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Main switch (G): Turn on to activate DVR controls.
Mode-selection switch (H): Select normal mode
or education mode. Education mode provides
additional features which are explained below.
Figure 8-3: JWL-1840DVR mode switch
8.2.2 Education mode features
When education mode is selected, "EDUC" or
similar, will appear in the readout.
Auto braking: When main switch (C, Figure 8-2)
is turned off, the motor will brake to a stop within
seconds. (In normal mode, machine will coast to a
stop.) Also, if a chisel catches in the workpiece
auto braking will activate.
Auto idle: If machine detects no load after 4
minutes, "IDLE" will appear in readout. The user
can move any controls on headstock to continue
working. If no controls are touched after 1 minute,
lathe will shut off.
Start-up speed: To select a particular start-up
speed:
1.
Rotate speed dial (D, Figure 8-2) until desired
speed shows in readout.
2.
Press and hold speed dial for 10 seconds until
readout number flashes.
3.
Press speed dial again until number stops
flashing. When lathe is turned off and
restarted, it will start up at selected speed and
maintain it during operation.
9.0 Operation
The information which follows is general in nature
and not intended to be a complete course in
woodturning. Nothing can replace knowledge
gained by talking to experienced woodturners or
consulting books or trade magazines. Above all,
simple trial and error will aid in developing
proficiency in the craft.
9.1 Inspection
Before operating the lathe, check that everything is
in proper working order:
1.
Level your machine; use the leveling feet to
help reduce vibration.
2.
Check bearings; adjust only if endplay exists.
3.
Check belt; it should be snug but not overly
tight.
4.
Bed ways; keep clean, use steel wool to
remove any rust spots, and apply paste wax to
prevent buildup of rust and finishes.
5.
Tool rest; use a mill file to remove nicks and
dings.
6.
Spindle tapers; should be clean and free of
dust and chips for proper seating of tapers.
7.
Tailstock; clean and lubricate quill and locking
device.
8.
Lighting;
proper
eliminate shadows and reduce eye strain.
9.2 Turning Tools
If possible, select only good-quality, high-speed
steel turning tools. High-speed steel tools hold an
edge and last longer than ordinary carbon steel. As
one becomes proficient in turning, a variety of
specialty tools for specific applications can be
acquired. The following tools provide the basics for
most woodturning projects (see Figure 9-1):
Skews – 1-1/2" and 1" or 1-1/4", used to make
finishing cuts and details.
Large Roughing Gouge – 1" to 1-1/4", used to
eliminate waste wood.
Spindle Gouges – 1/4", 3/8", 1/2", used to turn
beads, coves and other details.
Deep Fluted Bowl Gouge – 1/4", 3/8" and 1/2",
used for turning bowls & plates.
Square Scraper (Bedan) – 3/8" or 1/2", used to
create square shoulders.
Large Round Nose (Domed) Scraper – 1-1/2",
used to reduce ridges on interior of bowls, round
edges of bowls, etc.
Parting Tool - 1/8", used for scraping, making a
cut-off, or to set diameters for sizing.
For safety and best performance, keep tools sharp.
If a tool stops cutting or requires excessive
pressure to make a cut, it needs to be sharpened.
A number of brand name sharpening jigs and
fixtures are available; however, a woodturner
should learn to sharpen tools freehand.
For best results, use a slow speed grinder (1800
rpm) fitted with a 60-grit aluminum oxide wheel (for
shaping) and a 100-grit alum. oxide wheel (for final
sharpening and touchup). The grinder should be
located near your lathe and at a comfortable
height. A diamond dresser will keep the wheels
true and eliminate glazing. Never allow the tool to
rest in one place on the wheel, keep it moving and
use a light touch.
16
lighting
is
essential
to
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