Light Weight Fairway Mower FAB

							Reel Theory

    John Deere
       GOLF
          &

       TURF
 Training Department
                       (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
Reel Cutting Unit
Clearance Necessary
                 .002”or .001”
                  Clearance
     Four Principle Angles

                           1. Relief
                           Angle




4. Top
Angle
                             2. Rake
                             Angle



          3. Front Angle
Reel Blade Relief Angle




                     20 Degree
                     Relief Angle
           .040”
          (1 mm)
Different Types of Relief




       Ground        Milled
       Relief        Relief
            Reel Load Comparison
                                                 Reel-Bedknife Clearance
                                                  .002” .005” Touch

   Relief Ground / Sharp Bedknife (HP per unit) .75      .74      .88

   No Relief / Sharp Bedknife    (HP per unit) .87       .87     2.59

   % Increase in HP Consumed     ( per unit )    16%    17.5%    294%

   Increase in HP Consumed per 3235 (5 units) 0.6 hp 0.65 hp 8.55 hp


    * Tests Conducted While Mowing 1.5” Bermuda to 1.0” HOC
Rake Angle




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




            Front
            Angle
Cutting Edges
Must Be Parallel
   The Reel Must
   Be Perfectly         Reel
   Straight and the
   Bedknife Must
   be Straight and
   Flat in Order for
   Them to Work
   Properly            Bedknife
Cone Shaped Reel

  Reels Can
  Become Cone-         Reel
  Shaped. This
  Causes a Great
  Deal of Strain on
  the Supporting
  Bearings When
  Adjusted Parallel   Bedknife
  to the Bedknife
Dull Edges
    Edges Have
    Become
    Rounded…


    No Longer
    a Sharp
    Edge
Backlapping

   Backlapping
   Compound
   with Reel
   Turning in
   Reverse
   Direction
 Cutting Unit Dulling Curve

Sharp                          Optimum
                               Cutting
                               Quality

                               Usable
                               Cutting
Dull                           Quality

        Elapse Time in Hours
 Backlapping Retains
 Optimum Cutting Quality

Sharp                          Optimum
                               Cutting
                               Quality

                               Usable
                               Cutting
Dull                           Quality

        Elapse Time in Hours
Height of Cut (HOC)

   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
Bench Setting

  Distance Between
   Top of Bedknife
   and Bottom of
   Rollers
 Effective Height of Cut

 Weight of   the Cutting Unit and Attachments
  Every 10 lbs results in .005” height difference
 Soil Conditions
 Roller Shape   and
  Surface Area
 Grass Type
Frequency Of Cut (FOC)
  Distance Traveled Between
   Consecutive Cuts
      Direction of Travel
FOC Factors

  Number of Blades on Reel
  Reel Speed (RPM)
  Travel Speed
FOC Negative Effects

  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
Marcelling

   Wash-boarding
   Rippling




                    Objectionable
                    Cut Quality
FOC “Guideline”

  The Lower the Height of Cut (HOC)
   The More Blades That Are Required

  The Higher the HOC
   The Less Blades That Are Required
Bedknife Attitude

   Down




   Level
    Better Cut Quality
    Better Stripe
    Reduces Scuffing
    Accurate Height
     of Cut Adjustment
    Reel / Bedknife Relationship
             ESP Cutting Unit
             (Parallel Bedknife)




.78 MM


               11.76 MM
                                   48
    Reel / Bedknife Relationship
             ESP CuttingUnit
             (Bedknife Angled Down 6MM)




1.02 MM


               13.43 MM
                                    51
             All Greases Are NOT
                 Created Equal




                                             Bushing and
                                             Shaft
   Different Applications Require Greases with Characteristics
                    that Meet Their Requirements