GRAFS SR- machine for grinding straight industrial blades

GRAFS SR is simple semi-auto grinding machine, designed for sharpening knives used in printing, paper, metal processing, wood and recycling industry. The knife sharpening machine model SR can be supplied in different grinding lengths: mm 1.200, mm 1.800, mm 2.100 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 an electromagnetic 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 knivesgranulator 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.

Easy operation by switches, down feed by manual hand wheel,
Fast grinding wheel motor up and down approach - for fast grinding wheel changing
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),
Quiet and vibration-free special grinding motor
Automatic down feed (mechanical) or manual down feed (depends on the order),
Easy grinding wheel assembly (a special holder developed in our company enables quick assembly of the grinding wheel with 3 clamping screws)
Scale for measuring infeed
External magnetic coolant separator with neodymium magnets, tank with pump for coolant,
Solid welded construction without any vibrations during work,
Smooth adjustment of carriage speed from 1 to 12 m/min (using the potentiometer knob on the panel),
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!
The machine is equipped as standard with the highest quality corundum grinding wheel,
Possibility of mounting different grinding wheel (corundum, CBN, DIA, grinding wheel with segments),
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
Electromagnetic chuck Plate with T channel on the other side
1 unit 150 x 1200 mm (120N/cm2) (Polarity 20 mm) 1 unit 150 x 1200 mm
Grinding wheel motor speed
1450 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
Coolant filter efficiency
60 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 °
Swivel range magnet
+ / - 90 ° (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.


SR can be equipped in the swiveling electromagnetic chuck 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 1 to 12 m/ min.

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


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.

Machine has fast drive of main motor up/down by motor, and slow approach (down feed), by hand wheel. Steering by hand wheel can be also possible during work of the machine.
The electromagnetic table has polarity from 5 mm up to 25 mm (depends from order) and with max force 120N/cm2. Chuck is easily controlled from the control panel.


The machine’s grinding wheel motor is manufactured in one of the oldest polish company: CELMA Inducta. 

Motor is specially reinforced by GRAFS and is equipped with special reinforced bearings with the elimination of axial play.

Is also equipped with a special holder for quick mounting of the grinding wheel with three clamping screws. The grinding wheel can be changed in 1 minute.

In SR model motor is available in several power variants:  4 kW, 5.5 kW, 7.5 kW.

The main motor slide is precisely adjustable and runs on bronze guides.


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).


Constructed of welded steel plates with a thickness of 20 mm. The trolley moves on 4 PWTR rollers with a diameter of 62mm (including 1 on an adjustable eccentric) for precise adjustment of the position of the rollers in relation to the guides. Additionally, on one of the guides, 2 internal fixed rollers and 2 external adjustable rollers are used to guide the trolley evenly in relation to the base.


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.