Motorized Charpy Notch Machine is a self-contained floor mounted unit, specially designed for cutting Charpy and Izod 'V' and 'U' notches in the pre-machined standard 10mm square, sub-size and 0.45" diameter specimens.
Notches can be cut in carbon steels, easily machined low alloy steels, non-ferrous and plastic materials.
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.
The 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.
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.
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.
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.
A hand-operated clamp is mounted on the machine top plate at comfortable working height and ensures that the specimen is held accurately and securely in position. It is fitted with adjusting screws and an end stops to ensure correct specimen positioning. A micro-adjustor provides manual adjustment for broach depth of cut and hence the final notch depth. Once set, the adjusting screws provide repeatability for the next specimen.
The clamp can accommodate 10mm square & 10mm x 7.5/6.7mm rectangular sub-size samples. For 10mm x 5.0/2.5mm rectangular sub-size samples, a broach keep “W” is required and for circular specimens, a different clamp block is required.
The broach can easily be removed for re-sharpening or replaced to cut a different type of notch.
440 x 320 x 1020mm
height to clamp handle
440 x 320 x 1370mm
height over broach guard
Fixed Machine 95 Kg
Variable Machine 96kg
Floor mounted using 4 x 10mm diameter anchor bolts is recommended to ensure machine stability. Anchor bolts are not supplied.
220-240 Vac, 1 phase
50/60 Hz, 0.5 KVA
For the fixed speed machine only, customer to advise their electrical Hz frequency for the setting of the broach travel limit switches at our works.
220-240 Vac, 1 phase
50/60 Hz, 1.0 KVA
Broach cutting speed:
27mm/s (50Hz) 32mm/s (60Hz)
Infinitely variable 7.1 to 37.8mm/s
The time for the broach travel in each direction is 10 seconds. So allowing for loading/unloading & cleaning of the broach teeth an operational floor-to-floor time of 40 seconds can be achieved.
The time for the broach travel in the cut direction is between 7 & 37 seconds and the return time is 10 seconds. So allowing for loading/unloading & cleaning of the broach teeth an operational floor-to-floor time of 40 to 60 seconds can be achieved, which is dependant upon the sample material & speed the broach is set to cut.