Dell DCH172, Instruction Manual

33

ENglIsh

use high‑speed steel twist drill bits or hole saws. Use a 
cutting lubricant when drilling metals. The exceptions 
are cast iron and brass which should be drilled dry. For 
MASONRY, such as brick, cement, cinder block, etc., use 
carbide‑tipped bits rated for percussion drilling.

3.  Always apply pressure in a straight line with the bit. Use 

enough pressure to keep drill biting, but do not push 
hard enough to stall the motor or deflect the bit.

4.  Hold tool firmly with both hands to control the twisting 

action of the drill. If model is not equipped with side 
handle, grip drill with one hand on the handle and one 
hand on the battery pack.

WARNING:

 Drill may stall if overloaded causing a 

sudden twist. Always expect the stall. Grip the drill 
firmly to control the twisting action and avoid injury.

5.  IF DRILL STALLS, it is usually because it is being 

overloaded or improperly used. RELEASE TRIGGER 
IMMEDIATELY, remove drill bit from work, and determine 
cause of stalling. DO NOT depress TRIGGER ON AND OFF 
IN AN ATTEMPT TO START A STALLED DRILL — THIS CAN 
DAMAGE THE DRILL.

6.  To minimize stalling or breaking through the material, 

reduce pressure on drill and ease the bit through the last 
fractional part of the hole.

7.  Keep the motor running when pulling the bit back out of 

a drilled hole. This will help prevent jamming.

8.  With variable speed drills there is no need to center 

punch the point to be drilled. Use a slow speed to start 
the hole and accelerate by squeezing the trigger harder 
when the hole is deep enough to drill without the bit 
skipping out.

Drilling in Metal

An SDS plus

®

 to round shank adaptor chuck is required. 

Ensure that tool is in drill‑only mode. Start drilling with slow 
speed and increase to full power while applying firm pressure 
on the tool. A smooth even flow of metal chips indicates 
the proper drilling rate. Use a cutting lubricant when drilling 
metals. The exceptions are cast iron and brass which should 
be drilled dry.

NoTE: 

Large (5/16" to 1/2" [7.9 mm to 12.7 mm]) holes in 

steel can be made easier if a pilot hole (5/32" to 3/16" [4 mm 
to 4.8 mm]) is drilled first.

Drilling in Wood

An SDS plus

®

 to round shank adaptor chuck is required. 

Ensure that tool is in drill‑only mode. Start drilling with slow 
speed and increase to full power while applying firm pressure 
on the tool. Holes in wood can be made with the same twist 
drills used for metal. These bits may overheat unless pulled 
out frequently to clear chips from the flutes. For larger holes, 
use spade bits, power auger bits, or hole saws. Work that is 
apt to splinter should be backed up with a block of wood.

Drilling in Masonry

When drilling in masonry, use carbide‑tipped bits rated for 
percussion drilling and be certain that the bits are sharp. Use 
a constant and firm force on the tool to drill most effectively. 
A smooth, even flow of dust indicates the proper drilling rate.

Drilling (Fig. I)

WARNING: 

To reduce the risk of personal injury, 

ALWAYS

 operate the tool with the side handle properly 

installed. Failure to do so may result in the side handle 
slipping during tool operation and subsequent loss of 
control. Hold tool with both hands to maximize control.

NOTICE: 

If drilling thin material, use a wood “back‑up” 

block to prevent damage to the material.

1.  Turn the mode selector 

 5 

 to the drill symbol 

 16 

.

2.  Use sharp drill bits only. For Wood, use twist bits, 

spade bits, power auger bits or hole saws. For Metal, 

SDS plus® Chuck (Fig. J)

WARNING:

 Burn Hazard. 

ALWAYS

 wear gloves when 

changing bits. Accessible metal parts on the tool and 
bits may get extremely hot during operation. Small bits 
of broken material may damage bare hands.

To insert bit, insert shank of bit about 3/4" (19 mm) into 
chuck 

 14 

. Push and rotate bit until it locks in place. The bit 

will be securely held.
To release bit, pull the sleeve 

 15 

 back and remove the bit.

Shocks – Active Vibration Control (Fig. A)

For best vibration control, hold the tool with one hand on the 
main handle 

 6 

 and the other hand on the side handle 

 1 

. 

Apply just enough pressure so the SHOCKS 

 10 

 in the rear 

handle are halfway depressed. The hammer only needs 
enough pressure to engage the internal active vibration 
control. Applying too much pressure will not make the tool 
drill faster and active vibration control will not engage.

Electronic Overload Protection

If the drill bit becomes jammed, the power to the drill 
spindle will be interrupted by the activation of the electronic 
overload protection. To reactivate the power to the drive 
spindle, the tool's trigger should be released and then 
depressed. Due to the resulting forces, always hold the tool 
with both hands and take a firm stance.

Mode Selector (Fig. I)

CAUTION:

 Do not change to drill or hammerdrill 

mode with a chisel bit in the chuck. Personal injury and 
damage to tool may result.

CAUTION:

 Never change the mode while the unit 

is running.

For drilling (non‑percussion) push the mode selector lever 

 5 

in the up position until the line aligns with the drill bit 
symbol 

 16 

. For rotary hammer drilling (with percussion) 

push the mode selector lever in the down position until the 
line aligns to the drill bit and hammer symbol 

 17 

.

NoTE: 

The mode selector lever must be in drill or hammer 

mode at all times. There are no operable positions 
in between.

and will automatically turn off 20 seconds after the trigger 
switch is released. If the trigger switch remains depressed, 
the worklight will remain on.

NoTE: 

The worklight is for lighting the immediate work 

surface and is not intended to be used as a flashlight.