Rotary Hammer Tests

Posted by on August 29, 2006

A few months ago, we broke out a few of our D-Handle Hammer Drills and put them to a test. The lineup included the Makita HR2455, Hitachi DH24PF3, Bosch 11224VSR, Bosch 11255VSR and the Dewalt D25203K. The test was pretty simple. We grabbed some 3/8” SDS bits and went to this big boulder we have in our back lot. I am not too sure what kind of rock it was, but it was pretty hard stuff. We drove the bits in four inches and timed the results.

We had one guy doing the drilling and one guy on the stop watch to try to keep it as consistent as possible. Each drill got its own fresh bit to start with, and we did five holes each to get an average time.

The Results (with current prices):
Hitachi’s DH24PF3 average time of 17.04 seconds ($185)
Makita’s HR2455 average time of 19.86 seconds ($200)
Bosch 11255VSR average time of 22.08 seconds ($280)
Dewalt D25203K average time of 22.98 seconds ($200)
Bosch 11244VSR average time of 23.74 seconds

Granted its not the most scientific way of doing things, but it does give you an idea how these guys perform. I did think its worth mentioning that while the Hitachi was the fastest, it also had the most vibration of the group.

Article submitted by Chris of KMS Tools.

One Response to Rotary Hammer Tests

  1. Anonymous

    If you wanted to be more ‘scientific’ about it, you could test them using two different approaches.

    1. Test them all with every different size of drill bit available. Each machine is going to have a slightly different rotational speed, blow energy and number of blows per minute and will work most efficiencly for a particular sized bit. Which is the one in the comparison graph that they give you to convince you that their machine is so much better than their cometitors.

    2. More pragmatically, look at which drill bits you shift the most of in your shop. Those are the ones your customers actually use. Here in the UK it’s mainly 5.5mm, 6mm and 8mm. You’ve guessed it, those are the sizes of the plastic wallplugs etc that we sell the most of. Comparison test the machines with those sizes in the various hardnesses of brick and concrete and you will have some information that will be really useful to your customers. You may also find that the candle that burns twice as bright burns half as long, in terms of machine life. Or, it might not and that would be a really useful bit of information too.

    Paul from London