OSHE Growbot Motor Encoders

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OSHE Growbot Motor Encoders[edit | edit source]

Project developed by [Zach Arnold]


Abstract[edit | edit source]

  • 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 | edit source]

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 | edit source]

  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 | edit source]

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 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

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

Common Problems and Solutions[edit | edit source]

  • 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 | edit source]

  • 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 | edit source]

References[edit | edit source]