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I bought a Dewalt DCF900 impact driver. I've read their 2 sentence description of precision wrench mode, and still am not sure how to use it. Other than offering "greater control"...I'm not sure if it's safe to use this mode when fastening a nut.

What is the max torque when tightening in this mode? In an automotive setting, where can I safely use this mode? How does it prevent stripping the bolt when tightening? (I assume that's what the "precision" refers to).

(I asked Dewalt on their support/chat and got nothing but the same sentences cut and paste from their promotional material)

TSG
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1 Answers1

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The precision torque setting operates at max torque, which is 1030 ft-lb or 1396nm. About a minute into this video the feature is explained.

When tightening, precision wrench will spin at a lower than maximum RPM until it senses the movement stops, then pauses for just under a second before it starts impacting. The idea is that you can use it to drive nuts and bolts without impacting as the pause gives you time to let off the trigger. If you keep your finger on the trigger it will then impact at the maximum torque setting.

When loosening, precision wrench will go at full torque until is senses it break free, then it will slow the spin speed.

There's a decent summary of the features on this page.

GdD
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