Get our free book (in Spanish or English) on rainwater now - To Catch the Rain.

OSHE Growbot Motor Encoders

From Appropedia
Jump to navigation Jump to search
MOST Delta filament as guide.JPG This page was part of an MTU course MSE4777 OA and MSE4777 OB/MSE5777/EE4777/EE5777: Open-source 3-D printing

Please leave comments using the discussion tab. The course runs in the Fall semester. It is not open edit.


OSHE Growbot Motor Encoders[edit]

Project developed by [Zach Arnold]
Status
This OSAT has been designed but not yet tested - use at own risk.
This OSAT has been prototyped.

You can help Appropedia by contributing to the next step in this OSAT's status.

Abstract[edit]

  • This OSAT project was created to assist the senior capstone project for the Open Source Hardware Enterprise, OSHE Growbot. The parts designed are used in conjunction with Drew Vincent's, motor mounts for the Growbot. The Growbot project can be used to fulfill the OSAT 'Zero Hunger' goal.
Zsa growbot motorSetUp.png

Bill of Materials[edit]

Encoder Connector

Item Quantity Price Per Price Total
Encoder Connector.stl 1 4.7g $0.13
M4x20mm 1 $0.10 $0.10
M4 Nut 1 $0.15 $0.15
M3x8mm 4 $0.08 $0.32
Turnigy SK3 6374 Motor [1] 1 $83.82 $83.82


Encoder Mount for Motor Housing

Item Quantity Price Per Price Total
Encoder Mount Motor Housing.stl 1 11g $0.31
M3 Heat Insert 4 $0.20 $0.80
M2 Heat Insert 2 $0.15 $0.30
M3x10mm 4 $0.10 $0.40
M2x10mm 2 $0.07 $0.14
CUI AMT-102-V [2] 1 $23.63 $23.63


Motor Test Bench

Item Quantity Price Per Price Total
Motor Test Bench V3.stl 1 42g $1.17
Encoder Mount Motor Test Bench.stl 1 10g $0.28
M3 Heat Insert 2 $0.20 $0.80
M2 Heat Insert 2 $0.15 $0.30
M4x8 4 $0.09 $0.36
M3x10mm 4 $0.10 $0.40
M2x10mm 2 $0.07 $0.14
CUI AMT-102-V 1 $23.63 $23.63
Turnigy SK3 6374 Motor 1 $83.82 $83.82

Tools needed for fabrication of the OSAT[edit]

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. 2mm Allen Wrench
  3. 2.5mm Allen Wrench
  4. 3mm Allen Wrench
  5. Pliers
  6. Soldering iron

Technical Specifications and Assembly Instructions[edit]

Encoder Connector (5 minutes to assemble)

  1. Print the encoder connector and clean the infill - 35mins with 50% infill with Prusa MK3s
  2. Push the M4 bolt into the middle hole, so the bolt head is recessed
  3. Attach nut on the other side
  4. Attach the 3D printed piece onto the motor using 4 M3 bolts
  5. Should look like the image below
Encoder Connector
Fig 1: Encoder connector attached to the motor.  


Encoder Mount (10 minutes to assemble)

  1. Print the encoder mount for motor housing - 50mins at 15% infill with Prusa MK3s
  2. Use the soldering iron to insert the heat inserts
    • 2 M2 Heat inserts go into the small holes on the large front face
    • 4 M3 Heat inserts go into the holes on the edges
  3. Attach the encoder to the mount using 2 M2x8 bolts
  4. Finally, use this assembly within Drew's motor mount, OSHE Growbot Mounting Units
  5. Should look like the image below
Encoder Mount
Fig 1: Drew's motor housing with encoder installed  
Fig 2: Upclose encoder mounting.  

Motor Testbench (40 mins to assemble)

  1. Print the test bench parts - 4.5 hrs at 15% infill with Prusa MK3s
  2. Follow the encoder connector directions
  3. Follow the encoder mount instructions with 2 M3 inserts instead of 4
  4. Attach the motor to the test bench mount using 4 M4x8 bolts
  5. Attach the encoder mount onto the test bench using 2 M3x8 bolts
  6. Should look like the image below
Encoder Mount
Fig 1: Testbench completed.  

Common Problems and Solutions[edit]

  • A common mistake is when installing the heat inserts. They need to be flush with the outside of the parts and need to be inserted perpendicular.

Cost savings[edit]

  • This solution is not very cheap if you count the electronics. The entire assembly is ~$100 each due to the motor and encoder cost.

Benefited Internet Communities[edit]

References[edit]