mechanism part documentation

.gitignore

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+.DS_Store
+*.pyc
+.vscode/

README.md

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 # hexapod-v2-7697
-Hexapod v2 using Linkit 7697
+
+Hexapod v2 using Linkit 7697 (Still under construction)
+
+![Hexapod](files/hexapod.jpg)
+
+* [Mechanism](mechanism/README.md)
+* Electronic (TBD) 
+* Software (TBD)

mechanism/README.md

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+# Mechanism
+
+![Body](files/mech_body.png)
+
+## Bill of Materials
+
+### Servo
+
+Servo is the key component. I use TowerPro [MG92B](http://www.towerpro.com.tw/product/mg92b/). It has metal gear (important!).
+An hexapod requires 18 of them.
+
+Note.
+The dimension of 3d printed part is highly depended on servo's dimension.
+Modification is required if you want to use other alternative servo. 
+
+Note. 
+TowerPro MG92B can be found on Ebay seller [servohorns959](https://www.ebay.com/usr/servohorns959), which is listed on TowerPro official website ([Link](http://www.towerpro.com.tw/about-us-2/)). I also got mime servo from him.
+
+
+### 3D-Printed
+
+#### Body x 1
+
+Filename | Thumbnail | Required |
+-------- | --------- | -------- |
+body_top | | 1 |
+body_bottom | | 1 |
+body_center | | 1 |
+body_side_wall | | 4 |
+body_back_wall | | 1 |
+
+#### Leg x 6
+
+Filename | Thumbnail | Required |
+-------- | --------- | -------- |
+thigh_top | | 1 x 6 |
+thigh_bottom | | 1 x 6 |
+joint_center | | 1 x 6 |
+joint_top | | 2 x 6 |
+joint_bottom | | 2 x 6 |
+leg_top | | 1 x 6 |
+let_bottom | | 1 x 6 |
+foot_top | | 1 x 6 |
+foot_bottom | | 1 x 6 |
+foot_ground | | 1 x 6 |
+
+#### Tools
+Filename | Thumbnail | Required |
+-------- | --------- | -------- |
+tools_mount | | 1 
+
+### Others
+
+Name | Spec | Thumbnail | Required |
+---- | ---- | --------- | -------- |
+Screw | M2 6mm | | |
+Screw | M2 30mm | | 36 |
+Nuts | M2 | | 36 |
+Bearing | 8x4x3 mm | | 18 |
+Cooper/Aluminum Tube | 6 (height) x 4 (dia.) | | 18 |