Mining equipment parts,
machined for the duty.
A mine runs on uptime. We machine the girth gears, shells, crusher shafts, sheaves and hoist wheels that keep the milling and hoisting circuit turning — to your drawing, or measured from the part that came out.
Parts we machine for mining
- Mill girth gearssplit or one-piece, pre-assembled before dispatch
- Ball mill shellsrolled shell, machined flanges and end-cover fit
- Crusher main shaftsforged shaft, journals and taper fit
- Grinding roll assembliesroll body and bearing seats
- Mine hoist friction wheelsrope groove profile and hub fit
- Sheaves and rollersrope groove and bearing bore
The milling circuit wears as a set
A mill girth gear, its pinion, the shell and the trunnion bearings share one alignment. When the gear is worn the pinion usually is too, and a new gear on an old pinion wears quickly. Where both parts come to us they are cut and checked as a pair; where only the gear is replaced, the contact pattern is checked against the pinion drawing before dispatch.
Crushers take impact, not only torque
Cone and jaw crushers put shock into the main shaft and the frame. The shaft is forged, ultrasonically tested where specified, and machined with the taper and journals referenced to the same centres. A shaft that is straight but out of reference will still run hot, so the datums are agreed at drawing review.
Hoisting and conveying
Mine hoist friction wheels, wire-rope sheaves and conveyor idlers are judged by the groove, the bearing bore and the hub fit. We machine the rope groove to the drawing profile, check the bore against the bearing seat, and mark the lifting points before packing.
Material and heat treatment
Blanks arrive as castings, forgings or rolled rings with a mill certificate, and the grade is verified on receipt. Quenching and tempering precede tooth cutting; induction hardening follows where the drawing calls for a hard tooth surface. Hardness and case depth are recorded, and any substitute grade is agreed with you before machining.
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, induction hardening and inspection are under one roof, so a large mill part does not travel between suppliers.
Inspection before dispatch
Ultrasonic testing on the blank where specified, hardness after heat treatment, and a dimensional record covering bore, face runout, pitch and tooth thickness. Reports travel with the part and can be issued in English. If your maintenance team works to a fixed template, send it with the enquiry.
When the drawing is gone
Older mills and hoists often outlive their paperwork. Send the worn part or its mating pinion; we measure the references that did not run, reconstruct the tooth data and issue a drawing for your approval before cutting. One piece is enough — there is no pattern charge and no minimum order.
Mining plant questions
- Can you reverse-engineer a mill girth gear?
- Yes. Send the worn gear or its mating pinion and we measure the unworn references, reconstruct the module and tooth count, and send the drawing back for approval before machining.
- Do you machine the pinion together with the gear?
- Where both parts come to us, yes. Cutting and checking them as a set is the most reliable way to keep the contact pattern right when the old pinion is also worn.
- What is the largest mining 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. Send the size and we will confirm the set-up before quoting.
- 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 worn part.
Tell us the mill or hoist, the part and what it is doing. We reply with what we can measure, the material questions we still need answered, and a date.
Send a drawing or a photo