OSHE Growbot Motor Encoders: Difference between revisions

Revision as of 05:41, 5 December 2019

OSHE Growbot Motor Encoders

Project developed by [Zach Arnold]

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Abstract

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.

Bill of Materials

Motor Encoders File Download

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

MOST Delta RepRap or similar RepRap 3-D printer
M3 Allen Wrench
M4 Allen Wrench
Pliers
Soldering iron

Technical Specifications and Assembly Instructions

Encoder Connector (5 minutes to assemble)

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

Encoder Mount (10 minutes to assemble)

Print the encoder mount for motor housing - 50mins at 15% infill with Prusa MK3s
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
Attach the encoder to the mount using 2 M2x8 bolts
Finally, use this assembly within Drew's motor mount, OSHE Growbot Mounting Units
Should look like the image below

Motor Testbench (40 mins to assemble)

Print the test bench parts - 4.5 hrs at 15% infill with Prusa MK3s
Follow the encoder connector directions
Follow the encoder mount instructions with 2 M3 inserts instead of 4
Attach the motor to the test bench mount using 4 M4x8 bolts
Attach the encoder mount onto the test bench using 2 M3x8 bolts
Should look like the image below

Common Problems and Solutions

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

If your solution is not a low cost one then it is not really appropriate.

Estimate your costs
Find a commercial equivalent, cite it and put the [url in square brackets]
Calculate $ savings and % savings

Benefited Internet Communities

[Open Source Hardware Enterprise | OSHE]
Name and add links to at least 5 using single brackets around [url name]

References

↑ HobbyKing Motor: https://hobbyking.com/en_us/turnigy-aerodrive-sk3-6374-149kv-brushless-outrunner-motor.html
↑ DigiKey Encoder: https://www.digikey.com/product-detail/en/cui-devices/AMT102-V/102-1307-ND/827015

[1] HobbyKing Motor: https://hobbyking.com/en_us/turnigy-aerodrive-sk3-6374-149kv-brushless-outrunner-motor.html

[2] DigiKey Encoder: https://www.digikey.com/product-detail/en/cui-devices/AMT102-V/102-1307-ND/827015

[1]

[2]

@@ Line 152: / Line 152: @@
 == Technical Specifications and Assembly Instructions==
-''' Encoder Connector '''
+''' Encoder Connector (5 minutes to assemble) '''
-# Print the encoder connector and clean the infill - 15mins with 50% infill with Prusa MK3s
+# Print the encoder connector and clean the infill - 35mins with 50% infill with Prusa MK3s
 # Push the M4 bolt into the middle hole, so the bolt head is recessed
 # Attach nut on the other side
 # Attach the 3D printed piece onto the motor using 4 M3 bolts
-# Should look like this
+# Should look like the image below
-''' Encoder Mount '''
+''' Encoder Mount (10 minutes to assemble) '''
 # Print the encoder mount for motor housing - 50mins at 15% infill with Prusa MK3s
 # Use the soldering iron to insert the heat inserts
@@ Line 166: / Line 166: @@
 # Attach the encoder to the mount using 2 M2x8 bolts
 # Finally, use this assembly within [[User:ajvincen|Drew's]] motor mount, [[OSHE Growbot Mounting Units]]
+# Should look like the image below
+{{Gallery
+|title=Encoder Mount
+|width=135
+|height=180
+|padding=2
+|lines=4
+|align=center
+|File:Ajv_motor_housing_close.PNG|Fig 1: Drew's motor housing with encoder installed
+|File:Zsa_growbot_encoder.png|Fig 2: Upclose encoder mounting.
+}}
-''' Motor Testbench '''
+''' Motor Testbench (40 mins to assemble) '''
 # Print the test bench parts - 4.5 hrs at 15% infill with Prusa MK3s
+# Follow the encoder connector directions
+# Follow the encoder mount instructions with 2 M3 inserts instead of 4
+# Attach the motor to the test bench mount using 4 M4x8 bolts
-# Provide directions for print/assembly - be detailed enough in your “how to” to ensure that someone could construct the device from your description. Consider the elegance of IKEA like instructions.
+# Attach the encoder mount onto the test bench using 2 M3x8 bolts
-# Include print time estimate
+# Should look like the image below
-# Include assembly time estimate
+{{Gallery
-# Including drawings or pictures of the device at stage of assembly at minimum. (http://www.appropedia.org/Special:Upload)
+|title=Encoder Mount
-# Consider video if appropriate
+|width=135
+|height=180
+|padding=2
+|lines=4
+|align=center
+|File:Zsa_growbot_testbench.png|Fig 1: Testbench completed.
+}}
 === Common Problems and Solutions===
-* Include common mistakes/problems to avoid in building your OSAT and how to overcome them
+* 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==