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Hammer Drills Reverse setting

AK_Retired's picture

Hammer Drills Reverse setting (post #213131)

I’m overhauling an old RV and can’t remove some rusted screws with my drill driver.  Will a hammer drill driver have the extra torque in reverse mode to break loose these rusted screws?


Impact driver should do it. (post #213131, reply #1 of 6)

Impact driver should do it.

AK (post #213131, reply #2 of 6)

Zep has a killer penetrating nut buster, better I think than most.  Soak the hell out of the screws!

take a matching screw driver if not nuts and put it in place on the screw.....firmly tap on the end of the screwdriver with a hammer several times to break the bind (bond) of the rust around the threads.

then an impact driver might have a chance.  Use low setting first and push hard.  The screws might snap with the force, so I usually pop it a few times, reverse, fwd and then a couple more pops.


Then there's always an easyout.



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A hand impact driver is often (post #213131, reply #3 of 6)

A hand impact driver is often a useful tool for breaking free recalcitant screws.

Of all the preposterous assumptions of humanity over humanity, nothing exceeds most of the criticisms made on the habits of the poor by the well-housed, well-warmed, and well-fed.  --Herman Melville

Those are great tools, but (post #213131, reply #6 of 6)

Those are great tools, but why do they always come with the Mega Size bits?  Really, I don't get it. I usually use a 3/8 to 1/4 inch adapter with a 1/4 inch socket and a quarter inch drive bit of some type that falls out everytime I turn around.  Still gets the job done once in a while.  Usually the head fails, sometimes the bit fails, and probably most of the time the screw loosens.

It Won't Work (post #213131, reply #4 of 6)

Hammer-drills hammer the bit forward as it spins. There is no help to turning the bit. As such, they don't hammer at all in 'reverse.'

You are thinking of an impact driver, which hammers the bit in the direction it rotates. Those apply equal impact in either direction.

Uh, no.  Hammer drills (post #213131, reply #5 of 6)

Uh, no.  Hammer drills hammer the bit down in forward and reverse.  This can help remove screws due to the hammer action, but an impact driver works much better.