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Reel Theory

Reel Theory. John Deere. GOLF. &. TURF. Training Department. Reels Slide Index. (Left Click Selection Box). Four Principle Angle. Backlapping. Clearance Necessary. Total Cost of Mowing. Relief Angle. HOC. Milled Relief Blades. Bench Setting. Rake Angle. Effective Height of Cut.

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Reel Theory

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  1. Reel Theory John Deere GOLF & TURF Training Department

  2. Reels Slide Index (Left Click Selection Box) Four Principle Angle Backlapping Clearance Necessary Total Cost of Mowing Relief Angle HOC Milled Relief Blades Bench Setting Rake Angle Effective Height of Cut Bedknife Angles Prism Gauge Parallel Edges FOC Coned Shaped Reel Bedknife Attitude Dulling Curve Reel/Bed Relationship Dull Edges

  3. Reel Cutting Unit

  4. Clearance Necessary • .002” or .001” Clearance

  5. Four Principle Angles 1. Relief Angle 4. Top Angle 2. Rake Angle 3. Front Angle

  6. Reel Blade Relief Angle 20 Degree Relief Angle .040” (1 mm)

  7. Different Types of Relief Ground Relief Milled Relief

  8. Relief Ground / Sharp Bedknife (HP per unit) No Relief / Sharp Bedknife (HP per unit) % Increase in HP Consumed ( per unit ) Increase in HP Consumed per 3235 (5 units) Reel Load Comparison Reel-Bedknife Clearance .002” .005” Touch .75 .74 .88.87 .87 2.5916% 17.5% 294%0.6 hp 0.65 hp 8.55 hp * Tests Conducted While Mowing 1.5” Bermuda to 1.0” HOC

  9. Rake Angle Rake Angle

  10. Bedknife Angles Top Angle 5 Degrees (6.5 Greens Mower) Front Angle 5 Degrees Top Angle Front Angle

  11. Cutting Edges Must Be Parallel • The Reel Must Be Perfectly Straight and the Bedknife Must be Straight and Flat in Order for Them to Work Properly Reel Bedknife

  12. Cone Shaped Reel • Reels Can Become Cone- Shaped. This Causes a Great Deal of Strain on the Supporting Bearings When Adjusted Parallel to the Bedknife Reel Bedknife

  13. Dull Edges Edges Have Become Rounded… No Longer a Sharp Edge

  14. Backlapping Backlapping Compound with Reel Turning in Reverse Direction

  15. Cutting Unit Dulling Curve Sharp Optimum Cutting Quality Usable Cutting Quality Dull Elapse Time in Hours

  16. Backlapping Retains Optimum Cutting Quality Sharp Optimum Cutting Quality Usable Cutting Quality Dull Elapse Time in Hours

  17. Two Methods of Measuring HOC Bench Setting The Height at Which the Bedknife is Set Above a Firm Level Surface Effective Cutting Height The Actual Height at Which Grasses Are Cut Height of Cut (HOC)

  18. Distance Between Top of Bedknife and Bottom of Rollers Bench Setting

  19. Weight of the Cutting Unit and Attachments Every 10 lbs results in .005” height difference Soil Conditions Roller Shape andSurface Area Grass Type Effective Height of Cut

  20. Distance Traveled Between Consecutive Cuts Frequency Of Cut (FOC) Direction of Travel

  21. Number of Blades on Reel Reel Speed (RPM) Travel Speed FOC Factors

  22. FOC Too Slow (Higher Number) Marcelling (Wash Boarding)(Rippled Effect) FOC Too Fast (Lower Number) Over Stressed Grass Stripes and/or Brown Tips Accelerated Component Wear FOC Negative Effects

  23. Wash-boarding Rippling Marcelling ObjectionableCut Quality

  24. The Lower the Height of Cut (HOC)The More Blades That Are Required The Higher the HOCThe Less Blades That Are Required FOC “Guideline”

  25. Bedknife Attitude • Down • Level • Better Cut Quality • Better Stripe • Reduces Scuffing • Accurate Height of Cut Adjustment

  26. ESP Cutting Unit(Parallel Bedknife) Reel / Bedknife Relationship .78 MM 11.76 MM 48

  27. ESP Cutting Unit(Bedknife Angled Down 6MM) Reel / Bedknife Relationship 1.02 MM 13.43 MM 51

  28. Different Applications Require Greases with Characteristics that Meet Their Requirements All Greases Are NOT Created Equal Bushing and Shaft

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