Wind turbine parts,
built for cyclic loads.
Wind turbine parts see the same load millions of times. We machine main shafts, yaw and pitch ring gears, bearing housings and large flanges to drawing, with the forging, heat treatment and inspection route agreed before cutting.
Parts we machine for wind power
- Wind turbine main shaftsforged shaft, journals and flange
- Yaw and pitch ring gearsexternal or internal teeth, hobbed or shaped
- Internal ring gearsinternal teeth and bearing fit
- Bearing housingssplit housings and seal seats
- Coupling hubs and flangesforged hubs, bolt pattern and bore
- Castings and forgingsverified on receipt, then machined
The main shaft carries the rotor load
A main shaft is a forging that has to stay true through millions of load cycles. The blank is verified against its mill certificate, ultrasonically tested where specified, and machined with the journals and flange referenced to one centre line. Bearing and seal seats are finished last.
Yaw and pitch ring gears
Yaw and pitch gears are ring gears with internal or external teeth, usually hardened after cutting. We hob or shape the teeth to the drawing, record hardness and case depth, and check pitch and runout before dispatch. Split rings are pre-assembled and match-marked.
Housings and flanges
Bearing housings and flanges are judged by bore fit, face flatness and bolt pattern. We machine the bore and the mounting face from one set-up where the drawing allows, then check the bolt holes against the mating part. Seal seats are finished last.
Material and inspection
The grade on the drawing is verified on receipt; if it is unavailable we propose an equivalent and state the difference. Ultrasonic testing, hardness and dimensional records are added as the drawing requires, and reports can be issued in English.
What the shop can hold
Gears up to 8 m outside diameter, work up to 8 m in turning diameter, shafts up to 12 m between centres, and single castings or forgings up to 35 t. Hobbing, shaping, heat treatment and inspection are in the same workshop.
Small batches and spares
A wind farm needs a spare, not a production run. One piece is enough — there is no pattern charge and no minimum order. Where the drawing is missing, we measure the worn part or the mating part and issue a drawing for approval before cutting.
Packing for a remote site
Journals and seal seats are protected, lifting points are marked, and crates are packed for sea or road freight with rust protection. The packing list names every piece so the site can check the delivery against the drawing set.
Wind power questions
- Can you machine a replacement main shaft without a drawing?
- Yes. Send the worn shaft or the mating part and we measure the unworn references, reconstruct the journals and flange, and issue a drawing for approval before machining.
- Do you harden yaw and pitch ring gears?
- Where the drawing specifies a hard tooth surface, yes. Hardness and case depth are recorded after heat treatment and checked against the drawing before dispatch.
- What is the largest wind turbine part you can machine?
- Gears up to 8 m outside diameter, turning work up to 8 m, shafts up to 12 m between centres, and single castings or forgings up to 35 t.
- How long does a replacement take?
- Usually four to eight weeks from the approved drawing, depending on size, module and heat treatment. The date is confirmed with the quotation.
Send the drawing, or the part that failed.
Tell us the turbine, the part and the load case it sees. We reply with what we can measure, the material questions we still need answered, and a date.
Send a drawing or a photo