Wrench/spanner to work on the 'bottom bracket' , 16 notch
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###This is a wrench/spanner to work on the 'bottom bracket' of a bicycle.
The bottom bracket is the axis your two cranks are mounted to.
A commercial version of such a tool often used are the Park Tool.
This is one of those tools you use once every decade or so.
The only measurement I could not confirm was the notch diameter.
So I uploaded 2 versions which have a different notch radius of 1.95mm and 2mm.
I printed and tested the 2mm version which worked but was tight.
Note that the max. torque of a 3D printed wrench is limited , So choose thick walls and strong infill.
Also make sure your 3D printer is calibrated.
The wrench can be printed on a small bed 3D printer like the Ender3's
The distance between the eyelet and the tools torque-center is 0.1689 meter so you can calculate a force for a desired torque.
So to get a 5 Nm torque , you must apply 29.6 Newton or ~ 3.02 kg
I could not find any 2D drawings or official specifications but I believe the mayor dimensions are :
-Outer diameter : 45 mm
-Inner diameter : 42.7 mm
-Notch radius : 2 mm
If you know of official specifications or drawings please send me a mesg.
