When a centrifuge manufacturer has stopped supplying parts, Sentrimax can reverse-engineer replacements from the worn or broken original: capturing exact dimensions, verifying the base material, and machining a new part to OEM tolerance. This applies most often to legacy Sharples, Bird and Hutchison Hayes units still running in the field.
Why Legacy Centrifuges Run Out of Parts
The question of what to do about a discontinued part usually shows up at the worst possible time – after a failure, with the machine already down and a normal parts search coming back empty. Knowing in advance that reverse engineering is an available path, rather than discovering it mid-crisis, is often the difference between a planned repair and an extended, unplanned outage while options are researched from scratch.
Decanter and tricanter centrifuges are built to run for decades, but manufacturers do not support every model that long. Companies get acquired, product lines get discontinued, and drawings for a machine built thirty years ago can be genuinely unavailable even from the manufacturer’s own successor organization. None of that means the machine is done. It means the part has to come from somewhere other than a catalog order, and reverse engineering is that alternative.
This is a more common situation than it might seem. A centrifuge that was a mainstream model when it was installed can end up as a legacy unit after a manufacturer consolidation, a change in ownership, or simply a shift in the OEM’s product line toward newer designs. The centrifuge itself may still be running perfectly well mechanically, with years of useful life left in the housing, drive train and structural components – the only thing standing between it and continued service is a single worn part that nobody stocks anymore.
The Reverse Engineering Process
Sentrimax’s engineering services and machine shop reverse-engineers parts using the worn or broken original component as the source, not a manufacturer drawing.
- Dimensional capture. The original part is measured in detail to record its true geometry – critical fits, clearances, thread specifications and surface features – even where wear has changed some dimensions from their original values.
- Material verification. The base material of the original part is identified so the replacement is produced in a metallurgically appropriate material, not simply a visual match.
- Machining to OEM tolerance. A new part is milled, turned or ground to the tolerances the original design required, correcting for wear captured in the dimensional survey so the new part fits and performs as the original did when new.
What Dimensional Capture Actually Involves
Dimensional capture is not a single measurement. It means identifying which surfaces on the worn part are functional – bearing seats, sealing faces, mating fits with adjoining components – and distinguishing genuine design dimensions from wear that has changed the part over years of service. A part that has been in service for years rarely measures exactly as it did when new, so part of this step is judgment: recognizing where a dimension has worn away from its original value and correcting for that in the replacement, rather than simply reproducing the worn part’s current measurements. Getting this step right is what separates a replacement part that fits correctly from one that technically resembles the original but does not perform the same way in the assembly.
Verifying Material Before Cutting Metal
Two parts that look identical can be made from different alloys, and using the wrong one can mean a replacement that wears faster, corrodes in service, or does not hold the required hardness after hard surfacing or coating work. Material verification confirms what the original part was actually made from before a new one is machined, rather than assuming a match based on appearance. This step matters particularly for wetted components exposed to abrasive or corrosive feed, where the wrong base material can undermine the benefit of a correctly captured dimension almost immediately in service.
Machining to OEM Tolerance and Fit Testing
Once dimensions and material are established, the replacement is machined to the tolerances the original design specified. Milling, lathe-turning and precision grinding are used depending on the part’s geometry and which surfaces need the tightest tolerance, such as bearing seats or sealing faces. Where the part is a rotating component, it is balanced to ISO G 0.5 after machining, the same standard applied to every rotating assembly Sentrimax rebuilds, whether the part is new-manufactured, reverse-engineered, or repaired. Fit is checked against the mating components it will assemble with, not just against the dimensional record taken from the original, since a replacement part ultimately has to work correctly inside the rest of the machine, not just match a set of numbers on paper.
Reverse Engineering Versus Sourcing a Used Take-Off Part
Both options can end up being reasonable depending on the part and the urgency involved, but they are not equivalent, and treating them as interchangeable is where problems tend to start.
When a part is discontinued, the other option that often comes up is trying to source a used take-off part from a decommissioned machine of the same model. That can work, but it comes with its own uncertainty: a used part carries its own unknown wear history, and there is no guarantee its dimensions are any closer to the original design specification than the worn part already on the machine. Reverse engineering produces a part machined to a verified dimension and material, corrected for the wear found on the original, rather than substituting one part of unknown condition for another.
