Most vertical lathes do not fail all at once. They drift. A spindle drive trips on a hot afternoon, a relay that used to be on the shelf now has a twelve-week lead time, and the operator learns to “nurse” an axis that has started to hunt. Each fault is fixed, and the machine keeps running, until the cost of keeping it running quietly overtakes the cost of doing something bigger.

    That is the moment this guide is about: when a maintenance problem turns into an upgrade decision. Below we set out the warning signs, the four realistic options (repair, recondition, retrofit or replace) and how to decide between them.

    Signs your vertical lathe has moved beyond routine maintenance

    If two or more of these sound familiar, it is worth stepping back from fault-by-fault repairs and looking at the machine as a whole:

    • Parts are getting hard to find. Obsolete contactors, relay logic, DC drives or early CNC boards that can only be sourced second-hand or repaired, not replaced.
    • The same faults keep coming back. Intermittent electrical trips, drives that drop out, or axis faults that clear on a reset and return a week later.
    • Accuracy is slipping. Parts need more inspection, more re-work or a skilled operator “knowing the machine” to hold tolerance.
    • Downtime is unplanned. Breakdowns are disrupting delivery dates rather than being handled in planned shutdowns.
    • Only one person can run it. Programming or setting depends on knowledge that sits with a single operator or engineer.
    • Safety has fallen behind. Guarding, interlocks and e-stop circuits no longer meet what you would expect under PUWER.
    • The work has changed. You are being asked for tighter tolerances, shorter cycle times or part programmes you cannot easily store and repeat.

    Your four options

    1. Repair and carry on

    Fixing the immediate fault is the right answer when the machine is otherwise sound, parts are available and breakdowns are rare. It becomes the wrong answer when repairs are frequent, parts are obsolete, or the hidden cost of lost production is larger than the repair bills suggest.

    2. Recondition the mechanics

    Reconditioning restores the mechanical machine: strip-down, slideway grinding and hand scraping, new bearings, gears and seals, and geometry restored to specification. It is the right choice when accuracy has been lost through wear but the controls are still supportable.

    3. Retrofit the controls (CNC modernisation)

    A CNC retrofit replaces the control system, drives, feedback and electrical panel while keeping the cast-iron structure, table and ram. The heavy, expensive mechanical parts of a quality vertical lathe rarely wear out; the electronics do. Our ManuPlus programme typically delivers around 80% of new-machine capability. As a rough guide, a retrofit costs between 30% and 60% of a comparable new machine, often less once foundations, installation and training are counted.

    Retrofit and reconditioning can be combined in one project, addressing mechanical wear and obsolete controls together.

    4. Replace with a new machine

    Buying new makes sense when the structure itself is compromised, when you need a different capacity or configuration, or when the combined cost of reconditioning and retrofit would exceed the value of a new machine. If replacement is the right route, talk to Iain. He can help you compare the options honestly.

    Rebuild vs replace at a glance

    Retrofit / rebuild existing machine Replace with new
    Typical cost Roughly 30–60% of a comparable new machine Full new-machine price, plus foundations, installation and training
    Foundations Usually reuses the existing foundation and services New foundation often required for large machines
    Downtime Typically 4–8 weeks on site for a retrofit Removal, groundworks, installation and commissioning
    Operators Familiar machine with a modern control New machine and new control to learn
    Best when Structure is sound; controls are obsolete or unreliable Structure is worn out, or capacity no longer fits the work

    How to decide

    Work through these questions with your maintenance and production teams:

    1. Is the casting and structure sound? Cracks, major distortion or a worn-out table bearing that cannot be economically restored point towards replacement. Wear on slideways and bearings is normal and can be put right.
    2. Does the machine’s capacity still fit your work? If the swing, height under rail or table load are right, there is rarely a reason to change the iron.
    3. What is downtime really costing? Add up the lost hours, overtime, sub-contracted work and late deliveries over the last twelve months, not just the repair invoices.
    4. How long will parts stay available? If the control is already obsolete, every future failure gets slower and dearer to fix.
    5. Can the work be phased? A retrofit can be staged, starting with the control and adding safety systems or auxiliary functions later, to suit budgets and planned shutdowns.

    What happens next

    The quickest way to a clear answer is an inspection. We assess the machine’s mechanical condition and control system, talk through the work you need it to do, and give you an itemised recommendation: repair, recondition, retrofit or replace. If a retrofit is right, typical lead times for a ManuPlus project run from 8 to 16 weeks depending on scope, scheduled around your production.

    VTT-WB have supported Webster & Bennett vertical borers and turning centres for over 60 years, and work on vertical lathes of other makes too. To talk through your machine, call Iain Exeter on 07808 789597 or Petr Gabrhelik on 07808 789598, or send us a message through our contact page.

    More reading: all VTT-WB guides, used and rebuilt vertical lathes, and how a vertical boring machine works.