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RATEOFFEED(Figs.17and17a)
Theproperrate ofteed depends onseveral factors:the hardnessand moisture content
of theworkplace,the depth of cut, and the cutting dEameterof the bit, Whenyou are
cuttingshaliow groovesIn softwoodssuchas pine, you may use a faster rateof feed,
When making deep cutstn hardwoodssuch as oak, you should use a slower rateof feed_
FEEDINGTOO FAST (Fig. 17)
r"J_B_t
Clean and smooth finished cutscan only ! _1Shank
be,achieved when thecutter bitis rotating
m..r,z r_,,_ = =
at a retat{valyhighspeed, takingveryemaff "'_"- v_'" I I
bites, producingtiny,cleancut chips.
Fumingthe feed of the cutter bit forwardtoo
fast slowsthe RPM ofthe cutterbit, and the bit
takesbigger bites as It rotates,Biggerbites
mean biggerchipsand a roughfinish, TOO FAST cutter
This forcing acUoncan also cause the
routermotortooverheaL
Under extremeforce-feeding conditions,the RPMs can becomeso slow and the bites
become so large that chipsbecome partiallycut off,causingsplintering and gouging
oftheworkpiece_
The muterwillmake crean,smoothcutsIfallowedtorunfreelywithouttheovedoadof
forced feeding. You can detect forced feeding by the soundof the motor, its usual
hfgh-pRchedwhinewitrsoundlowerand strongeras it losesspeed. Holdingthe router
against theworkplacewiltalsobe strained and harder todo_
FEEDING TOO SLOW (Fig. 17n)
When you feed theculterbit too slowly,
the rotatingcutterbit does notcut Into
new woodfast enough 1otake a bite,
Instead, it scrapes away sawdusFIIke
partlcles.Thisscraping produces heat,
whichcan glaze, bum and mar the cut
in theworkpleceend, in extreme cases,
overheatthe cutterbit,
When the cutterbit IsscrapingInstead
of cuffing,the muterismore difficult to
controlas you feed it,
r-j_B_t
F_ll hank
Cutter
TOOSLOW
With almostno toed on the motor, the cutterbtl has a tendencytobounceoffthe sides of
the cut Inthe workplace,producinga cutwith a rippledfinishInstead of cleanstraight sides.
27
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