Progress Report

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Progress Report
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What weve done so far

• A fluid dynamics model to calculate leakage
• A method to set pass/fail limits for roughness
• A Quality Control machine to recommend
• A sales representative contact at Dymek
• A test plan
• Polishing materials ordered

http//www.veeco.com/products/Metrology_and_Instru
mentation/Optical_Profilers/Wyko_NT9300/
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Test plan

• Speed, Time, Pressure, and Direction tests will
  be conducted with Course Grit Ruby stone

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After testing

• Measuring Roughness and Roundness at the NHMFL.
• Set parameters and tolerances for the surface
  profiler.
• Incorporate a fluid dynamic model for roundness
  measurements.

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Roughness and Roundness
http//www.taylor-hobson.com/faqrounddetail.php?fa
qid44
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Fluid Dynamic Models

• Capillary Seal
• Models flow around two concentric cylinders.
• Perfect model for the measurements of flow
  between the plunger and plunger body.

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Fluid Dynamic Models

• Spherical Step Bearing
• Measures thin film flow around a spherical check
  valve
• Used to measure the flow rate between the check
  ball and the plunger.

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Spring Tasks
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What we still need

• Carry out polishing tests at GT Tech and machine
  shop
• Analyze samples at NHMFL
• Fluid dynamic model for roundness
• Combined model that calculates leakage given
  roughness and roundness

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Last minute ideas

• Change from stainless steel ball bearings to high
  temperature rubber Viton
• Rubber will allow some deformation to form to the
  surface of the seat
• Could potentially eliminate the need for polishing

Image from www.smallpartsinc.com
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Website

• http//www.eng.fsu.edu/willibe/gt10
• Questions???