Lapping - Toro Reelmaster 5 Blade Operator's Manual

Figure 13
The land area and relief angle of reel blade are pointed out
in figure 14. The land area is that part of the reel blade that
actually comes in contact with the bedknife and cuts the
grass in a scissors action. The relief or back grind angle is
ground into reel blade to provide clearance or relief be–
hind contacting edges to reduce drag or friction.
Recommended relief angle is 15 degrees.
Figure 14
Note: After a reel has run for an extended period of time
the blade contact point or land area will keep getting wider
and eventually will be full blade width. This is normal and
does not mean that the reel has to be reground to stay
effective. A cutting unit can cut effectively with full width
blades if the adjustment is checked frequently to maintain
sharp cutting edges.
After reel and bedknife have been ground, perform the
following adjustments:
1. Set Height–of–Cut, page 7.
2. Parallel Bedknife to Reel, page 6.
Note: As the reel blades continue to run against the
bedknife a slight burr will appear on the front cutting edge
surface the full length of the bedknife. If a file is
occasionally run across the front edge to remove this burr,
improved cutting can be obtained.
If the reel blade edges and bedknife edge are slightly
rounded and do not have severe nicks, lapping only with a
lapping compound may restore the edges and match.
Oftentimes a mower is deemed by users to need grinding
when reel bearing adjustment, bedknife adjustment and/or
lapping is all that is necessary.

Lapping

Mowers are set up as follows:
1. Remove the right hand wheel.
2. Place wheel under gear case for support.
3. Remove the reel pinion cover (Fig. 15).
Figure 15
1. Reel pinion cover
4. Disengage the reel.
5. Connect the lapping machine coupler to the nut on the
end of the reel shaft.
When lapping, use a good grade of commercial lapping
compound. A medium grit should be for initial lapping and
a fine grit for finishing. A solution of one part liquid
detergent and two parts lapping compound is
recommended. The liquid detergent greatly eases washing
away the compound when finished. Water soluble oil may
also be used as a compound carrier.
Note: Lapping solution must be kept in free flowing
condition to get even distribution on bedknife and reel.
The lapping procedure is as follows:
1. Adjust bedknife to reel so light contact is evident.
2. Operate the lapping machine so the reel turns in a
reverse direction. Apply lapping solution continuously
and maintain light bedknife to reel contact.
3. Stop lapping machine periodically to check cutting
surfaces for sharpness. Continue lapping until sharp
cutting edges have been restored.
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