Bosch Power Tools 11245EVS manual Operating Instructions

BM 1619929472 2-05 2/17/05 11:52 PM Page 7

Operating Instructions

TRIGGER "ON-OFF" SWITCH	selected impact rate and rotating speed
To turn the tool “ON” squeeze the trigger	virtually constant between no-load and load
switch. To turn the tool “OFF”, release the	conditions.
trigger switch, which is spring loaded and will	INSTALLING ACCESSORIES
return to the “OFF” position automatically.
	Clean the insert shank end of the accessory
To increase switch life, do not turn switch on
	to remove any debris, then lightly grease with
and off while tool is under load.	a light oil or lubricant.

VARIABLE SPEED DIAL		Insert accessory into the tool holder through
Your tool is equipped with a variable speed		the dust shield, while twisting and pushing
dial. The impact rate (BPM) and rotating		inward until it locks automatically into place.
speed (RPM) can be varied according to the		Pull outward on the accessory to be certain it
type of work being performed by setting the		is locked into the tool holder (Fig. 2).
variable speed dial to the selected setting.		NOTE: The high efficiency available from the
The chart below will help you to determine		rotary hammers can only be obtained if sharp
which setting to use for your application.
		and undamaged accessories are used. The
However, a pre-test will determine the best
		"cost" to maintain sharp and undamaged
speed setting, as the chart is intended only
		accessories is more than offset by the "time
as a guide. Once the proper setting is
		saved" in operating the tool with sharp
determined the impact rate and rotating
		accessories.
speed is kept constant by means of the
		REMOVING ACCESSORIES
"Electronic Feedback Circuitry". The variable
speed dial can be adjusted while the motor is		! WARNING	Accessories may be hot after
running with the tool free from work, allowing			use. Avoid contact with skin
the operator to adjust the impact rate and		and use proper protective gloves or cloth to
rotating speed according to the actual		remove.
application.		To remove an accessory, pull and hold
CHIPPING (DEMOLITION)		locking sleeve backward and pull bit forward.
Area of application	Control setting	All accessories should be wiped clean after
		removing.
Plaster work	1 - 2		FIG. 2
Removing tiles	3
Brick work	4
Concrete	5 - 6
DRILLING HOLES
Lower speeds	Higher speeds
Accurate starts	Faster penetration
Minimize breakouts
when the bit exits
the material.
ELECTRONIC FEEDBACK CIRCUITRY
(EFC)		LOCKING SLEEVE
The internal electronic feedback system
provides a "soft start", which will reduce the
stresses that occur from a high torque start.
The system also helps to keep the pre-
		-7-