What chisels to buy initially for a pneumatic tool

["Simon Brown" <moonsong@zzzzzzzzzzzzzzz>]

Tom,

Standing comfortably and holding the machine loosely helps with control. Let
the weight of the machine do the work of pressing the blade through the
stone.

I try to imagine the finished surface beneath the bossage, and try to
imagine the blade periphery passing within a set distance from the required
surface. When I use an angle grinder in this way, I keep my elbows locked
(in a fairly comfortable position) and use my shoulders, knees, hips and
feet to move around- this avoids 'arcing' into the face. I also make the
grinder blade exit the cut at the leading edge of the cut so the blade
doesn't grab the stone and run out of control. That is, I adjust the guard
and the handle so the dust exits straight away, instead of being dragged
into the cut and heating the blade too much.

Another trick is to watch the rings that form on the blade as it is scored
by the stone. They can provide a depth gauge- or you can run a felt-tip
marker on the blade as it is spinning (slowly) to make a set depth
reference. Sink the blade into the stone and keep your eye on the depth mark
as it cuts.

Regards,
Simon