In Part 1 of this discussion on air chisels we touched on operating hazards, general operating techniques, and a homemade chisel prop. Several videos of training on the prop along with the entire post can be seen here. Again, air chisels seem to be a love them or hat them type of tool, but in many scenarios they can provide a quick means to rescue entrapped victims. In this post we added some more training tips, street-smart techniques, and pictures of possible uses. The list isn’t all inclusive, but at least a start for your training.
Phil Burden and I have been trading emails on using chisels here lately and he brought up several great teaching points. Not only do we need to know how to set up the tool for operations, we also need to understand the tips, angles, and handling.
In Post 1, several types of chisel tips and working pressures where listed. For this post we added a little more description to the photos on where you may use them. Add other possibilities in the comments section below.
It is important to practice using the different chisel tips to fully understand the capabilities.
Again, it takes a great deal of practice to get a feel for the proper angle to hold the chisel. For example, if you are using a double blades panel cutter and plunge into a sheet metal panel on a car, chances are good that you may get the tip stuck. The tips are not meant to be used as a prying tool and can fail when used in such a manner.
The picture to the left shows a firefighter using the chisel at a low angle in relation to the material being cut. This prevents plunging the tip head into the material and potentially becoming stuck.
The chisel operator must constantly change the angle of the chisel to stay flush with the material being cut.
In the picture to the left, you can see all the different angles that the chisel will have to move in to complete the cut of the frame above the strut tower for a dash lift. More on using the chisel to speed up the dash lift later in this post.
Think about how most chisels come out of the storage box…sideways, right? Just because the chisel looks like a gun, you don’t have to hold it like a police officer. You are allowed to hold the chisel sideways and upside down as well. Whatever position puts you into the best position to have a good angle for the chisel tip you picked to use for the job.
A Few More Scenarios
Good chisel ops takes practice. Keep the heel of your chisel low, tip angled low, and one hand on the trigger and the other on the chisel tip. Seek out your local body shops for scrap car doors or junk yards for vehicles and go to work.
Pass it on!