Jet Engine at ft

140dB

If you're planning to buy a new tool, one of the simplest things you can rlo to reduce your shop's noise level is to select a quiet tool. 'I"his may sound like a simple task, but it might require a bit of detective work.

While some manufacturers include decibel readings along with other information about the tool, that seems to be the exception — not the rule.

He sure to ask the salesperson about noise while you're examining the tool, in case the information isn't posted where it's easily accessible.

noisetest. So what i do is fire up the tool in the store. After all. if it's loo loud in a wide open space (like a tool or home improvement warehouse), you know it's going to be too loud at home.

Don't give a tool the benefit of lite doubt when il comes to noise. 'Hint sound will actually feel a lot louder when you brinu the tool into your home workshop. so be realistic.

Note: Unfortunately, this "lest it in the store" method isn't exactly fool proof. Untd you can actually run a scrap piece of wood through the blade of the tool, you won't know exactly how-loud it will get in use.

features. Another thing dial's worth considering before buying a tool is the features it has thai can contribute to quieter operation. Some of Them are designed specifically with noise reduction in mind, while others have unrelated uses (a lower level of noise is just a pleasant bonus).

'["here are several features to consider, but some important ones to be aware of are the motor, drive system, and the speed ol operation (see below).

Universal Motor. Recausc it operates a I high speed, a tool with a universal motor runs louder.

Induction Motor. A f\eavy motor housing and slower speed contribute to d quieter funning tool.

One thine dial affects die noise produced by a tool is the type of motor. Because it runs at a higher speed, a universal (brush-lype) motor is louder than an induction (brushless) motor.

Note: To tell them apart, simply check for the "caps" that hold the brushes in place.

Although most lutnd-held power tools ktse a universal motor, you'll often have 3 choice when buying a stationary power tool (see photos at right).

Universal Motor. Recausc it operates a I high speed, a tool with a universal motor runs louder.

Induction Motor. A f\eavy motor housing and slower speed contribute to d quieter funning tool.

Gear-Driven. A tool that Transfer'; pow through a system of gears lends Co run louder.

The drive system of a lool also makes a difference in the noise it generates. As a rule of thumb, a gear driven tool runs louder than one that's belt-driven (see photos at right).

The reason is simple. In a gear-driven tool, there's a certain amount of ""transmission" noise caused by the gears meshing together.

But if you transfer power from the motor to the blade Through a belr, it eliminates diis noise.

Gear-Driven. A tool that Transfer'; pow through a system of gears lends Co run louder.

Belt-Driven. A belt-driven tool offers o quieter rr>elfxxi of getting pertver from the motor to the h'.^rif

Although it's not designed specifically to reduce noise, a tool with a variable speed conirol can lx- set to run slower (and therefore significantly quieter) than a single speed tool.

l-'or example, the decibel reading of ilie variable speed router in the left photo drops from 100 dB at high speed to 7S dB at the slowest speed.

If you already have a fixed speed router, you can use a control like the one in die far right photo.

Variable Speed. A. rou:er vv,:n a b-j:!t-;n variable speed control can be se: to run slower and quieter.

To reduce the RPM (and noise) of a fixed speed router, use a speed control unit.

Otic ol* the nurin sources of tool noise is the vibration that's set up by tho tool's own motor. Reducing this vibration will go a long way toward a quieter tool and a quieter workshop.

The best way to damp the excessive vibration (and noise) is to absorb the vibration before it's transferred to other parts of the tool or stand.

ANTI-VIBRATION PADS. One way to do this is to insulate the base of the tool from the stand. To rlo this, mm Trorp

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