Bosch Power Tools DH712VC manual Tool Tips, Selector Dial VARIO-LOCK, Hammer Mechanism

BM 160992A032 10-13_DH712 10/9/13 9:13 AM Page 9

VARIAbLE SPEED DIAL FIG. 6

Your tool is equipped with a variable speed dial. The speed and impact force can be adjusted by rotating the dial. Higher speeds and impact force work best for faster penetration when chiseling in hard masonry/concrete material. Slower speeds work best for chiseling material such as plaster or tile (Fig. 6).

SELECTOR DIAL

The selector dial allows the tool to be set for demo hammer or vario-lock operations (Fig. 7).

SELECTOR DIAL - “VARIO-LOCK”

The vario-lock can be set in any one of sixteen positions (22.5˚ increments). Choose a position which is best suited for your operation. The Vario-Lock position is intended for use with chipping bits such as bull points, spades, gouges, etc.

Turn the selector dial, to the “vario-lock” setting. Next, rotate the locking sleeve, along with the accessory, to the desired

position. Then turn the selector dial to the FIG. 7 “chisel” setting and slightly turn the locking

sleeve to have it automatically lock into a definite position.

CONSTANT RESPONSE CIRCUITRy 2

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- selected impact rate virtually constant between no-load and load conditions.

VIbRATION DAMPER HANDLE /

HAMMER MECHANISM

The integrated vibration damper in the main handle and hammer mechanism reduces vibrations (Fig. 6).

Tool Tips

VIBRATION DAMPER HANDLE / HAMMER MECHANISM

SERVICE

REMINDER

LIGHT

VARIABLE

SPEED DIAL

1

For the best penetration rates in concrete, run the tool with a steady pressure, but do not use excessive force as this will decrease the efficiency of the tool.

All hammers require a short period of time to warm up. Depending on the room temperature, this time may vary from approximately 15 seconds (90˚F) to 2 minutes (32˚F). A new hammer requires a break-in period before full performance is realized. This period may require up to 5 hours of operation.

An electric hammer is likely to be the most expensive portable tool at the construction job. The long wear and efficient operation of the BOSCH hammers will more than justify the cost for tools of this type. As earlier pointed out, sharp accessories as well as clean air vents are necessary for efficient operation. Establish and follow a set maintenance program.

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