2. HARVEST EQUIPMENT
SMALL TO MEDIUM
• Hand Harvest
• Buckets, bins, blades,
bags, scissors, pruners,
weed wacker, bill hook
• Machine Harvest
• Hand held seed stripper
• Modified weed wacker
• www.prairiehabitats.com
3. HARVEST EQUIPMENT
MEDIUM TO LARGE
• Pull-type sweep harvester
• www.prairie habitats.com
• www.seedburo.com
• Pull-type combine
• PTO driven
• Allis Chalmers
• $2500 -$8500
• Combine
• $250,000 & head
• Plot combine more $
10. I-TECH MODIFIED CHIPPER SHREDDER
GRAIN THRESHER – MEDIUM SCALE
• Creating a Grain
Thresher
• By Allen Dong and
Roger J. Edberg, I-Tech,
P.O. Box 413, Veneta,
Oregon 97487
This invention was
declared public
domain August 1994, a
gift to humanity.
$50 - $3000 to build
13. MODIFY RPM BY SEED TYPE
• 250-400 rpm for
beans and large
seeds
• 400-800 rpm
coriander, radish,
sunflower
• 600-1400 rpm
wheat, oats, barley,
rice and small seeds
14. TYPICAL THRESHING RATES
Pounds of seeds per
hour
• Amaranth 66
• Bok Choy 22 to 30
• Oats 94
• Pinto bean 117
• Soy bean 81 to 127
15. THRESHING EQUIPMENT
LARGE SCALE
Portable belt thresher new $10 -15,000
Photo credit: Micaela Colley,
Organic Seed Alliance.
Photo credit: Micaela Colley,
Organic Seed Alliance
All Crop stationary field thresher
Allis Chalmers
31. SEED CLEANING BY SIZE
SMALL SCALE
Screens and hardware cloth Deep fryer baskets.
32. SEED CLEANING
SMALL – MEDIUM SCALE
Hoffman Manufacturing www.hoffmanmfg.com
Seedburo www.seedburo.com
$40-$48 US$8 - $15 US
33. SCREEN THEORY
• Top screen removes
larger debris
• Bottom screen
retains seed and
allows fine debris to
fall through
34. SCREEN SHAPES AND SIZES
http://www.atferrell.com/clipper/products/clipper-office-tester
for common screen sizes for seed by type ( tomato, pepper, bean etc.)
The Seed Garden, The Art an Practice of Seed Saving
1/20 screen
Round holes 1/20th of
an inch in diameter
11/64 screen
Round holes 11/64th of
an inch in diameter
35. 11/64 x ¾ screen
Slot or oval shaped holes that in one
dimension is ¾ inch and the other is
11/64 inch
36. 6 x 20 screen
Wire mesh screen with 6 wires/inch in one
direction and 20 wires/inch in the other
39. SMALL MODEL CLIPPERS
Clipper Pacer
Manual Seed
Cleaner
• Pedal powered
• Conversion kit
• 50 bushels/hour
Clipper 334
• 3 screens
• $15,000 US
• 120 -250 bushels/hr.
Seed cleaning room at Fedco
40. CLEANING SEED BY WEIGHT
(SPECIFIC GRAVITY)
• Air /Wind
• Hand held hair
dryer with cool
setting
• Air compressor
• Fans of all sizes
• Shop Vac
• Air columns
• Gravity table