Sherline 5000 Mill General Manual

belt is routed properly. Then secure the cover with (2) 1-3/8" pan head screws
which go into nuts pressed into the back of the inner belt guard.
5. Attach motor mounting bracket to rear of headstock with two 10-32 x 3/8" socket
head screws. There is enough "play" in the mounting holes to allow you to ensure
the motor is visually mounted parallel with the spindle axis. (Note: If chip guard
is to be mounted, its attachment screw replaces one of these mounting screws. It
can be mounted at this time or after the headstock is in place. See instructions that
come with the chip guard.)
6. Place drive belt over spindle pulley and insert 10-32 x 3/4" socket head screws
(with 2 washers on each) through motor mount slot and into holes in the ends of
the motor standoffs. (These standoff ends should be exposed through locating
holes in the outer belt guard.) NOTE: The normal operating position for the drive
belt is on the large diameter groove on the motor pulley and the small diameter
groove on the spindle pulley. Use of the other (low RPM) position is discussed
elsewhere in these instructions. (See Figure 11.)
7. Tighten motor mount screws, tilt speed control unit out of the way and check the
alignment of the drive belt. It should be perpendicular to the drive pulleys. If it is
not, loosen the set screw on the motor pulley and adjust it in or out on its shaft
until the drive belt is square with the motor.
8. Pull desired tension into drive belt by sliding the motor unit out in the bracket
slot. Tighten mounting screws to hold the motor/speed control unit in place.
NOTE: Do not overtension the drive belt. Just make sure it has enough tension to
drive the spindle pulley without slipping under normal load. By not
overtightening the belt you will not only extend its life, but will also provide a
margin of safety for belt slippage should a tool jam in a part or an accident occur.
The belt must be a little tighter when used in the low speed range because small
diameter pulleys are not as efficient.
9. Set mounting plate into top of belt guard housing so it rests on rails molded onto
inside surfaces of housing. (The pressed-in nut goes down and to the outside.)
Slide the plate toward the outside (toward the spindle pulley) until it stops.
NOTE: The mounting plate was designed to be easily removable so it is out of the
way when changing the drive belt position.
10. Rotate speed control unit into place and insert the single 10-32 x 1/2"* socket
head screw through hole in speed control housing and into nut in mounting plate.
Tighten enough to hold in place. Do not overtighten.
*Changed from 3/8" long screws 1/5/05 for stronger engagement.
NOTE: Those of you who machine a lot of wood or brass may want to purchase and
install a switch cover (P/N 3015) to keep the fine dust out of the power switch. The wood
dust can gum up the switch causing intermittent operation. Brass dust can short out the
switch or cause a risk of electric shock to the operator.