12.Mechanical Design, Machine Design

Machine Design week takes us to the design and fabrication of this Yarn winder that involves mechanism, actuation and the real life applications.This has helped us on team work and help us monitor for the final project by giving ideas on promoting the project with mechanism, actuation and its applications.It is never easy for us but was proud to develop simple yarm winder machine which can benefit to the Bhutanese weavers.

Assignments for week 12:

1. Group Assignment

• design a machine that includes mechanism+actuation+automation+application
• build the mechanical parts and operate it manually
• document the group project

2. Individual Assignment

• Document your individual contribution

1. Group Assignment.

Our group Assignment link is here

Learnings outcomes from the group assignment:

This group assignment has made me to understand the importance of the team work.Each one of us have contributed equally to this simple machine design and fabrication.The stepper motor and DC motors are the main machine elements of this project which can drive the shafts, converting the electrical energy into mechanical.

The Designing and fabricating a simple machine like Yarn winder consists of running programming, actuation and testing to real life applications.

2. Individual Assignment.

My Contribution to our Machine Design.

My role mainly consists of designing the stands and parts of the yarn spinner, 3D printing, assembling and working principle.

1. Working Principle of Yarn Spinner.

initial system plan

The yarn thread from wool pool is connected to the removable yarn spin stick via the yarn guide of the lead screw rod and make one or two turns of on it.The DC power supply equipment channels 1 and 2 are connected to the stepper motors of lead screw rod and mini DC motor of yarn spin rod respectively.When the power is ‘ON’ from both the channels simultaneously, the stepper motor gets started and converts the electrical energy into the rotational motion, making the lead screw rod to reciprocate to and fro, ensuring the thread guide to make displacement of about 180mm between the two limit sensors mounted each on their stands.The rod mounted vertically below it provide support and regulate smooth movement of thread guide.

Mean while, the removable yarn spin stick rotates as its motor starts, making the yarn to make its pattern of 180mm on the stick.The user can stop this when it reach to the required size of the yarn spin and stop the DC power supply channel switches.Remove the yarn spinned stick and place new one to continue the work.

1. Stand design for Stepper motor.

The steps below shows how it is designed which was to be mounted on the base.

I have choosed top plane and sketched with those dimensions and extruded.

Then, made holes towards base to be clamped by screw.

To the top drawn another circles with 8mm diameter to be clamped from top and made threads with those parameters.

I choosed to offset and then extruded to hold the stepper motor from sides.

Repeated same steps to add and hold from other side.

The stepper motor stand looked as below and was done Slicing and 3D printed.

1. Stand for Yarn Spin. Again choosed top plane to draw that.

Copied the sketch and made slight change to the above stand where the spinned yarn stand can be removed through it.

1. Stand for lead screw rod.

I have edited to the yarn stand by making at slot where the limit sensor can be clamped with it. The thickness was also increased.

Then, 3D printed the stand.

1. Spur gear Using the Fusion 360 under Utility, we have set specification of spur gear required and 3D printed.

1. Motor holder. To make mini DC motor stable for yarn spin, we have designed it and 3D printed.

1. Wool frame base.

1. Joint for Wool frame shaft.

My Learning outcomes from this individual assignment.

This assignment helped me to understand the proper plan and design for the fabrication.I have wasted some materials like PLA filaments while i have to 3D print stands and components.The design has to be match as per the electronic components and it actuation.Designing spur gear mechanism of quick return mechanism was not much applicable which i have designed initially.

Design files

Fusion design files here