Passion Project ~ 11

ARMBot 3.0 – Grade 11

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This year myself and Reilley have decided to continue on ARMBot and to improve this new 3.0 design completely from the ground up from the introduction of metal parts to a new CAD software, things like taking more thought into designing for ease of assembly and adding sensors so Reilley doesn’t have to bust his ass trying to figure out an angle that a potentiometer can measure. ARMBot 3.0 will have new motors and a better design, more thought out physics and a stronger build.

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UPDATE: 1

I have gotten a lot done in the past few months.

The first part of ARMBot 3.0 consists of making the core actuator that will be responsible for most of the heavy lifting literally. For the design reference for this new linear actuator It will be modeled with the design and function of a real linear actuator. The main difference from this design and the old design is the screw actuator put to take the majority of load as well as the large steel table mount.

As you can see the 3D modeling for the ARMBot 3.0 is marching on at a good pace many pieces have already been printed tested and assembled and more are on the way.

Screw Actuator

This is the new and improved actuator design, this year I have taken a new approach to this design this design is based on real life screw actuators. This actuator is meant to be powered by a 12V DC brushed motor. The mechanical advantage of this screw design is calculated at roughly 1:171 which means that is 1Nm of torque was applied (in a perfect environment with no friction or mechanical inefficiency) the linear force output would be 171N of linear pressure.
Math:
Torque gear ratio: 39/14 = 2.78571428571
Screw IMA(Ideal Mechanical Advantage) = Circumference/Pitch = C/P
C = 39*Pi = 122.52
P = 2
IMA = 122.52/2 = 61.26
Final = 61.26 * 2.78571428571 = 170.652857143
Ratio = 1:170.652857143
Rounded = 1:171

Parts:

Screw Actuator:

  • Ball bearing – Steel
  • Bottom Lid – PLA
  • Drive Gear – PLA
  • Drive Shaft – PLA
  • Housing – PLA
  • Root Gear – PLA
  • Tool Shaft – PLA
  • 12V DC Brushed motor – Steel/Copper/Ferrite

R&P Actuator:

  • Bolt1 – PLA
  • Bolt2 – PLA
  • Bolt-Nut1 – PLA
  • Bolt-Nut2 – PLA
  • Rack – PLA
  • R&P-Housing – PLA
  • R&P-Housing-Arm – PLA
  • Pinion – PLA
  • 5V Stepper – Steel/Copper

Arm Build:

  • Actuator-Support – PLA
  • Actuator-Axel – PLA
  • Arm-Axel-B – PLA
  • Arm-Axel-Full – PLA
  • Arm-Axel-Mid – PLA
  • Arm-Axel-Pot – PLA
  • Arm-Segment-A2 – PLA
  • Arm-Segment-B – PLA
  • Arm-Segment-C – PLA
  • Arm-Support-A – PLA
  • Arm-Support-B – PLA
  • Bolt-Pin 4x – PLA
  • Bracket-Base – Steel
  • Bracket-Connector – PLA
  • Bracket-Support – Steel
  • Handle-Thread – PLA
  • Potentiometer 2x – Stainless Steel/Silicone/PET
  • R&P-Movement-Pin – PLA
  • Table-Arm-A -Steel
  • Table Arm-B – Steel

Scrap:

  • Arm-Segment-A1 – PLA
  • Arm-Segment-Extension – PLA
  • Clip-Female – PLA
  • Clip-Male – PLA

Software:

Software history:

2018-2023 – TinkerCAD

2023-2023 – Fusion360

2023-Present – Onshape

Preferred Software:

  1. Onshape
  2. Fusion360
  3. TinkerCAD

Comparison: