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

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.

Next Up

Key Features You Want in a Drill and Essential Drill Bits

Drills, driving bits and drill bits are probably the most frequently used tools by homeowners and DIYers. Take a few minutes to learn the different types and what you really need.

Pipe Finder

This useful tool can detect metal pipes behind your walls the way a stud finder detects wall studs.

Circular Saw Basics

From household to heavy-duty models, there are several types of circular saws available to help get the job done.

Sandpaper Basics

Power sanders are great for smoothing large surfaces, but for sanding tough areas, a sheet of sandpaper is best. Here's a guide on how to choose the best sandpaper for any project.

Concrete Nail Gun

This concrete nail gun is a tough fastening tool that drives nails all the way through concrete.

9 Tips for Buying Used Woodworking Tools

Getting second-hand tools is a great way to get good tools and save some dough.

Trim Routers

See why the trim router has become a workshop staple.

Plunge Router

DIY experts explain the uses of a plunge router.

Air-Nailer Basics

For those tired of swinging a hammer, a pneumatic air nailer may be the answer. Here are a few air nailers that make driving nails faster and more effective.

Rotary-Tool Basics

Rotary tools accept a variety of attachments, which enable the handheld tool to be used for sanding, polishing, carving and more. Find out which attachment you need to help get the job done.

Get Social With Us

We love to DIY. You love to DIY. Let's get together.

Consult Our A-Z Guide

Everything You Need to Know

Browse a full list of topics found on the site, from accessories to mudrooms to wreaths.  

How-To Advice and Videos

Get video instructions about kitchens, bathrooms, remodeling, flooring, painting and more.

Watch DIY Downloads Now

Watch DIY Network LIVE

Don't miss your favorite shows in real time online.