HAAS Spindle Repair SK40

We received a HITECO QE-1F 12/12 24 63F NC CB electrospindle for urgent repair. The HSK tool holder was damaged due to a collision. The main issue was a broken and cracked HSK gripper arm, which prevented the machine from continuing operation.

After receiving the spindle, we began disassembly and cleaning of all components. Each part was cleaned in ultrasonic and mechanical baths, which allowed us to carry out precise geometric measurements and damage diagnostics.

The FISCHER MFW-1224/42 VC HSK-E40 electrospindle operates in very demanding conditions: rotational speed up to 42,000 rpm, HSK-E40 tool interface and a high-precision SPEED HAWK 650 machining center. Under such parameters even minor wear of the bearings, taper or clamping unit quickly leads to reduced surface quality, increased vibration and shorter tool life.

The electrospindle was collected directly from the customer, located approximately 200 km from our service center. On the same day, we carried out a damage analysis and identified severe damage to the HSK taper gripper arms, as well as significant vibrations and loud operation of the rear bearings.

An extremely damaged GMN spindle arrived at our service center, with the SK40 taper severely worn due to prolonged use without prior servicing. The spindle underwent a full overhaul process – from disassembly and diagnostics to component repairs, followed by final testing and dynamic balancing.

Our CNC service received as many as three HSD ES 959L electrospindles designated for operation in a machining center ROVER B. Two of them were sent as damaged units, while the third one was marked by another service as “beyond repair” and intended as a donor for spare parts.