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Clam Lake E n g i n e e r i n g

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. Vassar Equipment. Family Owned Located in Perkins Vast Array of Products. Tree Shears. Simple Effective Safe.

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Clam Lake E n g i n e e r i n g

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  1. Clam LakeE n g i n e e r i n g Vassar Tree Shear Project

  2. Clam LakeE n g i n e e r i n g • Clint Cosgrove • Matt Lemmons • Lance Klement • Kevin Taylor CL Am La Ke

  3. Vassar Equipment • Family Owned • Located in Perkins • Vast Array of Products

  4. Tree Shears • Simple • Effective • Safe

  5. Current Design • Vassar currently offers 7, 10, 12, & 16” tree shears • Main focus is on 10” (SS-4) • Main frame is ½” steel plate • No rotation • Blades not flush with the ground

  6. History of Customer Service • Rigorous testing at demonstrations • Shears withstand much abuse by customers • Vassar believes in their product, 2/3 cost reimbursement for trade-in upgrades • Very few failures

  7. Customer Requirements Frame Rotation • Manual Rotation Flush Cutting • Blades sitting on floor • Customer appeal

  8. Customer Requirements New Features Simplified Frame • Less parts • Reshaping frame to align cylinders with blades

  9. Customer Requirements Limitations • 10 inch tree shear weight under 1100 lbs. • Brush guard remain intact • Withstand 3000 psi hydraulic pressure

  10. Engineering Specifications Dimensions • Allow a 10 in tree to fit between blades • Length of implement must be minimized • Height of the frame remains the same

  11. Engineering Specifications Forces • shearing forces on the tree from hydraulic rams and impact forces • 40,000 lbs. from rams • impact loading of 14,000 lbs.

  12. Engineering Specifications Other Considerations • Weight • Angle of rotation • User-friendly?

  13. Patent Searches • Most patents cover industrial logging implements • Attention is on gripping the tree • Others covered boom-mounted shears • These designs were more like “loppers”

  14. Patent Searches • Design uses oscillatory movement • Cylinder placement and frame shape are much different • Contains a C-shaped frame • Patent is for blade angle, also does not sit flush with ground

  15. The Competition • Dymax Inc. • Only uses one shear blade • May make non-uniform cuts • Mount is not the same • Skid Steer Solutions • Only uses one shear blade • Rotational, but with hydraulics • No known patents

  16. The Competition • Grace Manufacturing • Frame is not curved • Hydraulic cylinders close to 45o • No rotation • No patents pending

  17. Cost • Materials • Manufacturing • In House/ Send Out

  18. User Friendliness • Regular Use • Maintenance

  19. Strength • Cutting • Impact • Fatigue

  20. Considerations for Rotation • Requirements • Low Rotational Speed • Must Support the Shear Weight • Low Cost • Easily Manufactured

  21. Considerations For Rotation • Hydraulic/Electric Rotation • Rotation with a hydraulic cylinder • Rotation with a rack and pinion • Rotation with an lever arm • Rotation with a hydraulic/electric motor *All require more than one hydraulic circuit • Rotation by hand

  22. Possible Designs-Rotation Mechanism • Bearings • Expensive • Require Low Tolerances • Drive Rollers • Low • DOM Tubing • Almost Unlimited Amount of Sizes • Appropriate Wall Thickness • Cost Effective

  23. Possible Designs-Frame • Four Piece Frame • Less Parts • Max Cylinder Force • Manual Rotation

  24. Possible Designs-Frame • Three Piece Frame • Less Parts • Maximum Cylinder Force • Flush Cut

  25. Acknowledgements • The Vassar Company • Larry Kimmel and Jack Vassar • Dr. Paul Weckler • H. Clay Buford, P.E. • Wayne Kiner

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