Reverse Engineering Alongside a Full Overhaul or as a Standalone Job
A reverse-engineered part can be produced on its own, as a single replacement for a machine that is otherwise running fine, or as one line item within a broader overhaul. When it is part of an overhaul, the reverse-engineered component is scoped and produced within the same Stage 1 inspection and Stage 2 repair sequence used for the rest of the machine, so it is balanced, quality-checked and included in the same test run and performance report as the rest of the rebuild. The Revisión y reconstrucción de la centrífuga hub covers that broader process in full.
Which Legacy Brands This Applies To
Reverse engineering comes up most often for older Sharples, Bird and Hutchison Hayes units, along with other legacy models such as GEA Westfalia, SWACO 518 and 414, Sharples PM-95000, and older Alfa Laval and Tomoe models where a specific part is no longer stocked. Sentrimax is an independent service provider and is not affiliated with, authorized by, or endorsed by any of these manufacturers; reverse engineering does not require manufacturer cooperation or original drawings. This capability is used across the same range of applications Sentrimax otherwise supports – municipal water and wastewater, environmental services, dewatering, energy and utilities, food and beverage, mining, biotech and pharmaceuticals, chemicals, manufacturing, recycling, pulp and paper, and agriculture – since legacy equipment shows up in all of them, not just in one industry.
A discontinued model is not the same as an unrepairable one
The fact that a manufacturer no longer lists a model, or has stopped answering parts inquiries for it, says nothing about whether the machine itself is still mechanically sound. It only means the part has to be sourced a different way.
What to Send for Evaluation
A useful starting point for a reverse engineering request includes whatever is on hand, even if the set is incomplete. There is no minimum requirement to get started – a single worn part with no accompanying paperwork is enough to begin dimensional capture and material verification. Anything beyond that simply gives the process more to work from.
- The worn or broken original part, if it is available
- Any nameplate, serial number or model tag information from the centrifuge
- Original manufacturer drawings, if any still exist
- Photographs of the part in place, showing how it mates with adjoining components
- A description of how and when the part failed or was found to be worn
When Reverse Engineering Isn’t the Right Call
Reverse engineering makes sense when a part is genuinely unavailable through normal channels. It is not the first option when a common wear part can still be sourced, or when the underlying problem is better addressed as a broader repair. Decanter centrifuge repair y centrifuge troubleshooting cover how Sentrimax approaches diagnosis and repair scope more generally, including cases where the fix does not require a reverse-engineered part at all. There is also no benefit to reverse-engineering a part that a straightforward parts search would turn up faster and at a known specification – the process exists specifically for the cases where that search comes up empty.
Starting a Reverse Engineering Request
The Taller de maquinaria y ingeniería para centrífugas hub covers the full range of milling, turning and grinding capability that reverse-engineered parts are produced with, along with how that capability supports gearbox repair and controls work on the same legacy machines. Sending in the part, or as much supporting information as is available, is the first step toward a replacement, and it commits you to nothing more than an evaluation of what is possible for that specific component.
Preguntas frecuentes
Do you need the original manufacturer's drawings to reverse-engineer a part?
No. Drawings help when they exist, but Sentrimax routinely reverse-engineers parts using dimensional capture and material verification from the worn or broken original component alone, without needing manufacturer cooperation or documentation.
Can a part be reverse-engineered if it is badly worn or partially broken?
Often, yes. Dimensional capture accounts for wear by identifying which measurements reflect the original design intent versus wear that occurred in service, so a worn or partially damaged part can still serve as the source for an accurate replacement.
Will a reverse-engineered part fit as well as an original OEM part did?
The goal of machining to OEM tolerance is exactly that: a replacement that fits and performs to the same specification as the original design, verified through dimensional capture, material verification and machining before the part is balanced and installed.
Which centrifuge brands most often need reverse-engineered parts?
This comes up most frequently for older Sharples, Bird and Hutchison Hayes units, along with other legacy models such as GEA Westfalia and SWACO units, where the original manufacturer has stopped supplying parts for the specific model.
Is reverse engineering only for major structural parts, or can smaller components be done too?
Reverse engineering can apply to components of any size, from small precision fittings to larger structural parts of the rotating assembly. The decision is based on part availability, not the size or complexity of the component.
Hable con un especialista en centrífugas.
Envíenos los detalles de la máquina y le enviaremos un informe de inspección y un presupuesto.