The ease of changing
speeds is one of the most desirable features of the Shopsmith MARK V.
By adjusting the motor speed between 700 and 5,20 rpm, you can perform
a multitude of operations, including sawing, molding, sanding, lathe turning,
drilling, shaping and more.
The Shopsmith speed
change mechanism relies on sliding sheaves that increase or decrease your
MARK V's speed by increasing or decreasing the diameters of driving or
driven pulleys. This unique pulley system allows an infinite variation
in speeds and enables you to select the exact sped for any given operation.
Such precision parts
require regular oiling to ensure the smoothest possible movement - a few
drops of lightweight machine oil applied every ten hours of actual running
time is recommended.
The speed control
mechanism is located inside the MARK V's headstock. Its accuracy depends
on regular maintenance. However, sometimes, it demands a little more.
Here's a handy, quick-reference trouble-shooting chart for those times.
change from high to low speeds
may be disconnected
from back side of headstock and press leaf spring in on the quadrant,
then re-hook the loop.
nameplate from the back side of the headstock. Reach in and try
to slide the control sheave. Oil the shaft and work the oil in.
stops turning when speed dial is turned from high to low
sheave is stuck
belt cover and oil motor shaft. Move sheave by hand. Belt may have
slipped between control and Poly-V sheaves.
dial creeps during operation
(504228) may not have sufficient tension
control handle. Remove the screw that holds the spring and gently
bend the flat spring to create added tension.
hard to turn speed dial when moving from high to low speed
Sticking sheaves. Keys on shafts may be bent.
Oil both control
(504781) and floating(504208) sheaves. If oiling doesn't help, file
of any burs or replace the bent key(s).
changes although dial remains at same setting when changing speeds
in back may be stripped. Remove control handle and check. If so, replace.
dial turns...but speed remains the same
on quadrant. May be stripped. Remove nameplate from back side of
headstock and check. If stripped, replace.
from back side of headstock and rehook loop onto quadrant.