Post on 14-Dec-2015
Reel Theory
GOLFTURF
Training Department
&
John Deere
Four Principle Angle
Relief Angle
Milled Relief Blades
Rake Angle
Bedknife Angles
Parallel Edges
Clearance Necessary
Coned Shaped Reel
Dulling Curve
Dull Edges
Backlapping
Total Cost of Mowing
HOC
Bench Setting
Effective Height of Cut
Prism Gauge
FOC
Bedknife Attitude
Reel/Bed Relationship
(Left Click Selection Box)
Reel Cutting UnitReel Cutting Unit
Clearance NecessaryClearance Necessary .002” or .001”
Clearance
Four Principle AnglesFour Principle Angles
1. Relief Angle
3. Front Angle
4. Top Angle 2. Rake
Angle
Reel Blade Relief AngleReel Blade Relief Angle
20 Degree Relief Angle
.040” (1 mm)
Different Types of ReliefDifferent Types of Relief
Milled
Relief
Ground
Relief
Reel Load Comparison
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)
.002” .005” Touch
.75 .74 .88
.87 .87 2.59
16% 17.5% 294%
0.6 hp 0.65 hp 8.55 hp
* Tests Conducted While Mowing 1.5” Bermuda to 1.0” HOC
Reel-Bedknife Clearance
Rake AngleRake Angle
Rake Angle
Bedknife AnglesBedknife Angles
Front Angle
Top AngleTop Angle 5 Degrees (6.5 Greens Mower)
Front Angle 5 Degrees
Cutting Edges Must Be ParallelCutting 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
Cone Shaped ReelCone 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
Dull EdgesDull Edges
Edges Have Become Rounded…
No Longer a Sharp Edge
BacklappingBacklapping
Backlapping Compound with Reel Turning in Reverse Direction
Cutting Unit Dulling CurveCutting Unit Dulling Curve
Sharp
Dull
Elapse Time in Hours
Optimum Cutting Quality
Usable Cutting Quality
Backlapping Retains Optimum Cutting QualityBacklapping Retains Optimum Cutting Quality
Sharp
Dull
Elapse Time in Hours
Optimum Cutting Quality
Usable Cutting Quality
Height of Cut (HOC)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 SettingBench Setting
Distance Between Top of Bedknife and Bottom of Rollers
Effective Height of CutEffective 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)Frequency Of Cut (FOC)
Direction of Travel
Distance Traveled Between Consecutive Cuts
FOC FactorsFOC Factors
Number of Blades on Reel Reel Speed (RPM) Travel Speed
FOC Negative EffectsFOC 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
ObjectionableCut Quality
FOC “Guideline”FOC “Guideline”
The Lower the Height of Cut (HOC)The More Blades That Are Required
The Higher the HOCThe Less Blades That Are Required
Bedknife AttitudeBedknife Attitude
Down
Level Better Cut Quality Better Stripe Reduces Scuffing Accurate Height
of Cut Adjustment
Reel / Bedknife RelationshipReel / Bedknife Relationship
48
ESP Cutting Unit(Parallel Bedknife)
11.76 MM
.78 MM
Reel / Bedknife RelationshipReel / Bedknife Relationship
51
ESP Cutting Unit(Bedknife Angled Down 6MM)
13.43 MM
1.02 MM
All Greases Are NOT All Greases Are NOT Created EqualCreated Equal
All Greases Are NOT All Greases Are NOT Created EqualCreated Equal
Different Applications Require Greases with Characteristics that Meet Their Requirements
Bushing and Shaft