Published at Saturday, 25 August 2018. Impact Driver. By Tamra Mullins.
If you need to hog out some huge holes with that spade bit, and you are not close to an outlet for your regular drill, use an impact driver to blast through without killing your battery. Since the power isn't provided just by the motor, even difficult jobs won't kill a battery as quick as a regular drill.
The most important thing to consider when it comes to choosing a powerful impact driver is its torque. To put it simply, torque is the strength and power of your power tool. Torque is measured in pounds-per-inch or in.-lbs. This is the pressure (in pounds) that your impact motor puts out per inch. So, if you're looking for a powerful impact, look for one with the highest in.-lbs. of torque. There are quite a few construction tool manufacturers that make them with high torque, including brands like Bosch, Ridgid, Makita, and DeWalt. I would consider any impact drill with 1400 or more in.-lbs. of torque as heavy duty.
Several manufacturers like Makita Tools have included two or more speed ranges in their impact drivers. Sometimes, too much power is not always a good thing. You can destroy small screw heads and break screw shafts. The more power used, the less battery life. Just because you have a 400 HP motor under the hood of your car does not mean that you drive around town with the accelerator pedal to the floor.
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