Clam Lake E n g i n e e r i n g Vassar Tree Shear Project

Clam Lake E n g i n e e r i n g  Clint Cosgrove  Matt Lemmons  Lance Klement  Kevin Taylor CL Am La Ke

Current Design  7, 10, 12, & 16” Shears Currently Available  Main focus is on 10” (SS-4)  Frame is stacked steel plates  No rotational capability  Blades not flush with ground

Customer Requirements  Rotation  Flush Cutting  Fewer Frame Parts  More Cutting Force  Must Retain Brush Guard

Engineering Specifications  1100 lb Maximum Weight  3000 psi Maximum Pressure  10” Shearing Capacity  Minimize Overall Length

Patent Searches Industrial Logging  Focused on Grapple  More Complex Systems Other Shears  “Loppers”  Oscillatory Motion

The Competition Skid Steer Solutions  Only uses one shear blade  Hydraulic Rotation  Inefficient Cylinder Angle Grace Manufacturing  Frame is not curved  Cylinders Angle Near 45 o  No rotation

Rotation Selection Criteria  Low Rotational Speed  Must Support Shear Weight  Minimize Cost  Ease of Manufacturing  Utilize Only Existing Hydraulics

Rotation Design Options  Bearings  Expensive  Require Low Tolerances  Drive Rollers  Low Strength  DOM Tubing  Almost Unlimited Variation in Sizes  Appropriate Wall Thickness  Cost Effective © Mcmaster-Carr

Rotation Design Options  Manual vs. Hydraulic  Orifice  Pressure Relief Valve  Selector Valve © McMaster-Carr, hydralicstore.com

Frame Design Criteria  Safety Factor Above 1.5  Fewer Parts  Minimize Weight  Minimize Manufacturing Time

Frame Design Options  Ram Angle  Smooth or Angled Edges  Boxed or Open

Frame Design Options  Plate Thickness  Frame Width  Cut vs. Welded Parts

Flush Cut Design Criteria  Blades Flush With Ground Level  Minimize Cost  Provide a Smooth Cut

Flush Cut Design Options  Remove Bottom Frame Plate  Cut Shorter Blades

Conclusions  Rotation  Hydraulic  DOM Tubing  Orifice Flow Control  Flush Cut  Shorter Blades  Thicker Blade Carriers

Conclusions  Frame  Boxed Frame  0.75” Plates, 0.375” Sides  Smooth Curves

Testing Lab Testing Lab TestingField Testing

Testing

Cost ItemCost Hydraulic Cylinders$300 Control Valve$182 Fabrication$450 Metal$1000 Misc Small Parts$500 Total$2,432 ProjectedActual* ItemCost Hydraulic Cylinders$300 Control Valve$125 Metal & Fabrication$3400 Misc Small Parts$200 Total$4,115 *Minus Testing Costs

Recommendations  Reroute Hydraulic Lines  Increase Blade Visibility  Offer Non-Rotating Model  Shield Exposed Hydraulic Lines

Acknowledgements  The Vassar Company  Larry Kimmel and Jack Vassar  Dr. Paul Weckler  Dr. John Solie  H. Clay Buford, P.E.  Wayne Kiner  Ron Dahlgren  Pioneer Equipment Rental  BAE Lab Staff  Robert Harshman

Questions