tourniquet parts FreeCAD models initial release

[0penBrain]

Hi. Following @tareko call for collaboration on otoscope, I found the tourniquet a nice exercise to model in FreeCAD. :)
I guess the interesting part of doing is to increase openness and hacking possibility of parts to a wider range of people.

So in this PR is an initial release with following assessments/limitations/remarks :

General :

• All parts are modeled with a parametric approach using PartDesign workbench of FreeCAD
• Try to stick as close as possible to original part
• As stable/robust/hackable modeling as possible

anchor_holder :

• Nothing special to say about :)

anchor_rod :

• Central shape has been produced by an arc of ellipse. I think this is conform to original shape
• There was an "unnatural" shape (some parallelepiped substraction) around central slot at its outside. I replaced that with a chamfer guessing it was the expected function. Hope this is correct. ;)

slice :

• Nothing special to say about :)

buckle/wide_buckle :

• Top text isn't fine tuned. On the (small) buckle, I can't reproduce the exact same text despite I used the same font. On the wide buckle, ATM I kept same text as for the small buckle.
• I can't "mathematically" center the text because FreeCAD crashes when trying to use expressions to do so. ATM, it is "manually" centered using placement of the 'ShapeString' object.
• FreeCAD doesn't support ATM embedded or relative-path font. So if text modification is needed, font path shall be set in the 'Font File' property of the 'ShapeString' object.
• Font is pushed in this PR in the 'assets' folder
• At the bottom of the small buckle, there was a small material "tooth". It looks to me as a modeling glitch to I removed it, but maybe I'm wrong. :)
• On both buckles, the gripping pattern wasn't centered. I guessed it wasn't for any particular purpose so I centered it. But maybe I'm wrong again. :)

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Notice these files haven't been reviewed in any way. So if you're interested in using them, you should check them.
Anyway feel free to remark/modify/request for changes. ;)

HTH

[tareko]

Hi 0penBrain!

Thank you for such incredible work. This is absolutely a valuable contribution to the project.

I am conflicted about what to do at this point. We hadn't requested CAD assistance because we have OpenSCAD files. However, the files are great and I think we should leave them here. I'll have the Gaza team (who made the original files) take a look and we'll discuss the best way forward during our weekly team meeting tomorrow.

tarek : )

[darigovresearch]

@tareko did you manage to speak to the team to discuss what to do with @0penBrain 's pull request?