SMALL FARM SUBSOILER final presentation USDA SPONSERED SENIOR DESIGN PROJECT Jason Lueck Matt Maples John McBride Brad Mooney Manuel Pagan DESIGN REQUIREMENTS Scaled to work on a small farm Low cost to purchase under 3000 final cost Able to penetrate at least 10 15 preferred Modify an existing tiller Troy Bilt Horse Surface soil left undisturbed Proposed Ideas Straight Rotary Shank Chisel Trencher Problems With Proposed Ideas Rotary Chisel More expensive than straight shank Not feasible using the 8HP Troy Bilt Horse may be feasible with more powerful walkbehind tractors Trencher Very expensive compared to other options Slow forward speed Least reliable Future Proposals for Rotary Chisel Hercules Series 850 Tractor Hercules Series 946 Tractor Engine 14 HP Briggs Stratton or 12 HP Kohler Transmission 3 Forward Speeds 3 Reverse Speeds Max Tilling Width 30 Max Tilling Depth 8 2950 Engine 14 HP B S Vanguard series Transmission 3 Forward Speeds 3 Reverse Speeds Max Tilling Width 34 Max Tilling Depth 8 Approx 4200 Reasons for Shank Shank Chisel Trencher Cost Least Expensive Expensive Most Expensive Ease of Design Least Design Most Design Work Work Some Design Work Safety Very Safe Safe Least Safe Reasons for Shank Shank Maintenance Low Maint Chisel Trencher Mid range Maint Most Maint Reliability Most reliable Reliable Least Reliable Efficiency Least Efficient Comparable Comparable Troy Bilt HORSE Troy Bilt Physical Information Weight 225 lbs without PTO attachments Center of Mass Location Horizontal 3 125 in Front of Axle Vertical 7 Above the Axle Tires Current 15 Diameter Rubber Future 18 Cage Wheels Troy Bilt Physical Information Center of mass location Troy Bilt Engine Information Engine Specifications 8 HP Briggs Stratton PowerBuilt Max torque 10 9 ft lbs 2800 RPM s Max RPM 3600 RPM s Continuous operation RPM 3000 RPM s Troy Bilt Engine Information Torque Curve 11 10 9 Torque ft lbs 10 8 10 7 10 6 10 5 10 4 10 3 10 2 10 1 10 1800 2000 2200 2400 2600 2800 RPM torque curve 3000 3200 3400 3600 Troy Bilt Engine Information HP vs RPM 8 5 8 7 5 HP 7 6 5 6 5 5 5 4 5 4 1800 2000 2200 2400 2600 2800 3000 RPM Recommended Max 3200 3400 3600 Troy Bilt Transmission Information 2 x 2 Speed forward Reverse 2 Belt Settings From Engine Shaft to Drive Shaft 2 Gear Speeds From Drive Shaft to Axle Goes Through a Worm Gear Before a Set of Helical Gears Reverse Friction Plates Attached to Belt Pulleys Troy Bilt Transmission Information Troy Bilt Transmission Information Gear Ratios 1st Gear 2st Gear High Speed Belt Position 216 1 89 1 Low Speed Belt Position 290 1 120 1 Proposed Attachments to Troy Bilt HORSE Shank With Coulter Large Coulter Disc Proposed Shank Designs Raked Shank Curved Shank Straight Shank Coulter Design Coulter Specs Diameter 13 5 Cutting Depth 3 375 Bearings on Axle Adjustable Horizontal Positioning Toolbar Design Toolbar Specs Length 15 Material 1 5 Square Tubing 0 25 wall thickness Adjustable Shank Angle Adjustable Shank Depth Design Problems for Shank Avoiding Adherence Loss Solutions Add Cage Wheels Add Wheel Weights Add Weight to Front of Tiller Design Solutions Add Weight to Front of Tiller Cage Wheels and Wheel Weights Current Cage Wheels Will Be Modified Redesigned Hub Able to Carry Extra Weights Wheel Weights Regular Iron Lifting Weights Cheap and Available Large Coulter Design Problem and Solution Inserting Coulter Disc into Ground Requires Approximately 400 lbs of Downward Force Solution Add Large Weights Disc Assembly Weight 100 lbs Weight Added to Toolbar 300 lbs Large Coulter Disc Design Large Coulter Specifics Diameter 36 Cutting Depth 9 Moveable Toolbar Ease of Transport Force Analysis Assumptions Concentrated Load 15 Underground Only Shank No Coulter Steady State Operation No Acceleration C2 h2 C0 W4 h0 C4 W2 W0 C1 r W1 Ph c W3 hs h3 a Pv Sv Sh b d g h4 Engine s Traction Force Traction force in high gear with rubber tires 0 55 rubber on dirt and with cage wheels 0 65 0 75 cage wheel on dirt Angle and Weight Changes Varying angle of operation between 10 and 10 degrees Weights 180 80 80 80 80 180 50 per wheel Cage wheels 0 75 Testing Needs Most available information is based on large scale equipment Small scale equipment information is estimated from large scale results Little known information on single shank forces Little known information on advantages of small leading coulter discs Testing Options Strain Gages Solid bar stock extension to toolbar Milled for higher elasticity Load Pins Replace bolts in toolbar with load pins Testing Options Comparisons Strain Gages Less Accurate More setup work Calibration Attaching Gages Affordable under 50 Load Pins Very Accurate Little setup work Data Collection Program Install as a Bolt Expensive 750 Project Cost Analysis Item Troy Bilt HORSE Cage Wheels Cage Wheel Hubs Toolbar PTO Mount Shank Toolbar Curved Shank Raked Shank Straight Shank Angle Adjuster L Bracket Front Weight Mount 80 lb Weight 25 lb Weight Small Coulter Disc Small CD Mount Large Coulter Disc Large Coulter Toolbar Strain Gage Mount Strain Gages Datalogger Material Needed 25 Steel 25 Steel 1 Solid Round 1 5 Square Tubing 375 Steel 375 Steel 375 Steel 2 x4 Tubing 25 Steel 2 x4 Tubing 1 5 Square Tubing 1 Solid Square Stock Quantity 1 2 2 1 2 1 1 1 1 1 1 2 4 1 1 1 1 1 2 1 Cost 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 44 00 0 00 0 00 0 00 0 00 0 00 30 00 0 00 Raw Materials Nuts Bolts etc 25 Steel Plate 375 Steel Plate 1 5 Square Tubing 2 x 4 Rect Tubing 1 Square Stock Steel 2 25 Round Stock Steel Amount 2 sq ft 8 sq ft 8 ft 1 ft 1 ft 1 ft 30 00 30 00 130 00 40 00 15 00 35 00 27 00 Total Load Pin optional 381 00 1 750 00 QUESTIONS