x-scara:SCARA CNC和3D打印机

 Bill of materials === Rods * 1 x 8 mm rod 80 mm length (or hollow axis) * 1 x 8 mm rod 40 mm length (or hollow axis) * 1 x 8 mm rod 60 mm length (or hollow axis) Linear and radial bearings * 4 x LM8UU linear bearings * 1 x LM8LUU linear bearing * 6 x 623 radial bearings (OD/ID/T 10x3x4) * 2 x 6002 radial bearings (OD/ID/T 32x15x9) * 5 x 608 radial bearings (OD/ID/T 22x8x7) Pulley and belts * 2 x 280 mm 2GT closed belt * 2 x 20 teeth 2GT inner bore 5 mm pulley (motor shaft) * 2 x 20 teeth 2GT inner bore 5 mm idler * 2 x 20 teeth 2GT inner bore 5 mm idler without teeth * 3 x 60 teeth 2GT inner bore 8 mm Screws and nuts * 2 x Tr8 Z-Nut (1 is mandatory, 2 are optional) * 70 x M3x10 mm socket head screw * 20 x M3x12 nnm socket head screw * 20 x M3x15 or M3x16 mm socket head screw * 10 x M3x20 mm socket head screw * 10 x M3x30 mm socket head screw * 100 x M3 nuts (2mm thick) Motors * 2 x NEMA 17 motor Endstops * 2 x Neodium 5x5 mm cylindrical magnets (for endstops) * 2 x Hall-effect endstops CAD === For a complete preview of the the assemblies, visit these links: * [Complete arm assembly](https://a360.co/2YkuguU) * [Base arm assembly](https://a360.co/3c0eRo9) * [Shoulder assembly](https://a360.co/3dAIDj8) * [Elbow assembly](https://a360.co/2B50gKS) Printed parts === | Part | Count | Picture | | ---------------------------- | ----- | :-----------------------------------------------------------------: | | **BASE** | | | | Arm_Base_MotorPlate <td> 2<td rowspan=2>  | | Arm_Base_ZPlate_Mid_NutHolder| 1 | | | Arm_Base_ZHub_Top <td> 1 <td rowspan=2>  | | Arm_Base_ZHub_Bottom | 1 | | | **SHOULDER** | | | | Arm_Shoulder_Plate_Top <td> 1<td rowspan=5>  | | Arm_Shoulder_Plate_Bottom | 1 | | | Arm_SideWall_Left | 1 | | | Arm_SideWall_Right | 1 | | | Arm_Plates_Cover | 1 | | | Arm_Shoulder_Connector | 1 |  | | **ELBOW** | | | | Arm_Elbow_Plate_Top <td> 1<td rowspan=5>  | | Arm_Elbow_Plate_Bottom | 1 | | | Arm_Elbow_RodHub | 1 | | | Arm_SideWall_Left | 1 | | | Arm_SideWall_Right | 1 | | | **E3D MOUNT** | | | | Arm_EMount_Base_ABL <td> 1<td rowspan=3>  | | Arm_EMount_Base_Left | 1 | | | Arm_EMount_Base_Right | 1 | | | **ENDSTOPS** | | | | Arm_Endstop | 2 |  | Assembly ===  The arm assembly can be split into five separate stages: 1. Base assembly 2. Shoulder assembly 3. Elbow and extruder mount assembly 4. Connecting shoulder and base 5. Connecting the arm to X-SCARA frame 6. Mount the endstops These parts will then connect together and form the entire arm. The arm can later on be coupled to the X-SCARA frame. You can fully assemble the arm and test it, separately from the frame. Stage 1 - Arm Base ===  ## For a full preview of this assembly go [here](https://a360.co/3c0eRo9). Step 1 - Join the two Z-Plates ---  The *Arm_Base_MotorPlate* must be printed twice. They are designed to be complentary, so one can be placed on top of the other. Before doing so, place the following M3 nuts first and also place *Arm_Base_ZPlate_Mid_NutHolder* inside the Z-Plate to heep the nuts from falling. Step 2 - Attach linear bearings, NEMA motors and Z-hub ---  Above is the screw map of the assembly, it will guide you throughout this step. Attach the parts to the z-plates, in this prefered order: 1. Tighten the **M3x20** screws for the screw-in holes mentioned in **Step 1** This will join the two Z-plates together. If the screws tend to fall out from the screw-in holes, use some Thread Lock Glue to hold them in place. The part's structural resistance doesn't rely on those, don't worry. 2. Attach the **NEMA17** motors with three **M3x10** screws, leaving the fourth one free 3. Attach the Z-hubs with two screws for each 4. Place *only one* trapezoidal Z-nut on one Z-hub and screw it down The second Z-nut is optional, you can use it to eliminate backlash, but it must be tighten after the base is mounted on the lead screws. Otherwise, if the Z-Nuts are not properly aligned with the lead screw pitch, it may lock itself on the Z screw. 5. insert the **LM8UU** and **LM8LUU** bearings and secure them with the corresponding screws After this, the part should feel like one solid piece. The metal linear bearings should properly join both Z-plates. 6. Attach the center idler pulley and secure it down with a **M3x20** screw (place washers!) Place one or more washers between the idlers and the Z-hub. 7. Attach the drive pulley to the motor shaft Step 3 - Install adjustable pulley ---  1. Place the pulley on **M3x30** screw and add washers to align it with the motor pulley 2. Place the screw in *relaxed* position 3. insert an M3 nut using the opening on the other side of the Z-plate and tighten it gently This may seem a bit difficult at first. Use a pair of tweezers to help you out with placing the M3 nut. The installation of the pulley will be finalized when the belt is installed. Step 4 - Attach the 6002 bearing and align belt components ---   Stage 2 - Shoulder component ===  ## For a full preview of this assembly go [here](https://a360.co/3dAIDj8). Step 1 - Install 3 x 608 bearings and the drive pulley ---  Each 608 bearing is connected to the arm plate using three **M3x10** screws. Tighthen the screws for each bearing in the same order, to avoid missalignment. Step 2 - Install the two 2GT x 60 drive pulleys ---  Connect the top **2GT x 60** **shoudler drive pulley** first, with the 8mm rod inserted and attach it to top arm's plate in the same way you connected the 608 bear