Customizable Cam and Follower Classroom Model - Cam Angle Presets (Educational)
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Customizable plate cam and flat follower for students and teachers: 8 cam angle presets. Untested design study.
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Model information
- Source
- Printables
- Category
- Engineering
- License
- Creative Commons — Attribution — Noncommercial
CUSTOMIZABLE educational model: choose the cam angle (0 to 315 degrees in 45 degree steps) and the follower, crank and lift pointer move to match. Rebuild any preset in the free TrueGeometry Playground with a short paste-in command recipe. The included STL is the 180 degree preset (follower at full 12 mm lift). Made for students and teachers to see how a plate cam and flat follower turn rotation into rise, dwell and fall.
UNTESTED DESIGN STUDY - please read first. This model has not been printed or test-fitted. It is a teaching and display model, not a working mechanism: the cam does not drive anything after printing and the crank does not turn a printed part. The parts are separate overlapping shells, not unioned, so check or repair the mesh in your slicer. The cam is a 72 point polygon that follows a teaching profile, not a calculated production cam. Scale, orientation, supports and material are your decisions.
What you get: a plate cam (base radius 18 mm, lift 12 mm) on a shaft with a hub, a red crank arm and black knob, a flat-faced follower with stem, cap, guide bridge and bushing, and a lift scale with pointer, on a plinth with a back plate. Motion: simple harmonic rise, dwell at the top, simple harmonic fall, dwell at the bottom.
Presets (cam angle, follower lift): 0 deg 0 mm, 45 deg 0 mm, 90 deg 3.09 mm, 135 deg 9.28 mm, 180 deg 12 mm, 225 deg 12 mm, 270 deg 10.2 mm, 315 deg 2.81 mm.
Files:
1. STL, 180 degree preset, native TrueGeometry Playground export: 110 x 137 x 108 mm (X, Y, Z), Y up. 16,644 triangles, closed mesh.
2. Recipe text file: preset table plus the full Playground command recipe (two chunks).
3. How-to-run guide PDF, 5 pages: open Playground, paste the recipe, customize the cam angle, presets table, notes and limits.
How to customize: open the Playground, paste the recipe in two chunks with Script and Run, then reload for a fresh scene and swap in the PRESET lines for the angle you want. See the gallery for the Script panel screenshot and the three-preset view. Step-by-step article with FAQs and tables: https://blog.truegeometry.com/0_0_0_0/blogs/post-c9664edf.html
Checked in Playground: part overlaps were measured and floating parts were fixed. Classroom ideas: read the lift from the scale at two presets, plot lift against cam angle, and compare with the rise-dwell-fall-dwell description.
Built with native Playground commands only: no external scripts and no boolean cuts. AI-assisted design. License CC BY-NC 4.0: share and adapt with credit to TrueGeometry for non-commercial and educational use. Commercial use requires consent from TrueGeometry.