Combi-Hammers

Host David Thiel explains how Combi-hammers are used for drilling and chiseling in concrete.
combi hammers used for drilling in concrete

combi hammers used for drilling in concrete

Figure A

A Combi-hammer is used for hammering, chipping and drilling holes in concrete. It has different modes of operation for rotation (just drilling), rotation with hammering, and chiseling.

Some of the chiseling tools used with the Combi-hammer include the two flat chisels and a polygon-design chisel. The polygon-design is self-sharpening. The internal portion of the fluting is a made of harder steel than the external portion.

Softer steel wears away more quickly, exposing new material and maintaining a sharp bit as the tool is used. A helical bit is a double fluted bit for pulling dust out of the way when drilling a hole. Also, this helical bit has a full-carbide tip to make drilling quick and easy.

he cruciform bit has an 'X' shaped bit. It's used for drilling large holes. It also has fluting for cleaning dust out of the hole.
A dry core bit leaves material in the hole that's been chipped out.

The Combi-hammer can be used with a keyless chuck or a Jacobs chuck for using wood and metal bits in the rotation mode. This tool also has a reducer for use with smaller bits. To change a bit, first unplug the tool for safety. Then, push the locking collar down to release it and pull the old bit out. With the locking collar still down, put the new bit in and rotate it until it locks down. Let go of the collar to re-engage it.

Tips to Remember:

When using the Combi-hammer for drilling, remember that the less pressure applied, the faster the tool will drill. A guide is used to adjust the depth of the hole.

When chiseling, hold the tool at a 70-degree angle from the concrete. Begin working four inches from the edge of the concrete, then move inward.

This tool can be used for breaking up concrete driveways and patios, as well as for drilling holes for anchors.

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