add more BOM images

mechanism/README.md

@@ -4,58 +4,12 @@
 
 ## Bill of Materials
 
-### Servo
+[BOM](BOM.md)
 
-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.
+## Leg Assemble
 
 
-### 3D-Printed
 
-#### Body x 1
 
-Filename | Thumbnail | Required |
--------- | --------- | -------- |
-body_top | ![body_top](files/body_top.jpg) | 1 |
-body_bottom | ![body_bottom](files/body_bottom.jpg) | 1 |
-body_center | ![body_center](files/body_center.jpg) | 1 |
-body_side_wall | | 4 |
-body_back_wall | ![body_back_wall](files/body_back_wall.jpg) | 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 | Note
----- | ---- | --------- | -------- | ----
-Screw | M2 6mm | ![6mm](files/M2_6mm.JPG) | 54 | Servo Arm: 1 x 18<br>Joint: 4 x 6<br>Thigh: 2 x 6
-Screw | M2 12 or 10mm | ![10mm](files/M2_10mm.JPG) | 6 | Thigh: 1 x 6
-Screw | M2 30mm | ![30mm](files/M2_30mm.JPG) | 36 | Servo: 2 x 18
-Nuts | M2 | ![6mm](files/M2_nut.JPG) | 36 | Servo: 2 x 18
-Bearing | 8x4x3 mm | ![bearing](files/bearing.JPG) | 18 | Servo: 1 x 18
-Cooper/Aluminum Tube | 6 (height) x 4 (dia.) | ![tube](files/tube_6x4mm.JPG) | 18 | Servo: 1 x 18
+## Body Assemble