically a re-design for 3D printing of the mechanism posted on GrabCad here: https://grabcad.com/library/reuleaux-triangle-intermittent-mechanism-1
Based on a (modified) Reuleaux triangle (see: https://en.wikipedia.org/wiki/Reuleaux_triangle#Rotation_within_a_square) the mechanism converts continues rotary motion to intermittent rotary motion. The Reuleaux triangle providing movement to and from the gear-to-be-rotated and the rotation of that gear. Very neat, I reckon.
Designed in Moment of Inspiration (Moi), simulated in SimLab Composer Mechanical and printed in Diamond Age PLA on an Ultimaker original.
Note that included in the stl files is an optional part Reuleaux rotor spacer. You may not need to use this if you can print everything flat enough. I found that I could fully tighten all 'keeper' screws, but not the screws retaining the handle lever. In the photos and video I've spaced the handle lever out with stainless steels washers, but they are fiddly to fit so I subsequently designed the aforementioned spacer.
Note also that the posted stl files differ slightly from the model that I printed. I've changed the hub keeper set up from 3 screws to one screw, and added 3 more holes in the base to accommodate a wider range of rubber bands.
Hardware required:
1 longish rubber band
3mm x 10mm long button head cap screws. At least 11 with a maximum of 16.
A video of the model 'in action' is here: https://youtu.be/_lvGsT3ATXw
A simulation is here: https://youtu.be/HkxusRPVYAA
A 3D pdf file in which you can rotate the model to any attitude and then run it is included in the files.
Based on a (modified) Reuleaux triangle (see: https://en.wikipedia.org/wiki/Reuleaux_triangle#Rotation_within_a_square) the mechanism converts continues rotary motion to intermittent rotary motion. The Reuleaux triangle providing movement to and from the gear-to-be-rotated and the rotation of that gear. Very neat, I reckon.
Designed in Moment of Inspiration (Moi), simulated in SimLab Composer Mechanical and printed in Diamond Age PLA on an Ultimaker original.
Note that included in the stl files is an optional part Reuleaux rotor spacer. You may not need to use this if you can print everything flat enough. I found that I could fully tighten all 'keeper' screws, but not the screws retaining the handle lever. In the photos and video I've spaced the handle lever out with stainless steels washers, but they are fiddly to fit so I subsequently designed the aforementioned spacer.
Note also that the posted stl files differ slightly from the model that I printed. I've changed the hub keeper set up from 3 screws to one screw, and added 3 more holes in the base to accommodate a wider range of rubber bands.
Hardware required:
1 longish rubber band
3mm x 10mm long button head cap screws. At least 11 with a maximum of 16.
A video of the model 'in action' is here: https://youtu.be/_lvGsT3ATXw
A simulation is here: https://youtu.be/HkxusRPVYAA
A 3D pdf file in which you can rotate the model to any attitude and then run it is included in the files.