P13045: Mobile Pediatric Stander

Build, Test, Document

Table of Contents

Website should document your journey through MSD, so include work-in-progress as well as latest results. Use pdf's for display whenever possible so that information is easily viewable without the need to download files and open applications. (Your EDGE file repository should still contain original files).

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MSD II Schedule

MSD II Initial Schedule

MSD II Initial Schedule

MSD II Actual Schedule

MSD II Actual Schedule

Shared Vision

Programming Plan

Initial Component Designs

Tray Bracket Design

Motorized Wheel Mount Design

Remote Control Design

Bottom of Remote Control Housing Design

Main Board Housing Design

Remote Housing Top Design

Final Tray Mount Design

Final Tray Design

Final Tray Design

The only design that changed significantly from the initial design was the mount for the tray. After the week 7 demo with the customer, it was determined that the design was not robust enough and needed to withstand at least 20 lbs of force without deflection. This design was created utilizing the main channel already on the stander and adding lengths of aluminum 80/20 to create the movement versatility. Metal knobs were used to adjust the tray. Also, 2 aluminum trusses were added to add stability to the tray mount. Only one can be seen in the picture above.

Major Unforeseen Roadblocks

Rotation of Motorized Wheels

The sensor mount was designed and made out of aluminum as can be seen above and bolted into the stander. This method of attachment did not provide enough torque to resist rotation if the wheel was kicked. Pin holes were drilled into the aluminum mount and 1/8" pins were attached with epoxy into the stander wheel mount. This allowed for the aluminum mount to slide on the pins and get screwed on. The pins helped the wheel stay straight and also locktite was used for the main bolt on the bottom of the stander.

Over-sensitivity of Ultrasonic Sensors

Initially, the idea of using ultrasonic sensors at various locations on the stander seemed like it would make it safer. After some analysis and testing with narrow and wide range sensors, it was determined that they just picked up too many objects and made the stander virtually unusable.

Instability of Original Tray Mount Design

The original tray mount design, which can be seen above, did allow for the versatility that the customer was looking for, but was not robust enough. The original design was made out of 16G steel that was formed and welded. After the prototype was shown for the customer, she decided that she wanted the system to be more robust. It was agreed upon that the final design must be able to hold up 20 lbs without deflection. The new tray mount design which can also be seen above was tested and does hold 20 lbs without deflection.

Test Plans & Test Results

Safety Tests-Toggle Mode

Safety Tests-Press and Hold Mode

Final Status of Engineering Specs

Final Status of Engineering Specifications

Final Status of Engineering Specifications

User or Operator Instructions/Manual

Instruction Manual

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