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Position Verification

Calibration of High-Resolution Surface Tachometers. Team Members: Matt Hagon Michael Lee Jennifer Egolf Christopher Pawson. Sponsors: Jose Vazquez, Ted Myrick, Patrick Buehler ; Advisor: James Glancey. Proof of Concept. Project Goals. Final Concept.

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Position Verification

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  1. Calibration of High-Resolution Surface Tachometers Team Members: Matt Hagon Michael Lee Jennifer Egolf Christopher Pawson Sponsors: Jose Vazquez, Ted Myrick, Patrick Buehler; Advisor: James Glancey Proof of Concept Project Goals Final Concept • Tachometers mounted to make contact with disc • Disc rotated using a motor and gearbox • Multiple tachometers calibrated simultaneously to surface velocity of disc • Motor speed selected through user interface • Design and manufacture a portable device for the relative calibration of multiple surface tachometers. • Eccentricity Testing • Wheel and shaft rotated on v-blocks • Radius variation measured with dial gage • Confirmed radius variation will not cause speed variations above design specifications Disc Project Background • Position Verification • Properly calibrated tachometers can detect small differences in surface velocity across a system. • Used as diagnostic tool to reduce the downtime of systems. • Currently a lathe used for calibration. • Problems: • Cannot calibrate tachometers relative to each other • Not portable Tachometers Motor • Position Testing • Tachometers of various sizes positioned on disc and shaft assembly • Confirmed that 4 tachometers of all sizes can be mounted simultaneously Tachometers Tachometers Prototype Ranked Customer Wants Tachometer Motor • Complete System Test • Method: • Mount surface tachometer on rotating disc • Note speed variation in system Tachometer speed variation without gearbox (just motor effect): Tachometer speed variation with gearbox: Top 5 Design Specifications Speed Amplitude Speed Amplitude Shaft and disc assembly Motor connects to controller with user interface Gearbox Switch for speed selection Speed Frequency Speed Frequency • Large speed variations • Insignificant variations in speed Conclusion • Use of current gearbox creates unacceptable speed variations • Modifications to system • Eliminate gearbox for direct drive system • Tachometers mounted directly to extended shaft Power supply Drive

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