Clam Lake E n g i n e e r i n g Vassar Tree Shear Project.
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Clam LakeClam LakeE n g i n e e r i n gE n g i n e e r i n g
Vassar Tree Shear ProjectVassar Tree Shear Project
Clam LakeClam LakeE n g i n e e r i n gE n g i n e e r i n g
Clint CosgroveClint Cosgrove Matt LemmonsMatt Lemmons Lance KlementLance Klement Kevin TaylorKevin Taylor
CLAm
La
Ke
Vassar EquipmentVassar Equipment
Family Owned Family Owned Located in PerkinsLocated in Perkins Vast Array of ProductsVast Array of Products
Tree ShearsTree Shears
SimpleSimple
EffectiveEffective
SafeSafe
Current DesignCurrent 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
History of Customer ServiceHistory of Customer Service
Rigorous testing at demonstrationsRigorous testing at demonstrations
Shears withstand much abuse by customersShears withstand much abuse by customers
Vassar believes in their product, 2/3 cost Vassar believes in their product, 2/3 cost reimbursement for trade-in upgradesreimbursement for trade-in upgrades
Very few failuresVery few failures
Customer RequirementsCustomer Requirements
Frame RotationFrame Rotation Manual RotationManual Rotation
Flush CuttingFlush Cutting Blades sitting on floorBlades sitting on floor Customer appealCustomer appeal
Customer RequirementsCustomer Requirements
New FeaturesNew Features
Simplified FrameSimplified Frame Less partsLess parts
Reshaping frame to align cylinders Reshaping frame to align cylinders with bladeswith blades
Customer RequirementsCustomer Requirements
LimitationsLimitations 10 inch tree shear weight under 10 inch tree shear weight under
1100 lbs.1100 lbs.
Brush guard remain intactBrush guard remain intact
Withstand 3000 psi hydraulic Withstand 3000 psi hydraulic pressurepressure
Engineering SpecificationsEngineering Specifications
DimensionsDimensions Allow a 10 in tree to fit between bladesAllow a 10 in tree to fit between blades
Length of implement must be Length of implement must be minimizedminimized
Height of the frame remains the sameHeight of the frame remains the same
Engineering SpecificationsEngineering Specifications
ForcesForces shearing forces on the tree from shearing forces on the tree from
hydraulic rams and impact forceshydraulic rams and impact forces
40,000 lbs. from rams40,000 lbs. from rams
impact loading of 14,000 lbs.impact loading of 14,000 lbs.
Engineering SpecificationsEngineering Specifications
Other ConsiderationsOther Considerations WeightWeight
Angle of rotationAngle of rotation
User-friendly?User-friendly?
Patent SearchesPatent Searches
Most patents cover industrial logging implements
Attention is on gripping the tree
Others covered boom-mounted shears
These designs were more like “loppers”
Patent SearchesPatent 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
The CompetitionThe CompetitionDymax Inc.
Only uses one shear blade
May make non-uniform cuts
Mount is not the sameSkid Steer Solutions
Only uses one shear blade
Rotational, but with hydraulics
No known patents
The CompetitionThe Competition
Grace Manufacturing
Frame is not curved
Hydraulic cylinders close to 45o
No rotation
No patents pending
CostCost
MaterialsMaterials ManufacturingManufacturing In House/ Send OutIn House/ Send Out
User FriendlinessUser Friendliness
Regular UseRegular Use
MaintenanceMaintenance
StrengthStrength
CuttingCutting
ImpactImpact
FatigueFatigue
Considerations for Considerations for RotationRotation
RequirementsRequirements– Low Rotational SpeedLow Rotational Speed
– Must Support the Shear WeightMust Support the Shear Weight
– Low CostLow Cost
– Easily ManufacturedEasily Manufactured
Considerations For RotationConsiderations For Rotation
Hydraulic/Electric RotationHydraulic/Electric Rotation– Rotation with a hydraulic cylinderRotation with a hydraulic cylinder
Rotation with a rack and pinionRotation with a rack and pinion Rotation with an lever armRotation with an lever arm
– Rotation with a hydraulic/electric motorRotation with a hydraulic/electric motor
**All require more than one hydraulic circuitAll require more than one hydraulic circuit
Rotation by handRotation by hand
Possible Designs-Rotation Possible Designs-Rotation MechanismMechanism
BearingsBearings– ExpensiveExpensive– Require Low TolerancesRequire Low Tolerances
Drive RollersDrive Rollers– Low Low
DOM TubingDOM Tubing– Almost Unlimited Amount of SizesAlmost Unlimited Amount of Sizes– Appropriate Wall ThicknessAppropriate Wall Thickness– Cost EffectiveCost Effective
Possible Designs-FramePossible Designs-Frame
Four Piece Four Piece FrameFrame– Less PartsLess Parts
– Max Cylinder Max Cylinder ForceForce
– Manual Manual RotationRotation
Possible Designs-FramePossible Designs-Frame
Three Piece Three Piece FrameFrame– Less PartsLess Parts
– Maximum Maximum Cylinder ForceCylinder Force
– Flush CutFlush Cut
AcknowledgementsAcknowledgements The Vassar CompanyThe Vassar Company
Larry Kimmel and Jack VassarLarry Kimmel and Jack Vassar
Dr. Paul WecklerDr. Paul Weckler
H. Clay Buford, P.E.H. Clay Buford, P.E.
Wayne KinerWayne Kiner
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