Table of Contents
Team Vision for Problem Definition PhaseThe process of creating a final problem definition was iterative. To begin, each team-member wrote a draft problem definition. All problem definitions were compiled into a single draft definition. During the Week 2 Thursday meeting, this single draft definition was edited into a draft in preparation for the week 3 Problem Definition Review.
Currently, 3-dimensional (3D) concrete printers are used to print large-scale structures such as houses. Small and medium scale prototyping with concrete is currently done using molds which are inaccurate and time consuming. This leaves Multidisciplinary Senior Design (MSD) students at Rochester Institute of Technology (RIT) without an efficient, accurate, cost-effective way to prototype in medium-scale with concrete.
A computer-controlled motion system will be used to deposit prepared concrete along a planned path. The concrete dispenser mechanism moves through space to deposit concrete. The industry standard machine language, G-code, will be implemented. This solution will enable rapid low cost prototyping with concrete by MSD students at RIT.
A progress goal is being prepared for prototyping by the end of the 15 weeks (for MSD II).
Project Goals and Key DeliverablesThe project will include material specifications to choose concrete best-suited to the system. The goal of this project is to create a medium-sized 3D printer that can be disassembled for storage. Additionally, the project develops a concrete mix that is at least half as strong as standard concrete. The expected result is a functional prototype MSD teams may use for their projects.
ConstraintsThe 3D printer must meet the following constraints:
- Print items up to 1m in diameter and 0.5m in height.
- Printed objects must be dimensionally accurate within 12mm.
- Cure time no longer than 48 hours.
- Concrete dispenser does not clog.
- Final print must have strength at least half that of regular concrete.
- Post-print cleaning must take less than an hour.
- Machine can be disassembled in less than 30 minutes.
- Budget not to exceed $1,500.
- Able to be stored in an MSD or Construct space.
RequirementsThe requirement gathering process consists of Customer Requirements, Engineering Requirements and a House of Quality. The process of our requirement gathering process is documented below. For the final version of the Requirements, see this link.
Customer Requirements (Needs)The customer requirements document is a version controlled living document that is modified through iterative steps to match a customers needs. The first version of the customer requirements was drafted from the PRP. Then, the customer requirements were refined after the further customer interviews. The customer requirements can be found in the CR tab of the appropriate version of the Requirements Excel sheet under the Requirement Document Versions header.
This image shows a preview of the most up-to-date version of the Customer Requirements.
Engineering Requirements (Metrics & Specifications)The engineering requirements document is a version controlled living document that is modified through iterative steps to match the customers requirements. The first version of the engineering requirements were drafter from the PRP. Then, the engineering requirements were refined after further customer interviews. The engineering requirements can be found in the ER tab of the appropriate version of the Requirements Excel sheet under the Requirement Document Versions header.
This image shows a preview of the most up-to-date version of the Engineering Requirements.
House of QualityThe house of quality (HOQ) is a way to ensure that customer requirements are addressed by engineering requirements. In the first version of the HOQ it can be seen that there are a few blank lines that have been addressed in later versions of the HOQ. The HOQ can be found in the HOQ tab of the appropriate version of the Requirements Excel sheet under the Requirement Document Versions header.
This image shows a preview of the most up-to-date version of the HOQ.
Requirement Document Versions
Design Review Materials
- Pre-read document for the Problem Definition Design Review
- can be found here.
- Presentation for the Problem Definition Design Review
- can be found here.
From this presentation the team decided to make some changes for future presentations. It was recommended by multiple guides and customers to present directly from EDGE in order to display all of the most up-to-date information. Future prereads will highlight modified documents and general outlines of the presentation.
Plans for Next PhaseThree week plan documents can be found below for each team member.