Preliminary Detailed Design Review Periodontal Measurement Test System February 1, 2013

Periodontal Measurement Test System Current method Goals of new method

Customer Needs

Specifications

Pugh Matrix

PHANTOM TOOTH Canadianawareness.org

Specifications SpecDescriptionCN 3.1 The phantom tooth shall be made of non-biological materials that mimic human tissue with respect to ultrasonic wave propagation properties. 8, 9, The phantom tooth shall be able to be quickly replaced within the phantom holding fixture. 3, The phantom tooth geometry shall allow for quick alterations of the physical relationship between the tooth and the gums. 1, 4

Phantom Design

Relevant US Properties Density Speed of sound Acoustic impedance

Material Selection

Contacts Dr. Phillips – RIT bio medical engineering Dr. Maria Helguera – RIT imaging science – Biomed ultrasound Eastman Dental Clinic – Dr. Caton Bradley Rogge – RIT’s Pre-dental association Professor Lamkin-Kennard – RIT Mechanical Engineering Hamad Ghazle, Jodie Crowley – RIT Ultrasound

FIXTURE DESIGN

Specifications SpecificationDescription Customer Needs 1.0 Test Probe Fixture 1.1The test probe fixture must be able to move through 3 axis.5 1.2The test probe fixture shall be compact and portable.3, 4, 11, The test probe fixture shall be simply constructed to allow for maintenance to be performed by untrained personnel relying only on a maintenance manual (to be provided).3, 4, 11, The test probe fixture shall allow for position changes on or about any axis to a programmatically specified point to within 0.1 mm for linear movement or 1° for angular movement.2, 5, The test probe fixture shall hae minimal impact on the environment and noise levels within the surrounding area while active. 5, 7, 8, 9, 10, Phantom Holding Fixture 2.1The phantom holding fixture must be able to move through 2 axis The phantom holding fixture shall be simply constructed to allow for maintenance to be performed by untrained personnel relying only on a maintenance manual (to be provided).3, 4, 11, The phantom holding fixture shall allow for position changes on or about any axis to a programmatically specified point to within 0.1 mm for linear movement or 1° for angular movement.2, 5, The phantom holding fixture shall allow for the phantom tooth to be replaced by a human mandible The phantom holding fixture shall be simply constructed to allow for maintenance to be performed by untrained personnel relying only on a maintenance manual (to be provided).3, 4, 11, 12

Positioning System Model

Power Screw

Turn Table

Assembly Drawing

Pitch Movement

Power Screw Assembly

Power Screw Specs Nut Specs Material303 StainlessSelf Lubricating Polyacetal Total Length (in)241.9 Pitch (in)0.25 Diameter (in)0.375 SupplierHaydon Kirk Price Efficiency (%)70 Thread DirectionRight Dynamic Load-10 Drag Torque (oz-in)-1 to 5

Nut Detailed Drawing

Turn Table Drawing

Pitch Axis Drawing

Mounting Table Drawing

Guide Rail Clamp

Pitch Selection Calculations Maximum Screw Pitch to Meet Accuracy Req's Expected Stepper Motor Speeds w/o Micro-Stepping (rev/sec)16 w/ Micro-Stepping (rev/sec)2Pmax (mm)36 Motor Angular Accuracy (deg)1Pmin (in) Desired Linear Accuracy (+/- mm)0.1Maximum Screw Pitch to Meet Travel Time Req's Estimated Screw Length (in)10 Estimated Screw Length (mm)254 Estimated Time of Travel (s, full L)12Pmax (mm) Chosen Screw Pitch (in)0.25Pmax (in)

Torque Requirement Calculations PropertySymbolUnitsValueRequired Torque to Overcome Friction Screw PitchPrev/in4 Load on ScrewWoz16 Screw Efficiencye0.7Tfric (oz-in) Static Friction Coeff-nut on screwμs0.04 Accel of GravityGin/sec2384 Jload Time to reach constant Veltsec0.1 Density of Screwρoz/in Jscrew Length of ScrewLin10 Radius of ScrewRin Load on ScrewWoz16 Ang velocity of motorωrad/sec Taccel (oz-in) Screw PitchPrev/in4 Motor InertiaJmotoroz-in^ Total Torque (oz-in) Note: All values for 1lb load on horizontal screw

Bearing Selection Very low radial loads – Guide rail support Small axial loads – Low friction nut – Guide rail support Basic radial bearing should handle loads

Bearing Specs StyleDouble Sealed ID (in)0.375 OD (in) Width (in) Dyn. Load Cap (lbs)255 Price (ea)8.38 Quantity6

Couplings Coupling Specs MaterialSteel ID (in)0.25 OD (in)0.5 Length (in)0.75 Set Screw Size10-32 Max RPM3450 Max Torque59 Price6.93

Collars Collar Specs MaterialSteel ID (in)0.25 OD (in)0.5 Length (in) Set Screw Size10-32 Price0.63

ELECTRICAL

Specifications 4.0 – Proof of concept put together, proved we could attain appropriate control required for final system 5.0 – Unable to test, waiting on probe, able to communicate with an oscilloscope, but no data has been attained from probe to date due to lack of probe 6.0 – Have data logging already written in code, working on limit comparison programming

BLOCK DIAGRAM

WIRING DIAGRAM

PROGRAMMING FLOWCHART

ELECTRICAL BOM AND COST Preferred List ItemPart NumberManufacturerLead TimeCostQtyExtended Cost Arduino UNOUNO R3Arduino3-5 days $ ServoHS-225MGHitec3-5 days $ $ StepperRB-SOY-14SOYO3-5 days $ $ EasyDriverB004G4XR60Sparkfun3-5 days $ $ Misc Budget $ $

Justification Control SystemMotors Servos were chosen for combination of price, mobility, and durability. Metal servo with high torque rating to allow ease of use with system design Stepper motors were picked based off of Voltage, Current, torque, and Driver limitations

Risk Assessment

High Risk Items Non-bio materials – Availability – Similarity to human tooth Formation of phantom – Processes available hinge on materials chosen Probe!

Questions/Comments/Suggestions