P14032: Skipper's Chair
/public/

Build, Test, Document

Table of Contents

MSD II BoM

Updated Bill of Materials

The bill of materials will be updated throughout each phase as parts are purchased.

MSD II Risk Management

Updated Risk Management

Assembly Instructions

PVC Chair & Steering
 Figure 1: Chair Assembly

Figure 1: Chair Assembly

Figure 2: Steering Assembly

Figure 2: Steering Assembly

Build, Test, and Integrate

PVC Chair & Arms Cement Assembly

Using 1.5 inch PVC stock, the parts were cut in the machine shop. The tolerance was not ideal (~1/8 inches), as it was difficult to align the saw blade to the desired cutting mark.

Once the PVC parts were cut from 10' PVC stock, a dry run was performed in order to test the chair before cementing the joints together. During the dry run, a reference line was drawn across each joint to align them during final assembly. The pictures below show the assembly workstation and a complete sub-assembly.

Priming/Cementing PVC Chair & Arms
 Figure 4: Work Area Setup

Figure 4: Work Area Setup

Figure 5: PVC Top Chair Beam Assembled

Figure 5: PVC Top Chair Beam Assembled

Complete PVC Chair & Arm
 Figure 6: With Prime/Cement

Figure 6: With Prime/Cement

Figure 7: Complete with Sail

Figure 7: Complete with Sail

 Figure 8: Complete Arm

Figure 8: Complete Arm

A spare sailboat sail was used to make the chair upholstery after cementing was complete.

Steering Subsystem

An initial test was conducted to determine the range of motion achievable by the 'Tractor Arm' iteration. Only one side of the steering was tested. It is assumed that both steering arms will achieve similar motion.

A table was used as the base for the sub-assembly. The dowel was attached to the table with C-clamps, which were able to securely it fairly well.

The range of motion for the tiller was estimated using a protractor. The steering arm would begin in the neutral position (180 degrees vertical) and the protractor would be used to determine the angle achieved while 'pushing' and 'pulling' with the arm.

Motion Test
 Figure 9: Steering Subassembly

Figure 9: Steering Subassembly

Figure 10: Test Bearing

Figure 10: Test Bearing

Assumptions:

Observations:

Test Plans & Test Results

The following document below represents the updated test plans from MSD I. A "Testing Schedule" chart was added that splits the testing phases to three distinct time frames. In addition, an engineering team was designated to carry out each individual test. A more detailed outline can be found in the official MSD II schedule.

Updated Test Plans

A steering and weight test were conducted to ensure the stability of the system. These tests fall under "Minimum FOS of critical elements" in the Test Plan document linked above.

Steering Test
 Figure 11: Work Area Setup

Figure 11: Work Area Setup

Figure 12: Steering Arm with Spring Scale

Figure 12: Steering Arm with Spring Scale

Setup:

Method:

Results:

During the test, there was deformation observed in the arm, but it was not permanent. The deformation was barely noticeable, which agrees with our previous Ansys analysis of the arm (Detailed Design section).

Weight Test
 Figure 13: Position 1

Figure 13: Position 1

Figure 14: Position 2

Figure 14: Position 2

Setup:

Method:

Results:

The initial goal of applying 300 lbs to the chair was changed to a lighter weight. This was to make the test more realistic to what the user of the chair may be. Similar to our steering test, there was deformation observed in the area where the weight was being applied to, but it was not permanent. Both weight tests passed and the Ansys simulations were proven correct.

User or Operator Instructions/Manual

Assembly Video

Line Attachment Video


Home | Planning & Execution | Problem Definition | Systems Design | Detailed Design | Build, Test, Document | Project Review | Photo Gallery