How To Calibrate A Tar River Drill

🌾 Seed Drill Calibration Notes

Drill Width  (10 turns)

  • 78 inches(6.5 feet)

Drive Wheel

  • Diameter:15 inches•Circumference:15 in×π≈47 inches15 \, \text{in} × π ≈ 47 \, \text{inches}15in×π≈47inches

📐 Acreage & Wheel Rotations

  • 1 acre = 43,560 sq ft
  • Drill width = 6.5 ft
  • Linear feet per acre:

43,560÷6.5≈6,701 feet43,560 ÷ 6.5 ≈ 6,701 \, \text{feet}43,560÷6.5≈6,701feet

  • Total inches per acre:

6,701×12=80,412 inches6,701 × 12 = 80,412 \, \text{inches}6,701×12=80,412inches

  • Wheel rotations per acre:

80,412÷47≈1,710 rotations80,412 ÷ 47 ≈ 1,710 \, \text{rotations}80,412÷47≈1,710rotations

🔁 Calibration with 10 Wheel Turns

To make calibration easy:

  • 10 turns = 1/171 of an acre

1,710÷10=1711,710 ÷ 10 = 1711,710÷10=171

⚖️ Seed Weighing Steps

  1. Use a digital scale
  2. Place a catch bowl and tare (zero) the scale
  3. Turn the drive wheel 10 times
  4. Weigh the collected seed
  5. Multiply weight by 171=lb/acre seeding rate

🌾 Seed Drill Calibration Notes (20 turns)

Drill Width

  • 78 inches (6.5 feet)

Drive Wheel

  • Diameter:15 inches
  • Circumference: 15 in×π≈47 inches15 \, \text{in} \times \pi ≈ 47 \, \text{inches}15in×π≈47inches

📐 Acreage & Wheel Rotations

  • 1 acre = 43,560 sq ft
  • Drill width = 6.5 ft
  • Linear feet per acre:

43,560÷6.5≈6,701 feet43,560 ÷ 6.5 ≈ 6,701 \, \text{feet}43,560÷6.5≈6,701feet

  • Total inches per acre:

6,701×12=80,412 inches6,701 × 12 = 80,412 \, \text{inches}6,701×12=80,412inches

  • Wheel rotations per acre:

80,412÷47≈1,710 rotations80,412 ÷ 47 ≈ 1,710 \, \text{rotations}80,412÷47≈1,710rotations

🔁 Calibration with 20 Wheel Turns

To reduce effort:

  • 20 turns = 1/85.5 of an acre

1,710÷20=85.51,710 ÷ 20 = 85.51,710÷20=85.5

⚖️ Seed Weighing Steps

  1. Use a digital scale
  2. Place a catch bowl and tare (zero)the scale
  3. Turn the drive wheel 20 times
  4. Weigh the collected seed
  5. Multiply weight by85.5=lb/acre seeding rate

🌾 Seed Drill Calibration Notes (42.75 turns)

Drill Width:

  • 78 inches

Drive Wheel:

  • Diameter: 15 inches
  • Circumference: 15 in×π≈47 in15 \, \text{in} \times \pi \approx47 \, \text{in}15in×π≈47in

📐 Acreage & Wheel Rotations:

  • 1 acre = 43,560 sq ft
  • Drill width in feet: 78 in÷12=6.5 ft78 \, \text{in} ÷ 12 = 6.5 \, \text{ft}78in÷12=6.5ft
  • Linear feet per acre: 43,560÷6.5≈6,701 ft43,560 ÷ 6.5 ≈ 6,701 \, \text{ft}43,560÷6.5≈6,701ft
  • Inches per acre: 6,701 ft×12=80,412 in6,701 \, \text{ft} \times 12 = 80,412 \, \text{in}6,701ft×12=80,412in
  • Drive wheel rotations per acre: 80,412÷47≈1,710 rotations80,412 ÷ 47 ≈ 1,710 \, \text{rotations}80,412÷47≈1,710rotations

🔁 For Calibration:

  • To simulate 1/40th of an acre:
    1,710÷40≈42.75 wheel turns1,710 ÷ 40 ≈ 42.75 \, \text{wheel turns}1,710÷40≈42.75wheel turns

⚖️ Weighing Seeds

  1. Use digital scale
  2. Place bowl and tare (zero) the scale
  3. Weigh seed caught from 42.5 turns
  4. Multiply weight by 40 to get lb/acre rate