Transcript Light Weight Fairway Mower FAB`s

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 )
17.5%
294%

Increase in HP Consumed per 3235 (5 units) 0.6 hp 0.65 hp 8.55 hp
16%
* Tests Conducted While Mowing 1.5” Bermuda to 1.0” HOC
Rake Angle
Rake Angle
Bedknife Angles
Top Angle
Top Angle 5 Degrees (6.5 Greens Mower)
Front Angle 5 Degrees
Front
Angle
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
Cone Shaped Reel
 Reels
Can
Become ConeShaped. This
Causes a Great
Deal of Strain on
the Supporting
Bearings When
Adjusted Parallel
to the Bedknife
Reel
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
Quality
Dull
Elapse Time in Hours
Backlapping Retains
Optimum Cutting Quality
Sharp
Optimum
Cutting
Quality
Usable
Cutting
Quality
Dull
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
Cutting Unit
(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