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USING THE "MORSE TAPER" SYSTEM DRILL BITS
(PICS. 24 & 25)
The "Morse Taper" system
This drill can accommodate larger drill bits than the chuck
capacity. Industry uses the Morse taper system to fit drill bits.
The "Morse Taper" system is a method of securing an external
(male) taper securely into an internal (female) tapered drive
shaft. These tapers are referred to as self holding because they
stay in place when correctly seated. This system allows the
easy changing of chucks and drill bits. The internal and external
tapers are ground at an angle that allows the two tapers to
lock together. Various accessories including chucks, drill bits,
reamers and adaptor sleeves with various size of "Morse Taper"
shank can be obtained. A Morse taper accessory will comprise
the cutter (Pic. 24) (24.1), Morse taper shank (Pic. 24) (24.2)
and a tang (Pic. 24) (24.3). There are two short vertical ejector
slots machined in each side of the drive spindle and the drive
spindle housing (Pic. 25) (25.1). This allows the use of a "Drift"
to "Break" release the taper lock.
To remove the chuck or Morse taper drill bit, lower the drive
spindle and hold in position. Locate the ejector slot in the drive
spindle housing, rotating the drive spindle until the drive spindle
ejector slots align with ejector slots in the drive spindle housing
(Pic. 25) (25.1). Look at the side of the spindle and you will see
the ejector slots (Pic. 25). The chuck tang is visible through the
ejector slot. To break the taper, use the tapered drift. Insert the
drift into the ejector slot above the chuck or drill bit tang. Using
a soft faced hammer tap the drift until it breaks the taper fit. The
chuck and Morse taper sleeve will fall out of the motor spindle.
A wide variety of Morse taper drill bits are available complete
with adapter sleeves.
NO VOLTS EMERGENCY STOP SWITCH (PIC. 26)
This machine is fitted with a "No Volts Switch". In the event
of a mains power failure or if the mains plug is removed from
the mains supply socket before the machine is switched off.
The machine will not re-start without warning when the mains
supply is restored or the mains plug is re-connected to the
mains supply, until the machine is switched ON at the ON/OFF
switch fitted to the machine. The switch is also fitted with an
emergency stop cover. To start the machine, lift the emergency
stop cover (Pic. 26) (26.1) and press green the ON button (Pic.
26) (26.2). To stop the machine, press the red OFF button (Pic.
26) (26.3). In the event of an emergency, hit the emergency stop
cover (Pic. 26) (26.4), this will switch the machine OFF and will
mechanically lock the emergency stop cover in place preventing
the machine from being switched on until the mechanical lock
has been released. To release the mechanical lock depress the
emergency button and slide it upwards (Pic. 26) (26.5).
FEED DEPTH ADJUSTMENT (PIC. 27)
This facility is useful if a number of uniform depth holes are
required in a work piece. Set the work piece to be drilled in your
machine vice. Insert the drill required into the chuck. Bring the
drill bit into contact with the work surface. Loosen the clamp
knob (Pic. 27) (27.1) and rotate the scale ring (Pic. 27) (27.2) to
the zero position. Select the depth required and rotate the scale
ring to the required depth against the pointer. Re-tighten the
clamp knob. The drill will stop at the required depth every time.
MC350: Using the depth stop nuts (Pic. 27B) (27B.1) and the
depth scale (Pic. 27B) (27B.2), set the depth of hole required,
secure the depth stop nuts. The drill will stop at the required
depth every time.
CHANGING THE SPINDLE SPEED (PICS. 28 & 29)
AND CHART 1 (PAG. 15)
Unscrew the cross head screw securing the pulley guard. Lift
open the pulley guard to expose the pulley system. Determine
the spindle speed required. Identify the pulley arrangement that
gives the nearest spindle speed to that required by referring to
the drill speed chart. Slacken the two wing nuts located on each
side of the casting (Pic. 28) (28.1). To release the tension on
the drive belt, move the tension lever to the left (Pic. 28) (28.2).
This will cause the motor, situated at the rear of the machine, to
slide on two slide bars, releasing the tension on the drive belt. To
move the drive belt to the desired pulley arrangement. Push the
belt on the largest drive spindle pulley towards the next smallest
pulley and at the same time rotate the drive spindle, by hand
until the drive belt locates onto the next smallest pulley. Repeat
this procedure on the jockey pulley and the motor pulley until the
desired pulley arrangement has been achieved.
MC350: Slacken the belt tension locking knob (Pic. 28B) (28B.1).
This will allow the tension on the drive belt to be released. The
motor assembly is hinged to allow tensioning of the drive belt.
For pulley arrangements see Chart 1.
NOTE: Do not cross the belt to give intermediate speeds. This
will cause damage to the machine.
BELT TENSION
When the desired pulley arrangement has been achieved
tension the drive belt by moving the tension lever to the right.
To check that the correct tension has been achieved, press your
finger onto the centre of the drive belt (Pic. 29). The drive belt
should move approximately 13mm. Re-tighten the two wing
nuts to lock the motor onto the two slide bars.
MC350: When the desired pulley arrangement has been
achieved tension the drive belt by moving the hinged motor
in the direction of the arrow (Pic. 30) (30.1). To check that the
correct tension has been achieved, press your finger onto the
centre of the drive belt (Pic. 31), the drive belt should move
approximately 13mm (Pic. 31) (31.1). Re-tighten the belt tension
locking knob.
MAINTENANCE
The drill requires very little maintenance apart from keeping all
unpainted surfaces coated in light oil.
Keep the machine clear of swarf which should be disposed of in
a proper manner and not put into household refuse bins.
Always inspect and check the set up and adjustments before
using the machine
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