Parametric Knob
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Published on February 7, 2011
This thing was Featured on February 7, 2011
Description
I lost the knob for a random consumer electronics thing, and I thought I'd print a new one - well, you know how one thing leads to another, usually an SCAD script, in my case.
This is a snap-on knob for a shaft with a flat - there's an internal stress-relieving slot that helps the thing absorb the strain of pushing it onto the shaft.
This is a snap-on knob for a shaft with a flat - there's an internal stress-relieving slot that helps the thing absorb the strain of pushing it onto the shaft.
Instructions
Measure the shaft you want to slide this on - my shaft had two portions, with slightly different diameters. The flat is on the top half (!). The awkward +0.5's are a way of compensating for my Makerbot's printing holes smaller than I'd like. (But see thingiverse.com/thing:6118 and assorted blog post hydraraptor.blogspot.com/2011/02/polyholes.html)
Measure or calculate or guess the height of the knurled section you want (this is the bit you hold with your fingers).
Decorate the bottom, if you wish, with a skirt.
For real added credibility, add a dome on the top. Don't be excessive.
Enter the parameters to the beginning of the script, run it, and print the resulting stl.
Have fun!
Measure or calculate or guess the height of the knurled section you want (this is the bit you hold with your fingers).
Decorate the bottom, if you wish, with a skirt.
For real added credibility, add a dome on the top. Don't be excessive.
Enter the parameters to the beginning of the script, run it, and print the resulting stl.
Have fun!
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