Update machine_building_parts_list.md

docs/Instruction/tips/machine_building_parts_list.md

@@ -13,7 +13,7 @@ heat-set inserts
 T-Slotted Framing Rails
  -  [Misumi frame 2020 L=300]((https://jp.misumi-ec.com/vona2/detail/110302683830/?list=PageCategory))
 
- ## Drive
+## Drive
  - [Timming belt GT2](https://ja.aliexpress.com/item/32546490272.html?gatewayAdapt=glo2jpn&spm=a2g0o.order_list.0.0.21ef585a66UU94)
     - [Velt tensioner spring](https://ja.aliexpress.com/item/32903348346.html?gatewayAdapt=glo2jpn&spm=a2g0o.order_list.0.0.21ef585a66UU94)
 - Shaft
@@ -24,8 +24,11 @@ T-Slotted Framing Rails
 - slides
 
 
+## Pully
 
-
+- 
+- Ref. [Urumbu](https://gitlab.cba.mit.edu/neilg/urumbu)
+- Ref. [UrumbotXY](https://gitlab.cba.mit.edu/neilg/urumbu/-/tree/master/UrumbotXY) 
 
 
 
@@ -34,6 +37,19 @@ T-Slotted Framing Rails
 
 ## Electronic components
 
+## Stepper Motor
+
+- [42HD4002-24B](https://akizukidenshi.com/catalog/g/gP-14604/)
+
+## Geared Motor -> need to buy
+
+- [DC 12V 550RPM Gear Motor High Torque](www.amazon.co.jp/dp/B072R5G5GR)
+
+## Rotary Encoder -> need to buy
+
+- [600P/R Incremental Rotary Encoder DC5-24V](www.amazon.co.jp/dp/B08H4MSWT4)
+- Ref. [ZIPY Inverted Pendulum Yakshave](https://hackaday.io/project/158289-zipy-zipy-inverted-pendulum-yakshave)
+
 ### Motor Driver
 
 #### Modules