Dremel 4200 - Manual (Page 17)

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direction causes the cutting edge of the bit to climb out of the work and
pull the tool in the direction of this feed.
e. When using rotary files, cut-off wheels, high-speed cutters or
tungsten carbide cutters, always have the work securely clamped.
These wheels will grab if they become slightly canted in the groove,
and can kickback. When a cut-off wheel grabs, the wheel itself usually
breaks. When a rotary file, high-speed cutter or tungsten carbide cutter
grabs, it may jump from the groove and you could lose control of the tool.
SAFETY WARNINGS SPECIFIC FOR
GRINDING AND ABRASIVE CUTTING-OFF
OPERATIONS
a. Use only wheel types that are recommended for your power tool
and only for recommended applications. For example: do not grind
with the side of a cut-off wheel. Abrasive cut-off wheels are intended
for peripheral grinding, side forces applied to these wheels may cause
them to shatter.
b. For threaded abrasive cones and plugs use only undamaged
wheel mandrels with an unrelieved shoulder flange that are of
correct size and length. Proper mandrels will reduce the possibility of
breakage.
c. Do not "jam" a cut-off wheel or apply excessive pressure. Do not
attempt to make an excessive depth of cut. Overstressing the wheel
increases the loading and susceptibility to twisting or snagging of the
wheel in the cut and the possibility of kickback or wheel breakage.
d. Do not position your hand in line with and behind the rotating
wheel. When the wheel, at the point of operation, is moving away from
your hand, the possible kickback may propel the spinning wheel and the
power tool directly at you.
e. When wheel is pinched, snagged or when interrupting a cut
for any reason, switch off the power tool and hold the power tool
motionless until the wheel comes to a complete stop. Never attempt
to remove the cut-off wheel from the cut while the wheel is in
motion otherwise kickback may occur. Investigate and take corrective
action to eliminate the cause of wheel pinching or snagging.
f. Do not restart the cutting operation in the workpiece. Let the
wheel reach full speed and carefully re-enter the cut. The wheel may
bind, walk up or kickback if the power tool is restarted in the workpiece.
g. Support panels or any oversized workpiece to minimize the risk
of wheel pinching and kickback. Large workpieces tend to sag under
their own weight. Supports must be placed under the workpiece near
the line of cut and near the edge of the workpiece on both sides of the
wheel.
h. Use extra caution when making a "pocket cut" into existing walls
or other blind areas. The protruding wheel may cut gas or water pipes,
electrical wiring or objects that can cause kickback.
SAFETY WARNINGS SPECIFIC FOR WIRE
BRUSHING OPERATIONS
a. Be aware that wire bristles are thrown by the brush even during
ordinary operation. Do not overstress the wires by applying
excessive load to the brush. The wire bristles can easily penetrate light
clothing and/or skin.
b. Allow brushes to run at operating speed for at least one minute
before using them. During this time no one is to stand in front or in
line with the brush. Loose bristles or wires will be discharged during the
run-in time.
c. Direct the discharge of the spinning wire brush away from you.
Small particles and tiny wire fragments may be discharged at high
velocity during the use of these brushes and may become imbedded in
your skin.
PREPARATION
Always unplug the tool from the power source before you make
any adjustments, change accessories, service, clean, etc. This
reduces the risk of starting the tool accidentally.
FIRST USE
The carbon brushes in your tool have been engineered for many hours
of dependable service. To prepare the brushes for use, run the tool at full
speed for 5 minutes under no load. This will properly "seat" the brushes,
and extend the life of the tool.
CHANGING COLLETS
Four different size collets are available for your multitool, to
accommodate different shank sizes. Always use the collet which
matches the shank size of the accessory you plan to use. Never force a
larger diameter shank into a collet. Collet sizes can be identified by the
rings on the back end of the collet. Refer to figure 2.
• 3.2mm / 1/8" Collet with no rings
• 2.4mm / 3/32" Collet with three rings (not included)
• 1.6mm / 1/16" Collet with two rings (not included)
• 0.8mm / 1/32" Collet with one ring (not included)
Use 4200 specific collets only. You can order the collets through
the Dremel Service Center or go to www.dremel.com.
1. Remove a collet (J) from the EZ Change™ chuck (I). Refer to figure
3 and 4.
a. Use needle nose pliers to lightly depress the finger (L) of the
collet until it is clear of the detent feature (K).
b. Pull and hold both EZ Change™ levers to the back (unlock).
c. Pull the collet free from the chuck.
d. Release the EZ Change™ levers.
2. Install a new collet by inserting the narrow end of the new collet
completely into the EZ Change™ chuck.
The fingers (L) of the collet must be aligned with the detents (K)
of the EZ Change™ chuck to be fully inserted.
CHANGING ACCESSORIES
Your Dremel 4200 is equipped with the EZ Change™ mechanism. It
allows you to quickly and easily change accessories without the use of
a wrench.
Use only Dremel tested, high performance accessories! You can
order accessories through the Dremel Service Center or go to
www.dremel.com.
Use the EZ Speedclic to easily install and remove EZ SpeedClic
accessories. Refer to figure 10.
Do not operate the EZ Change™ levers while the multitool is
running as the bit may be ejected.
1. Remove an accessory. Refer to figure 5.
a. Pull and hold both EZ Change™ levers to the back (1) as far as
they will go.
b. Remove the accessory (2).
2. Install an accessory. Refer to figure 5.
a. Pull and hold both EZ Change™ levers to the back (1) as far as
they will go.
b. Insert the accessory into the collet as far as possible (2) to
minimize runout and unbalance.
c. Release the EZ Change™ levers (3).
d. Press the EZ Change™ levers to the front (lock) to fully secure
the bit.
Make sure the accessory is properly secured. Loose
accessories can unexpectedly shift or eject, causing loss of
control. Always use the collet which matches the shank size of
the accessory you plan to use.
If slipping of the accessory occurs, while in use, the tool needs
service.
e. Position yourself and bystanders away from the plane of the
rotating accessory and run the multitool at maximum no load
speed for one minute. Damaged accessories should break apart
during this test time.