Cheaper Parts can be found in other places: Nema 14 Stepper Motor (Total needed 3) http://www.omc-stepperonline.com/9deg-round-stepper-motor-065a-12ncm17ozin-14hr080654s-p-87.html 5 Pcs SCS8UU 8mm Linear Motion Ball Bearing (Total needed 10) http://www.amazon.com/SCS8UU-Linear-Motion-Bearing-Bushing/dp/B015II7U06/ref=sr_1_10 skate bearings (Total needed 4) (1 is for small brushless motor only) http://www.amazon.com/Bearing-Shielded-8x22x7-Miniature-Bearings/dp/B002BBICBK/ref=sr_1_7 T8 Brass 8mm diameter 2mm pich Flange(Total needed 3 but 1 comes with the lead screw) http://www.amazon.com/Brass-Flange-Trapezoidal-Bronze-Printer/dp/B00V4LPBEO/ref=sr_1_1 T8 500mm length 8mm diameter Lead Screw (Total needed 1, needs to be cut in to 3 pieces) http://www.amazon.com/L500mm-Stainless-Steel-Screw-Printer/dp/B00PXJ6GD8/ref=sr_1_3 500mm length 8mm diameter Liner Rail (Total needed 2, each needs to be cut in to 3 pieces) http://www.amazon.com/DN-Cylinder-Linear-Optical-Rust-proof/dp/B00U28TTIY/ref=sr_1_2 power button (16mm) (Shut down RPI) http://www.amazon.com/Amico-stainless-Momentary-Button-Switch/dp/B007Q84RDU/ref=sr_1_16 E-stop button (16mm) http://www.amazon.com/Amico-Angel-Momentary-Button-Switch/dp/B00MFJX5BU/ref=sr_1_1 oled 0.96" I2c 128x64 screen http://www.amazon.com/Solu-128x64-Display-Module-Arduino/dp/B00U5QL6JI/ref=sr_1_32 5-way Navigation switch https://www.adafruit.com/products/504 raspberry pi raspberry pi wireless http://www.amazon.com/Edimax-EW-7811Un-150Mbps-Raspberry-Supports/dp/B003MTTJOY/ref=sr_1_1?ie=UTF8&qid=1440560163&sr=8-1&keywords=raspberry+pi+wireless GRBL Controller CNC Shield V4 http://www.aliexpress.com/item/3DV4-CNC-Shield-V4-Nano-3-0-Reprap-Stepper-Drivers-Set-for-Arduino-Free-Shipping/32254632182.html End Stop Switch (Philmore 30-2501)(Total needed 3) http://www.intertexelectronics.com/Philmore-30-2501-SubMin-Snap-Action-Switch-SPDT-5A125V-Short-Lever-P767.aspx 5mm-8mm coupler (Total needed 3) http://www.amazon.com/Coupling-Coupler-Connector-Tighten-Screws/dp/B00ZC6U33G/ref=sr_1_5 Power Switch (only 1 needed) http://www.amazon.com/KCD1-Round-Rocker-Power-Switch/dp/B00TGQ7HK0/ref=sr_1_14 1/8" and 1/4" Er11 Collet http://www.amazon.com/Spring-Collet-Engraving-Machine-Milling/dp/B00ORF99Q0/ref=sr_1_1 carbide bits (For PCB etching) http://www.amazon.com/Generic-Degree-Carbide-Engraving-Router/dp/B00EQ1WI2C/ref=sr_1_13 #6-32 tpi x 2 in screws (Total screws needed 4) (home depot Everbilt Model # 803071 Internet # 204274608 Store SKU # 528433) http://www.homedepot.com/p/Everbilt-6-32-tpi-x-2-in-Coarse-Zinc-Plated-Steel-Round-Head-Combination-Machine-Screw-5-Pack-803071/204274608 #6- 32 x 1 in screws (Total screws needed 18) (home depot Everbilt Model # 803041 Internet # 204274605 Store SKU # 526843) http://www.homedepot.com/p/Everbilt-6-32-x-1-in-Coarse-Zinc-Plated-Steel-Round-Head-Combination-Machine-Screw-8-per-Pack-803041/204274605 m4 25mm screws (Total screws needed 16) http://www.amazon.com/0-7mm-M4x25mm-Hexagon-Socket-Screws/dp/B011BNRXUE/ref=sr_1_1 m4 16mm screws (Total screws needed 24) http://www.amazon.com/80-20-11-4516-Metric-Socket/dp/B00JS158C2/ref=sr_1_7 m3 16mm screws (Total screws needed 6) http://www.amazon.com/16mm-Socket-Machine-Screw-Black/dp/B00W97MTII/ref=sr_1_1 Round head machine screw. 