Ryobi RE180PL1 Manual de usuario descargar pdf (Pagina 19)

OPERATION

RATE OF FEED

IMPORTANT: The “secret” of professional routing and

edge shaping lies in making a careful set-up for the cut

and in selecting the proper rate of feed.

The proper rate of feed depends on several factors: the

hardness and moisture content of the wood, the depth of

cut, and the cutting diameter of the bit. When cutting

shallow grooves in soft woods such as pine, a faster rate

of feed can be used. When making deep cuts in

hardwoods such as oak, a slower rate of feed should be

used.

The best rate of feed is one that does not slow down the

router motor more than one-third of its no-load speed. If

the router is fed too fast, it will take large chips out of the

wood and leave gouge marks. If the router is fed too

slow, it will scorch or burn the wood.

Feeding Too Fast

Clean, smooth routing and edge shaping can be done

only when the bit is revolving at a relatively high speed

and is taking very small bites to produce tiny, cleanly

severed chips. If your router is forced to move forward

too fast, the RPM of the bit becomes slower than normal

in relation to its forward movement. As a result, the bit

must take bigger bites as it revolves. “Bigger bites” mean

bigger chips, and a rougher finish. Bigger chips also

require more power, which could result in the router

motor becoming overloaded.

Under extreme force-feeding conditions the relative

RPM of the bit can become so slow — and the bites it has

to take so large — that chips will be partially knocked off

(rather than fully cut off), resulting in splintering and

gouging of the workpiece.

See Figure 21.

Your router is an extremely high-speed tool (15,000 -

23,000 RPM no-load speed), and will make clean, smooth

cuts if allowed to run freely without the overload of a

forced (too fast) feed. Three things that cause “force

feeding” are bit size, depth-of-cut, and workpiece

characteristics. The larger the bit or the deeper the cut,

the more slowly the router should be advanced. If the

wood is very hard, knotty, gummy or damp, the operation

must be slowed still more.

You can always detect “force feeding” by the sound of

the motor. Its high-pitched whine will sound lower and

stronger as it loses speed. Also, the strain of holding the

tool will be noticeably increased.

Feeding Too Slow

It is also possible to spoil a cut by moving the router

forward too slowly. When it is advanced into the work too

slowly, a revolving bit does not dig into new wood fast

enough to take a bite; instead, it simply scrapes away

sawdust-like particles. Scraping produces heat, which

can glaze, burn, or mar the cut and in extreme cases, can

even overheat the bit so as to destroy its hardness.

Fig. 21

In addition, it is more difficult to control a router when the

bit is scraping instead of cutting. With practically no load

on the motor the bit will be revolving at close to top RPM,

and will have a much greater than normal tendency to

bounce off the sides of the cut (especially if the wood has

a pronounced grain with hard and soft areas). As a

result, the cut produced may have rippled, instead of

straight sides.

See Figure 21.

“Too-slow feeding” can also cause your router to take off

in a wrong direction from the intended line of cut. Always

grasp and hold your router firmly with both hands

when routing.

You can detect “too-slow feeding” by the runaway, high-

pitched sound of the motor; or by feeling the “wiggle” of

the bit in the cut.

TOO FAST

TOO SLOW

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