Parametric Sprocket: Difference between revisions
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*http://www.thingiverse.com/thing:87647/#files - has a good 15 tooth example - Bike Sprocket | *http://www.thingiverse.com/thing:87647/#files - has a good 15 tooth example - Bike Sprocket | ||
*The above was derived from http://www.thingiverse.com/thing:7918 | *The above was derived from http://www.thingiverse.com/thing:7918 | ||
=How to Design a Sprocket for Bulldozer Drive= | |||
*The sprocket generator in OpenSCAD creates a proportionally correct sprocket. | |||
*How do we know how to scale it to match our specific case? | |||
*We note that the pin spacing on our track is 3" | |||
*We note that the roller OD is 2.2" | |||
*The parameters we have control of are: | |||
:*the number of teeth, | |||
:*spacing between the rollers | |||
=Bulldozer 2015 Usage= | =Bulldozer 2015 Usage= | ||
{{Hint|The bulldozer from 2015 used an 8 tooth sprocket, generated with sprocket(8,5,7.5,2,0.2); in the last line of the Editor}} | {{Hint|The bulldozer from 2015 used an 8 tooth sprocket, generated with sprocket(8,5,7.5,2,0.2); in the last line of the Editor}} | ||
| Line 13: | Line 20: | ||
:*Note: original srocket was generated using [[Parametric Sprocket Generator]] using sprocket(12,5,7.5,8,0.2); | :*Note: original srocket was generated using [[Parametric Sprocket Generator]] using sprocket(12,5,7.5,8,0.2); | ||
=Links= | |||
*Sprocket geometry for a correct sprocket pitch and roller diameter - example - [[File:sprocketgeo.dxf]] | |||
:*Uses [[Sprocket Generator]] | |||
[[Image:dxfexportex.jpg|400px]] | [[Image:dxfexportex.jpg|400px]] | ||
Revision as of 05:28, 20 October 2017
- http://www.thingiverse.com/thing:87647/#files - has a good 15 tooth example - Bike Sprocket
- The above was derived from http://www.thingiverse.com/thing:7918
How to Design a Sprocket for Bulldozer Drive
- The sprocket generator in OpenSCAD creates a proportionally correct sprocket.
- How do we know how to scale it to match our specific case?
- We note that the pin spacing on our track is 3"
- We note that the roller OD is 2.2"
- The parameters we have control of are:
- the number of teeth,
- spacing between the rollers
Bulldozer 2015 Usage
Hint: The bulldozer from 2015 used an 8 tooth sprocket, generated with sprocket(8,5,7.5,2,0.2); in the last line of the Editor
Exporting DXFs from 3D Objects in OpenSCAD
- Exporting DXFs - [1] - essentially - load and flatten, then export DXF
- Note: stock Export DXF does not work for 3D files - they need to be projected first.
- To project - projection(cut=false) import("sprocket.stl"); STL file must exist in same directory
- Sample file for exercise in OpenSCAD - the sprocket STL and the .scad file that loads the STL and does a 2D projection. Note that the directory must be correct. File:Sprocketexample.zip
- Note: original srocket was generated using Parametric Sprocket Generator using sprocket(12,5,7.5,8,0.2);
Links
- Sprocket geometry for a correct sprocket pitch and roller diameter - example - File:Sprocketgeo.dxf
- Uses Sprocket Generator
