Added Mechanical Parts folder with subfolders and a few parts

Mechanical Parts/Bearings/608ZZ_Ball_Bearing.step

@@ -0,0 +1,921 @@
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+FILE_NAME('/home/normand/Dessins/RepRap/Vitamins/608ZZ_bearing.step',
+  '2013-07-28T21:07:01',('FreeCAD'),('FreeCAD'),
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+FILE_SCHEMA(('AUTOMOTIVE_DESIGN_CC2 { 1 2 10303 214 -1 1 5 4 }'));
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Mechanical Parts/Fasteners/Bolts & Screws/README.md

@@ -0,0 +1,10 @@
+FreeCAD-library/Mechanical Parts/Fasteners/Bolts & Screws
+=======================================================
+
+This repository contains a library of bolts and screws to be used in FreeCAD. See the main repository for more information.
+
+In most CAD systems, screw threads are never modelled because rendering many threaded screws in the same document would be too CPU intensive and would serve no purpose. These screws are intended to be used in assemblies and as such they are represented as cylindrical, with the nominal screw size as their outer diameter.
+
+Fully modelled threaded bolts and screws may be uploaded into this repository but should have "_FT" (for fully threaded) appended to their filename to identify them.
+
+The "Metric" folder contains metric screws while the "Unified" folder contains screws based on the [Unified Thread Standard (UTS)] (http://en.wikipedia.org/wiki/Unified_Thread_Standard).

Mechanical Parts/Fasteners/Bolts & Screws/README.md~

@@ -0,0 +1,10 @@
+FreeCAD-library/Mechanical Parts/Fasteners/Bolts & Screws
+=======================================================
+
+This repository contains a library of bolts and screws to be used by FreeCAD.
+
+In most CAD systems, screw threads are never modelled because rendering many threaded screws in the same document would be too CPU intensive and would serve no purpose. These screws are intended to be used in assemblies and as such they are represented as cylindrical, with the nominal screw size as their outer diameter.
+
+Fully modelled threaded bolts and screws may be uploaded into this repository but should have "_FT" (for fully threaded) appended to their filename.
+
+The "Metric" folder contains metric screws while the "Unified" folder contains screws based on the [Unified Thread Standard (UTS)] (http://en.wikipedia.org/wiki/Unified_Thread_Standard).

Mechanical Parts/Fasteners/Nuts/README.md

@@ -0,0 +1,10 @@
+FreeCAD-library/Mechanical Parts/Fasteners/Nuts
+===============================================
+
+This repository contains a library of nuts to be used in FreeCAD. See the main repository for more information.
+
+In most CAD systems, screw threads are never modelled because rendering many threaded screws would be too CPU intensive and would serve no purpose. These nuts are intended to be used in assemblies and as such their holes are represented as cylindrical, with the nominal screw size as their inner diameter.
+
+Fully modelled threaded nuts may be uploaded into this repository but should have "_FT" (for fully threaded) appended to their filename to identify them.
+
+The "Metric" folder contains metric nuts while the "Unified" folder contains nuts based on the [Unified Thread Standard (UTS)] (http://en.wikipedia.org/wiki/Unified_Thread_Standard).

Mechanical Parts/Fasteners/Nuts/README.md~

@@ -0,0 +1,10 @@
+FreeCAD-library/Mechanical Parts/Fasteners/Nuts
+===============================================
+
+This repository contains a library of nuts to be used by FreeCAD.
+
+In most CAD systems, screw threads are never modelled because rendering many threaded screws would be too CPU intensive and would serve no purpose. These parts are intended to be used in assemblies and as such their holes are represented as cylindrical, with the nominal screw size as their outer diameter.
+
+Fully modelled threaded nuts may be uploaded into this repository but should have "_fully-threaded" appended to their filename.
+
+The "Metric" folder contains metric nuts while the "Unified" folder contains nuts based on the [Unified Thread Standard (UTS)] (http://en.wikipedia.org/wiki/Unified_Thread_Standard).

Mechanical Parts/Fasteners/Washers/Metric/DIN 125 class 4 M8 Flat Washer.step

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