4-40 x 1/2" (Total Needed ?) http://www.frys.com/product/2069070 Round head machine screw 2-56 x 1/4''(Total needed ?) http://www.frys.com/product/2069025 Heat Shrink Tubing http://www.amazon.com/Vktech-150pcs-Shrink-Tubing-Sleeving/dp/B00EXLPLTW/ref=sr_1_1 DC Power Jack 5.5mm (only 1 needed) http://www.amazon.com/gp/offer-listing/B00XJ23U3A/ref=dp_olp_new Dupont Jumper Wire Cable Female (Total needed ?) http://www.amazon.com/Sunkee-Dupont-Jumper-Female-Connector/dp/B00CGWVFWW/ref=sr_1_2 3.5mm Gold Bullet Connector https://www.amazon.com/Generic-3-5mm-Bullet-Connector-Battery/dp/B00EZKW1T4/ref=sr_1_1 MicroB Plug https://www.adafruit.com/products/1826 Power Brick http://www.amazon.com/LCD-AC-Adapter-3-Prong-Power/dp/B003TUMDWG/ref=sr_1_1 Buck DC-DC Adjustable http://www.amazon.com/Retailstore-LM2596-Adjustable-Supply-Converter/dp/B009HPB1OI/ref=sr_1_2 ------------------------------------------------------ Parts for small motor Brushless Motor http://www.amazon.com/Hobbypower-A2212-1000kv-Brushless-Multicopter/dp/B00E7LG85O/ref=sr_1_2 8mm Pillow Bearing http://www.amazon.com/FKFL08-Mounted-Housing-Self-aligning-Bearing/dp/B00DN6C54M/ref=pd_sim_328_6 DN C8 ER11M Straight Shank Chuck http://www.amazon.com/ER11M-Holder-Straight-Improve-Efficiency/dp/B00SZK57IM/ref=sr_1_4 #8 32x 3/4 in (total screws needed 2 and 2 nuts) ------------------------------------------------------ ------------------------------------------------------ Parts for Large motor Brushless motor with 5mm Saft (using: Turnigy Aerodrive SK3 - 3536-1400kv "reversed shaft" ) http://www.hobbyking.com/hobbyking/store/__35028__Turnigy_Aerodrive_SK3_3536_1400kv_Brushless_Outrunner_Motor_US_Warehouse_.html mystery 60a ESC (motor only needs a good 40A ESC) https://www.aliexpress.com/item/Mystery-Cloud-60A-brushless-ESC-RC-Speed-Controller-For-Rc-Helicopter-Airplane/32618992643.html er11 chuck with 5mm ID shaft https://www.amazon.com/Shaluoman-Lengthened-Clamping-Engraving-Machine/dp/B01E2AJ07M/ref=sr_1_1 m4 25mm screws (Additional 4 needed ) (will need 4 less 16mm M4s) http://www.amazon.com/0-7mm-M4x25mm-Hexagon-Socket-Screws/dp/B011BNRXUE/ref=sr_1_1 m3 16mm screws (Additional screws needed 6) http://www.amazon.com/16mm-Socket-Machine-Screw-Black/dp/B00W97MTII/ref=sr_1_1 ------------------------------------------------------ ------------------------------------------------------ Tachometer info * Tested circuit using Attiny85 and 3mm IR LED emitter and receiver * GPIO assignments (BCM) power =21 #shutdown button center=20 up =26 down =13 left =16 right =19 rpmPin = 6 #input pin to sense RPM escPin = 12 #output to the ESC #read PWM value = 15 (/dev/ttyAMA0) * Test script before adding it to startup * unzip script in your documents folder /home/pi/Documents/mlmCnc/main.py * Add following to rc.local (sudo vi /etc/rc.local) sudo pigpiod sudo /home/pi/Documents/mlmCnc/main.py & *Make sure serial port TTYAMA0 is available *Make sure pigpio libraries are installed * Full write up when completed ------------------------------------------------------