SR150 – machine for grinding straight industrial blades

GRAFS SR150 grinding machine is designed for sharpening knives used in printing, paper, metal processing, wood and recycling industry. The knife sharpening machine model SR150 can be supplied in different grinding lengths: mm 1.200, mm 1.800, mm 2.000 and mm 2.400.
The grinder has a number of improvements to achieve high-quality sharpening for many years of use. It can be equipped with a rotating manual neodymium magnetic chuck, it is also possible to order machine with special tool with clamps for fixing knives. Angle from 0 to 120 degrees. Proper cooling of the sharpened surfaces is ensured by a cooling system with a tank and magnetic coolant cleaner with rotating discs – model MS40.
Developed in our firm the special holding segment allows for quick and easy removal and fastening of the grinding wheel with three clamping screws.
The carriage is equipped with the best class rollers (PWTR) which ensures quiet and smooth operation.
In addition, as standard, the grinder is equipped with a slide carriage speed control
system (potentiometer and inverter).
The machine is perfect for sharpening chipper knives, granulator blades, veneer knives
where rough machining is needed.
The machine is equipped with a standard corundum grinding wheel for sharpening knives.
The machine has all necessary electrical tests and CE DECLARATION, build in Poland on European components.

Fast grinding wheel motor up and down movement - for grinding wheel changing
Automatic (mechanical) or in cheaper version: manual down feed, spark-out function, down feed right from 0,003 mm to 0,03 mm
Adjustment of carriage speed from 1 to 12 m/min (using the potentiometer)
Quiet and vibration-free special grinding motor
Grinding motor 4 kW with holder for grinding wheel size range Ø from 150 to 250
Easy grinding wheel assembly (a special holder developed in our company enables quick assembly of the grinding wheel with 3 clamping screws)
Possibility of assembly different grinding wheels: CBN, DIA, Corundum grinding wheel, Grinding wheel with segments
Manual neodymium swiveling magnetic chuck / table (angular divisor for magnetic chuck +/-90°) or in cheaper version: table with fastening clamps
Scale for measuring infeed
Efficient sharpening of both mild steel and increased hardness such as NC11LV, HSS, HM carbides (it is recommended to attach a paper separator PS for carbides grinding)
External tank with pump for coolant (in standard)
Welded construction without any vibrations during work
The whole carriage can be moved relative to the trolley, thanks to this function we can sharpen / grind wider objects. e.g. knives up to 350 mm wide!
We provide training in the operation of the machine and material advice
The machine is adapted to individual customer needs
Max grinding lenght
1200 mm, 1800 mm, 2000 mm, 2400 mm
Max grinding width*
200 mm
Grinding wheel motor speed
1400 rpm (switched right/left)
Carriage speed
1m/min - 12m/min (smooth regulation)
Grinding motor power
3,5 kW, 4 kW, 5,5 kW, 7,5 kW
400 V – 50 Hz – 3 f
Weight (depends on model)
1300 kg
Width x height of the machine
1000 mm x 1500 mm
Coolant filter efficiency
40 L/min
Coolant tank cappacity
150 L (up to 300 L - upon request)
Grinding wheel (every type: corundum, CBN, DIA, Grinding wheel with segments)
⌀ 150 - 250 mm
Grinding motor swivel
+ / - 10 °
Manual clamping magnet force (permanent)
Swivel range magnet
+ / - 120 ° (Polarity 20 mm)
The machine is built in accordance to: 2006/42/WE, 2006/95/WE, PN-EN ISO 12100, PN-EN 60204-1:2010/AC:2011, PN-EN ISO 13849-1:2016-02, PN-EN ISO 13857:2010, PN-EN ISO 14120:2016-03
*The grinding width range can be increased due to the carriage advance function relative to troley.
Designed for more efficient filtration of coolant, especially required when grinding carbides (HM).
CBN Grinding wheel ⌀ 250 mm
Grinding wheel with insert made of HSS, NC10, NC11 (adapted to the customer's needs).
Diamond Grinding wheel ⌀ 200 mm
Grinding wheel for sharpening knives with carbide insert HM (adjusted to the customer's needs).
Grinding wheel with corundum segments ⌀ 250 mm
Grinding wheel for more efficient sharpening of knives, where a quick material removal is required (e.g. knives for mills, crushers, chipper knives). We adapt the grinding wheel to the customer's needs.
Specialist full-day training (STEEL SS, NC, HSS) at the customer's premises.
Training in the field of professional knife sharpening, (the price does not include travel costs).



Transparent functions on the panel allow for easy and efficient operation of the machine.

The carriage speed is set by the potentiometer knob. The position of the grinding wheel relative to the surface is indicated by the scale, simple turn on and off – motor, carriage run and cooling system – by switches.


Machine can be equipped in the swiveling manual magnetic chuck with permanent neodymium magnets and / or table with special clamps. These two systems allows for secure fastening of the workpiece and precise grinding angle setting in the range from 0 to 90 degrees.


The machine is equipped with an inverter for regulating the carriage speed from 2 to 12 m/ min.,

All electronic components are high quality products from proven, mainly European manufacturers.


Specially designed holder allows for mounting different types of grinding wheels: ringwheels, segmental heads, diamond and CBN wheels (diameter from 150 mm up to 250


The grinder has covers to prevent excessive release of coolant dust during grinding.

The amount of coolant fed to the machine by pump can be freely adjusted.

The whole carriage can be manually positioned over the workpiece, which prevents the abrasive wheel from accidential hitting the workpiece.


The machine’s grinding wheel motor is equipped with a special handle developed by GRAFS for quick mounting of the grinding wheel with three clamping screws. The grinding wheel can be changed in 1 minute.
Motor is available in several variants: 4 kW, 5.5 kW, 7,5 kW and 11 kW.

The motor is equipped with special reinforced bearings with the elimination of axial play.


The machining coolant filtration module developed and built in our company consists of a magnetic separator with rotating neodymium magnets (for removing magnetic spoil) and a paper separator – fig. next to it (for removing non-magnetic spoil, e.g. dust from abrasive of grinding wheel).

The combination of both filters gives a high level of coolant purity which translates into quality and speed of sharpening process.




The machine support can be manually positioned over the knife, which allows for secure positioning of the grinding wheel disc relative to the workpiece.

Thanks to the possibility of sliding the carriage relative to the troley, it is also possible to sharpen / grind objects of larger widths (up to 350 mm).



The machine base is made of electrowelded steel sheets with appropriate ribs, which makes the whole structure extremely stable. The rigid structure helps to avoid any vibrations or deflections during machining.

The base is available in several lengths enabling the grinding range: 1200 mm, 1800 mm, 2000 mm, 2400 mm.

As a carriage running system, there are two steel guides equipped with hardened straps of appropriate hardness. High-strength PWTR rollers move on the straps. This solution is more durable than standard linear systems used in CNC machines.