Unibor UA5000 Autofeed - Manual (Page 3)

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If you are unfamiliar with the use of annular
(or broaching) cutters, read this guide - you will
benefit from the better performance and longer
life of the tool if you understand the concept.
Annular cutters only cut material at the
periphery of the hole leaving a solid ‘slug’ at
the centre which is ejected at the end of the cut,
rather than converting the entire hole to shavings.
As a result, the time and energy required to make
the hole is lower than for a traditional twist
drill.
The broaching capacity of a machine is
therefore greater than the twist drill capacity.
The slug ejected after the cut also has a higher
scrap value than shavings.
The benefits in terms of productivity can be
as much as double.
Power
required
Material
removed
Cutting T
ime
Cutting T
ime
E
LECTRONIC
C
ONTROLS
L OAD D ETECTOR
If there is an overload during drilling, the
following functions are automatically activated.
The load detector may not function properly if
the power supply is an engine generator or the
supply voltage is too high or too low.
A UTOMATIC F EED C ONTROL F UNCTION
This system automatically controls the feed
rate where several seconds after start-up of the
drilling it automatically slows down the feed
and then the rate varies depending on the load
on the motor. The feed rate is also automatically
regulated according to the cutter diameter.
O VERLOAD S TOP F UNCTION
Both the drilling and feeding operations stop
automatically whenever there is an excessive
load on the motor, preventing the motor and
cutter from breaking. If the cutter is dull, however,
breakage may be inevitable.
C YCLE S TOP F UNCTION
After the cut has finished, a detector responds to
the reduction in load and both the drill and the
feed motor automatically stop.
M ACHINE P ARTS
Capstan
Speed
change
switch
L IMIT S WITCH F UNCTION
Even if the automatic stop function fails at the end
of drilling, allowing the drill motor to continue
downward feed, the limit switch stops both the
drilling and feed when the stroke reaches its
lower limit.
S IDE S LIP D ETECTION F UNCTION
If the magnet slides off while drilling, the drill
motor and the feed will stop.
R ESTART P REVENTION F UNCTION
• When a power failure occurrs while the tool
is being used, the restart prevention function
operates when the power is restored.
• Even when the drill stops during operation
because of the interruption or accidental
unplugging of the power supply, and the power
supply then resumes, the indicator lamps are lit
and the magnet regains its attracting power, but
the drill motor will not rotate.
• To resume work, set the magnet switch to On
and then the motor switch to On, and the drill
motor will start.
B ROACH C UTTING
Cradle slide
Cradle slide
adjustment screws
Cutter capacity - 12 - 50mm (HSS)
No load speeds - 350/650 rpm
Power consumption - 1150w
Clamping force - 720kg
Size (L/W/H) - 330 x 268 x 565mm
Weight
- 21 kg
Voltage - 240v
A LSO I NCLUDES : Warranty, Carrying case,
Allen keys, Safety strap, Cutting Oil
• The easy to use and rugged design makes the
UA5000 a cost effective solution to drilling
clean, accurately positioned holes.
• Powered by a variable speed Eibenstock UNI
II motor.
• Automatic load sensing cutter feed.
M AIN FUNCTIONS
1. Slow start
The feed motor rotates slowly before cutting
starts for cutter protection and ease of
centring.
2. Auto feed speed adjustment
The feeding speed is automatically adjusted
depending on the size of cutter used.
3. Auto-return
The drill motor rises quickly when cutting is
completed and stops at its original retracted
position.
4. Auto-stop
The drill motor stops to avoid breakage of the
cutter when the force required to cut reaches a
predetermined amount. The drill motor will stop
if the magnet base moves during cutting.
5. Non-accidental-start
The machine must be reset if the power supply
is lost during operation. The switch must be
manually set to off and then back to on to reset.
T
ECHNICAL
O
VERVIEW