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Parameterized Star Knob for tool

by Hank-Cowdog Feb 3, 2015
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do you have the STL file for the 1/4 inch size please? thx:)

The Customizer is set up for 1/4" bolts. You can make an STL, setting the diameter, number of finger points, etc. by clicking on the "Open in Customizer" link, then either accepting the defaults or tuning them to your requirements.

When things look the way you like, click on the "Create Thing" link in the upper right and the custom STL will be created. You can optionally ""Publish New Thing" it when creating the STL to make it visible to all (I recommend NOT doing so unless you are targeting a specific application and want to make the STL available to others).

I'm wanting to use your knob in a remix that also uses (indirectly, shapes as inspiration) some Creative Commons ideas. As your knob code is under GPL V2, do you need my final work to be under GPL V2? I intend to include <> your code unmodified (complete with headers) and just override some variables. I'll leave all headers intact and credit all sources of code/inspiration.

I can split my source and publish under two licences, but Thingiverse seems to want everything under one licence.


Thanks for asking.

Since my part was in turn a remix of "fastryan's" Tension Knob (https://www.thingiverse.com/thing:27502) which is under the same GPL V2 license, I'd have to ask you to abide by it as well.

Tension Knob

OK, understood. I've split it off into a different file and will probably have to put it on Thingiverse as a separate thing as license is different. It's a good job the thread library was under a permissive licence or things would be even more complicated!

Excellent design and thanks for sharing!
The only thing I don't understand is how to set the size of the nut you want to capture in Customizer?

The Customizer version ONLY works for 1/4" bolts (pretty common for use as hold-downs in jigs). I did that to simplify the Customizer interface somewhat.

If you want to use a larger (or smaller) diameter bolt, you'll need to download OpenSCAD and grab a copy of the source code for the part.

You'd then need to change this line:

//Diameter of the shaft thru-bolt, in mm
ShaftDiameter = 25.4/4;

For a 3/8" bolt, for example, it would become:

ShaftDiameter = 25.4*(3/8);

If desiring a metric bolt, just specify the size in mm. For an M6 (6mm) bolt:

ShaftDiameter = 6;

Thank you. Excellent scad. I have found it very useful for making my own clamps. Kudos.

Glad you like it. Even though I made this design a while ago, I still use it (as recently as last Thursday) to make knobs for woodworking jigs, etc.

what does parameterized mean?

Parameterized means that parameters control most aspects of the design: rather than a single knob, you can tweak the parameters and make any of dozens (hundreds?) of different knobs to meet your needs. Diameter, height, number of "fingers" on the knob, etc. can all be adjusted quickly and easily.

Some things can be changed in Customizer, but the shaft diameter (for example) is locked so as to simplify the Customizer interface for the part. To take FULL advantage, download a copy of OpenSCAD (it's free) and the sourcecode for the knob. Read to top 20 lines or so, tweak something, hit F5 in OpenSCAD, and see how the model changes.