Clam Lake E n g i n e e r i n g - PowerPoint PPT Presentation

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

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Vassar currently offers 7, 10, 12, & 16' tree shears. Main focus is on 10' (SS-4) ... Rotation with a rack and pinion. Rotation with an lever arm ... – PowerPoint PPT presentation

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


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
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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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