Product
CNB34-001A1 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.
MACHINE SPECIFICATION
size : 440 x 320 x 1370mm height over broach guard
weight : Variable Machine 96kg
Mounting:
Floor mounted using 4 x 10mm diameter anchor bolts is recommended to ensure machine stability. Anchor bolts are not supplied.
Electrical Supply:
CNB34 Variable Machine -
220-240 Vac, 1 phase
50/60 Hz, 1.0 KVA
PERFORMANCE
Broach cutting speed:
Variable Machine:
Infinitely variable 7.1 to 37.8mm/s
Production Rate:
Variable Machine:
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.
ACCESSORIES Broach Keep CNB20-004A2 “U”, for 10mm x 5.0/2.5 sub-size samples, with 2/5mm 'U' notch Clamp Block CNB20-009A3 & Clamp Pins CNB22-002A4, for round samples Multi-notch attachments :
A) 10mm square multi notch attachment CNB21-006A1
Machine Design and Method of Operation
Machine Design:
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.
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.