While in most cases the results of using a variable-speed controller
with a portable power tool will be good, occasionally, due to the
peculiarities of some motors, the motor speed may fluctuate instead of
remaining stable. But you can rest assured that in either case, no harm
will be done to the motor or the tool.
—EDWARDCOWERN,Wallingford, Conn.,
from a question by David Carlson, Richland,Wash.
Reversing Belt-Driven Tools
I
T’S EASY TO REVERSE DISCsanders and other belt-driven tools if the
motor is mounted perpendicular to the shaft it drives, so there’s a
quarter-turn in the belt, as shown. To reverse, simply loosen the belt,
flip 180 ̊ (on either pulley), and tighten. An added advantage is that the
twist in the belt seems to dampen vibrations.
—ROGERLYNNE,Bloomington, Minn.
SHOP SETUPLoosen motor,
and flip belt to reverse.Tool pulley