Transcript Team name
Thomas Fleming Dan Frost Vidhya Raju William Stanford Client: Carol Rasmussen Advisor: Dr. Tom Yen Problem Statement and Specifications •Main problem: restricted motion •Patients may not be responsive to instructions •Need following degrees of motion 1. Vertical 2. Horizontal 3. Rotational 4. Tilt, if possible http://cache.daylife.com/imageserve/0bS97VJbYyfaB/610x.jpg Design Constraints •Height, angle and rotation •Distance from patient’s eye •Resolution of movement •Loading (weight of machine 83 lbs) •Ergonomic interface with patient and technologist •Animals and humans Design 1 – Overhead Arm Pros •Movement in x, y and z directions •Tilt and rotation possible •Good coarse adjustment Cons •Expensive to build or buy •Large, bulky •No fine adjustment Design 2 Precision Frelon Plain-Bearing Slides with Lead Screw Pros •Precise adjustments •Can withstand five times load required •User friendly controls Cons •Expensive to buy all parts http://www.mcmaster.com/ •Difficult to assemble for all movements •Torque considerations Design 3 Fine-Adjust Cross-Slide Tables Pros •Precise adjustments •Can withstand two times load required •Hands provide easy adjustment Cons •No tilt option •Requires modification for rotation http://www.mcmaster.com/ •Heavy Design Matrix Design Constrain ts Weight Overhead Arm Precision Frelon PlainBearing Slides with Lead Screw FineAdjust CrossSlide Tables Degrees of Motion 20 19 17 17 Ergonomic s 15 3 10 13 Load Bearing 20 5 15 20 Ease of Rotation 10 10 5 7 Precision 15 2 15 14 Cost 20 5 10 19 Total 100 44 72 90 Design Decision: Fine-adjust Cross Slide Table •Relatively low cost ($285 of $1000 budgeted) •Allows us to focus on rotation options •Could be modified for electromechanical control http://www.palmgren.com Future Work: Rotation & User Interface •Rotation about a fixed point at the front edge •Ball casters •Fix to the edge of the table •Current interface has multiple dials •Reduce to a single control interface http://www.mcmaster.com/ http://www.chproducts.com