Retrofitting an older machine: remake the spindle rather than replace the machine
When an older machine remains broadly capable but its spindle or motor spindle limits what it can do (insufficient speed, wear beyond repair, obsolescence), having it remanufactured to measure often extends the life of the machine at a cost far below full replacement.
The classic dilemma of the older but still capable machine
TLDR: A machine tool of 15, 20 or 30 years old can retain a frame, axes and geometric accuracy that are perfectly valid, while being limited by a spindle that has become obsolete, too slow for current needs, or worn beyond what conventional means can repair. Retrofitting the spindle separates the fate of the machine from that of its most heavily loaded component.
An older machine tool often retains a rigid frame, accurate axes and a geometry still perfectly valid for production — qualities that do not necessarily degrade over time if the machine has been well maintained. The spindle or motor spindle, however, being the most mechanically and thermally loaded component of the machine, often reaches its limits before the rest of the assembly: bearing wear beyond what a standard repair can correct, rotation speed insufficient for current production needs, or plain obsolescence of the installed reference. In that situation, replacing the whole machine would mean discarding a frame and axes that are still perfectly functional in order to solve a problem confined to a single component.
Remaking the spindle to extend the life of the machine
TLDR: A retrofit means having a new spindle or motor spindle designed and manufactured to be compatible with the existing machine — either identical to the old one, or with improved performance (speed, power, clamping system) — without touching the rest of the machine architecture.
Retrofitting an older machine by remanufacturing its spindle means designing a new component compatible with the existing machine architecture (mechanical and electrical interfaces, space envelope, connection to the CNC), without requiring any modification to the frame, the axes or the control system. This new spindle can be designed identical to the old one if the aim is simply to replace an obsolete component, or incorporate performance improvements if the production requirement has changed since the machine was installed — higher rotation speed, increased power, a modernised tool clamping system. This approach allows the production capability of the machine to evolve without starting again from an investment in a new machine.
Typical spindle retrofit cases
- Obsolescence of the original reference, with no like-for-like replacement available from the initial supplier
- Wear beyond standard repair capability, requiring remanufacturing rather than an overhaul
- Need for improved performance (speed, power) to adapt the machine to new production requirements
- Modernisation of the tool clamping system, to accept new standard tooling available on the market
- Willingness to extend the life of a machine whose remaining architecture is still capable
Comparing the cost of a spindle retrofit with that of a new machine
The cost of a custom remanufactured spindle or motor spindle remains, in the vast majority of cases, far below that of an equivalent new machine — without counting the indirect costs of a full machine change: requalification of the production process, operator training on a new interface, extended production downtime during installation and commissioning. A spindle retrofit keeps the existing working environment (programmes, tooling, operator habits) while solving the technical problem confined to the component.
Frequently asked questions
Does a spindle retrofit require modifying the CNC of my machine?
In most cases, no — the aim is precisely to design a spindle compatible with your existing architecture, including the CNC already in place.
Can I ask for a spindle with better performance than the original during a retrofit?
Yes, that is a frequent request: higher speed, more power, or a modernised tool clamping system.
Does a retrofit work on machines of any brand, even those whose manufacturer has disappeared?
Yes, our approach based on direct analysis of the existing component (reverse engineering if required) works regardless of whether the original manufacturer is still available.
What is the typical lead time for a spindle retrofit project?
The lead time depends on the complexity of the project — contact us with the characteristics of your machine for an initial estimate.
Can I keep using my machine while the new spindle is being designed?
Generally yes, unless the current failure already prevents any use — the design work can progress in parallel with operating the machine.
Brochexpress, your partner for extending the life of your existing machines
Our design office and manufacturing workshop, based in Beaurepaire (France) and Lussery-Villars (Switzerland), design retrofit spindles and motor spindles compatible with your existing machines, whatever their brand or age.
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