Key Deliverables in MSD 1
- A standalone fixture design for the work piece
movement portion of the machine
- Detailed feasibility analyses and documentation for all fixture design decisions
- Detailed Bill of Materials containing component level parts
- Preliminary Build Plan
- Preliminary Test Plan
- Test plan should reinforce the Engineering Requirements
- Plans and Risk Assessment for MSD II
Key Questions Answered in MSD I
- What control systems and motors will be needed for the work piece movement portion of the machine?
- What methods can we use to vertically translate a
large load at a very slow velocity?
- What loads do we expect to encounter?
- What design dimensions will be critical for later integrating into the whole system?
To view our Engineering Requirements in finer detail, click here.
Mechanical System DesignLocking Mechanism
Based off a 350lb load and 60psi air pressure.
1/4 inch nylon tubing with push to connect fittings.
Gravity return on the double acting cylinders.
Valve is normally closed and has an input and exhaust position.
Drawings, Models, and Schematics
Assembly in the Down Position
Angles on the Dovetail
Support Brackets for Studs, Front View
Support Brackets for Studs, Top View
Linear Actuator Selection
The actuator selected from the Rockwell website was the MPAI-B5450.
The fixture parameters were entered in the motion analyzer in order to verify we are using the appropriate motor. The results verified that we did in fact select the correct motor to use for this system. Several options were provided with the 5450 being one of the most reliable.
The points on the graph below show that our results are well within the tolerable range of the actuator.
Details of the performance under our system conditions can be seen here:
The software used for the selected PLC uses a concept called Ladder Logic. Ladder logic is a horizontal programming language. Visually, inputs are lined up vertically on one side and outputs are lined up vertically opposite them. The inputs and outputs are “horizontally” connected to each other, in a manner that loosely resembles a ladder. The horizontal connections contain sequential control logic (AND, OR, NOT, ect.). In order for power to travel to a specific output multiple conditions must be met. These conditions are determined by the program that is written and rely on input conditions as well as the circuit logic in the “rungs” that connect one side of the ladder (inputs) to the other (outputs).
A very simple example of the ladder logic for a light connected to a switch is:
More research must be done over the intersession in order to develop a successful program. Some links that we found helpful to start learning the basics were:
Bill of Materialsclick here.
Generalized Build Plan
Plans for MSD II
- Finalize design phase: Frame, locking mechanism, top plate
- Finalize all drawings and models
- Finalize detailed BOM
- Machine Parts that are to be made in house
- Order parts and begin assembly plan
- Once assembled, begin test plan
- Conduct Phase reviews and present at Imagine RIT