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Blacks motorized broaching machine is a
self-contained floor mounted unit, specially designed for
cutting Charpy and Izod 'V' and 'U' notches in pre-machined
standard 10mm square, sub-size and 0.45" diameter specimens.
This machine is simple to operate and of robust
construction, with large removable panels to provide access
for routine maintenance. The design of the machine provides
a comfortable working height.
The cutting operation is achieved by
drawing a specially designed multi-toothed broach across the
specimen. The broach is drawn into the machine by precision
twin lead screws via a geared mechanism to ensure the broach
cuts perpendicular to the specimen clamp, limit switches are
fitted for end of stroke travel.
The lead screws are matched with the
travel nut to ensure minimum-operating clearances, while
spring loaded safety guards ensure swarf and debris cannot
enter into the lead screws and nuts.
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CNB31 FIXED SPEED MOTORISED CHARPY
NOTCH MACHINE
Notches can be cut in carbon steels, easily machined low alloy
steels, non-ferrous and plastic materials.
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Fixed Speed Drive:
Once the notch depth has been set and the
specimen clamped in position, the machine operation is
activated via lower and raise push- buttons. An additional
stop button is fitted for emergency use.
The machine operation is controlled by the
lower and raise push- buttons, which forward and reverse the
machine motor, resulting in the broach cutting and return
strokes being at a fixed speed. The motor has thermal
overload protection to protect the drive mechanism.
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CNB33 VARIABLE SPEED MOTORISED CHARPY NOTCH
MACHINE
The variable speed control allows adjustment of the broach cutting
speed, so more difficult materials can be broached and to give
extended broach life between sharpening.
Notches can be cut in carbon steels, more difficult to machine alloy
steels, stainless steels, non-ferrous and plastic materials. The
variable speed drive and our hard cut broaches allow a wider range
of materials to be cut, including stainless steel or more difficult
to machine alloy steels.
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Variable Speed Drive:
Once the notch depth has been set and the
specimen clamped in position, the machine operation is
activated via a lower and raise switch. A graduated knob
controls the speed the broach cuts and the broach return
speed is factory set at a constant fast speed. A stop
button is fitted for emergency use.
The motor is controlled via a variable
speed, frequency converter thyristor drive and the
pre-programmed P.L.C. ensures motor overload does not occur
to protect the drive mechanism.
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Examples of Notches
'V' Notch Specimen
'U' Notch Specimen
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Guards:
The machine guards totally enclose the drive motor and
operating mechanism.
A broach guard is fitted to comply with safety regulations;
limit switches prevent motor operation when the guards are
open.
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The sample is secured in the machine by the clamp. A light coating
of cutting oil (RTD recommended) is applied to the broach and the
lower push-button/switch is operated which draws the broach through
the specimen to produce an accurate notch profile. After the notch
has been cut, the sample is removed, the broach raise
push-button/switch operated, which raises the broach and the broach
teeth
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