Product
BLACKS CNM - Charpy/Izod
Specimen Preparation Machines
The Blacks CNM range of machines have been specially designed to allow laboratories and test houses to produce their own standard and sub-size Charpy / Izod test pieces ready for cutting the appropriate notch. Two variations of the Charpy Specimen Milling Machine (CNM) are available to cover a wide range of materials.
CNM-158A1 FIXED SPEED
CHARPY SPECIMEN MILLING MACHINE
The Fixed Speed Machine is recommended for customers who are producing specimens in carbon steels, easily machined low alloy steels, non-ferrous and plastic materials.
This machine has a fixed cutter speed of 1.98 m/sec(50Hz), 2.38m/sec(60Hz) and a variable feed rate for the samples of 2.5-9.0 mm/sec.
For customers producing specimens in a wider range of materials, see the CNM 140A1 with variable cutter speed.
CNM-140A1: VARIABLE SPEED
CHARPY SPECIMEN MILLING MACHINE
The Variable Speed Machine is recommended for customers who are producing specimens in carbon steels, more difficult to machine alloy steels, stainless steels, non-ferrous and plastic materials.
Please contact RJW Ltd if cutting superalloys.
This machine has a variable cutter speed of
1.0-2.5 m/sec and a variable feed rate for the samples of 2.2-9.0 mm/sec.
The varying of the cutter speed for differing materials improves the cutter tip life.
Machine Design and Method of Operation
Machine Design:
The machines are of robust design and construction, enabling them to produce
specimens to the surface finish and tolerances required by International Standards.
Both machines are designed for mounting onto a customer’s bench and are fitted
with an easily removable swarf (cuttings) tray.
The cutting process is carried out without cutting fluids.
A fully encapsulating removable cover allows ready access to the motor and drive
for periodic maintenance.
A D.C. thyristor drive control provides the variation in speed
of the rotary fixture, for both the Fixed and Variable Machines.
The fixture speed sets the feed rate which the samples are machined.
An A.C. thyristor drive control provides the variation in the
cutter speed, on the Variable Machine only.
Work Holding Fixture:
The circular fixture allows up to four specimens to be machined during the same operation.
Various clamps, anvils and clamping screws are available to suit the type of rough cut blanks being used.
One circular fixture is included with each machine. For maximum machine production a 2nd fixture (optional extra) is recommended, so that whilst the 1st fixture is being machined, the 2nd fixture can have its samples loaded.
Cutter:
The cutter is fitted with five ISO carbide inserts, which are easily replaceable.
A micro adjuster allows for accurate control of specimen size and allows for compensation of cutter tip wear.
MACHINE SPECIFICATION
Overall Size:
Fixed Speed Machine
900 x 500 x 650 mm
Variable Speed Machine
900 x 500 x 715 mm
Weight: 210 Kg
Electrical Supply:
380 or 415 or 440 Vac
(customer to advise their voltage for setting at our works)
3 phase, 50/60 Hz, 4 KVA
480 Vac optional