(1) HAMMER-ON-DOLLY
This is also known as dinging on the dolly. The dolly is held directly under the area being struck with the hammer. Hammering smoothes the dented metal between the dolly and hammer. This method causes the sheet metal to stretch.

Hammering on a dolly is most effective for repairing shallow dents.
(a) The hammer strikes the sheet metal, causing the dolly to bounce against the metal surface. Thus the damaged portion is worked out from both inside and outside.

(b) The sheet metal stretches between the hammer and dolly, and deformation is distributed around the strike area.

(c) Continuously move the dolly under the shifting deformation so that it can be struck properly.

(d) The sheet metal gradually stretches and returns to its original shape.

(2) HAMMER-OFF-DOLLY
This is also known as dinging off the dolly.
Place the dolly directly under a dent, and hammer against the edge of the dent. The hammer drives one area downward while the reaction of the dolly drives the adjacent area upward.

An example of the hammer-off-dolly operation is given below.
(a) Place the dolly under the deepest dent, and hammer the highest portion of the top surface.

(b) The raised portion of the surface lowers as it is struck with the hammer.

(c) Hammer blows are transmitted to the dolly, creating a reaction force.

(d) This reaction force pushes the dent.

(e) Repeat steps (a) - (d) until the surface is smooth.

Dollies
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