1500mm Electromagnetic Chuck Knife Grinding Machine 3.7 kW 4.7 kW Total Power

Long knives are the ones nobody wants to sharpen. A 1500 mm blade will not fit on a bench grinder, it is awkward to clamp, and sending it out means the machine it belongs to stands idle for the round trip. That is why long knives get run long past the point where they should have been ground.

The MJ-21500 is a 1500 mm knife grinding machine built for that job. The bed is an electromagnetic chuck rated at ≥150 N/cm², so the knife is held across its whole face rather than clamped at two points, and there is nothing standing up in the path of the wheel. The chuck measures 1500 * 160 * 170 mm.

The head is driven along the bed by a 0.85 kW servo motor at 1–10 m/min, so the pass rate is set rather than pushed. A 3.7 kW wheel motor does the cutting, and the whole machine draws 4.7 kW in total. The bed is a water trough, so the knife is ground wet — which matters most on exactly this kind of work, because a long edge is the hardest one to keep cool.

The machine carries an automatic lubrication pump (DCR-50/1C) that oils the ways while the machine is running, so the X axis is not left to a maintenance schedule. Setup is on a touchscreen mounted on a column beside the bed. The machine stands 2320 * 980 * 1830 mm, weighs 716.5 kg and runs on a 220 V supply.

Three numbers define this machine: 1500 mm of knife, 150 N/cm² of chuck, and 4.7 kW of installed power.

• Maximum grinding length 1500 mm — takes the long knives other knife grinders cannot.
• Electromagnetic chuck, ≥150 N/cm² — the knife is held across its whole face, not clamped at two points.
• Chuck face 1500 * 160 * 170 mm — the chuck is long enough to carry the knife over its full length.
• 3.7 kW wheel motor — spindle power for a full pass over a 1500 mm edge.
• 0.85 kW feed servo — the head is driven along the bed rather than pushed by hand.
• Feed rate 1 – 10 m/min — the pass rate is set, so the bevel is even along the edge.
• X axis motor 250 W — drives the carriage along the bed.
• Total installed power 4.7 kW — what the machine draws in total.
• Water trough under the work bed — the knife is ground wet, which is what keeps a long edge from burning.
• Automatic lubrication pump (DCR-50/1C) — oils the ways while the machine runs, rather than waiting on a maintenance schedule.
• 40 W coolant pump — delivers coolant through segmented nozzles to the cutting point.
• Touchscreen on a column beside the bed — the operator sets the pass from where the knife is.
• 716.5 kg, 2320 * 980 * 1830 mm — a floor machine on adjustable feet, heavy enough to hold its setting.
• 220 V supply — as given on the machine nameplate.

If your shop runs long knives, this is the machine that stops them leaving the building — and stops them being run blunt.

• 1500 mm of knife, in-house. The bed takes a 1500 mm edge, so a long knife is ground and put straight back on the machine instead of being held over for a round trip.
• The chuck holds the whole face. ≥150 N/cm² applied across a 1500 * 160 mm face is what keeps a long knife from lifting mid-pass — and what lets the full edge be ground in one setting.
• A pass rate, not a push. A 0.85 kW servo drives the head at 1–10 m/min, so the bevel is the same depth from one end of the knife to the other.
• Power for a full-length pass. 3.7 kW at the wheel, 4.7 kW total — enough to take a full pass over 1500 mm without loading up.
• The ways oil themselves. An automatic lubrication pump runs while the machine is cutting, which is when the ways are actually under load.
• Wet grinding, which matters most here. A long edge has the most time to heat up, so the water trough under the bed is doing more work on this machine than on a short one.

Up to 1500 mm. The chuck face is 1500 * 160 * 170 mm, so the knife is carried over its whole length.

By an electromagnetic chuck rated at ≥150 N/cm². Holding is applied across the whole face, so the knife does not lift during the pass and nothing stands in the wheel's path.

1 – 10 m/min, driven by a 0.85 kW servo motor. The rate is set, not pushed.

3.7 kW at the grinding wheel. Total installed power for the machine is 4.7 kW.

Yes. The bed is a water trough and a 40 W pump delivers coolant through segmented nozzles to the cutting point.

Automatically. An automatic lubrication pump (DCR-50/1C, 220 V, 50 ml/min) oils the ways while the machine is running.

716.5 kg, standing 2320 * 980 * 1830 mm on adjustable feet.

Long straight knives and blades — the kind used in woodworking, plastics and paper processing, where the knife is too long for a bench grinder.

220 V, as given on the machine nameplate, confirmed against your supply before the order is placed.

MOQ is 1 set, lead time is 5–8 working days, payment is by T/T, and the machine ships in an export-standard plywood case.