When a shaft fails at three in the morning, the question is rarely whether it can be repaired. It is how quickly someone competent can be standing in front of it.
Most engineering firms advertise emergency response. Fewer explain what that involves. If you have never used an in-situ machining team before, here is what happens from the moment you pick up the phone, and what we will need from you at each stage.
The First Call
The first conversation is diagnostic, not commercial.
What we need to establish quickly is what has failed, what it is attached to, and what access looks like. The questions are usually the same: what is the component, what are the approximate dimensions, what material, what is the nature of the damage, and can we physically get equipment to it?
You will not always have those answers, and that is expected. Photographs help more than descriptions. If you can send images of the damage and the surrounding access from a phone while we are still talking, we can usually tell you within that call whether this is a job that can be done in situ.
At this stage, we’re deciding whether the repair is viable in place at all. Our guide to when in-situ crankshaft and crankpin repair is possible covers where that line sits for crankshaft work specifically. Saying no early is more useful to you than mobilising and discovering the problem on site.
Scoping and Mobilisation
Once we understand the job, two things run in parallel.
The technical side is working out which equipment goes on the vehicle. In-situ machining equipment is job-specific rather than general purpose, and a line boring set-up for a bedplate differs from a flange facing rig or a crankpin machine. Getting this right before departure matters, because a return trip for the wrong tooling costs you a day.
The logistical side is access, permits and site requirements. Offshore, marine and petrochemical sites generally have their own induction, permit-to-work and certification requirements, and these frequently take longer to clear than the engineering. If you can start that process at your end while we are mobilising, it removes the most common source of delay.
Note: The time between your call and work starting is usually dominated by access and permits rather than travel or preparation. The sites that recover fastest are the ones that begin the paperwork during the first phone call.
On Site: Survey Before Cutting
Nothing gets machined on arrival.
The first task on site is measurement. We need to establish the actual condition of the component and its geometry as it currently sits, not as the drawing says it should be. Wear is rarely even, alignment has often moved, and the datum you machine from determines whether the repair works.
This is the stage that separates a repair that holds from one that comes back. Machining to the original drawing without establishing what has happened to the assembly is how components end up out of alignment with everything around them.
Expect this to take time and expect questions. Original drawings, maintenance history and any previous repair records are all useful. If the component has been repaired before, we need to know.
The Machining Itself
The set-up usually takes longer than the cutting.
In-situ machining means bringing the machine to the component rather than the component to the machine, so the equipment must be mounted, aligned and proven against the datum established during the survey. Alignment is the job. Once the set-up is right, the cutting is comparatively quick.
Work often runs continuously through shifts where the site is down, because the constraint is your production rather than our hours. That is the practical meaning of a 24/7 service, and it is worth confirming with any supplier that it means continuous working rather than simply an answered phone.
Depending on the repair, additional processes may run alongside. Crankpin work frequently requires annealing and heat treatment, and cracked castings may need metal stitching rather than machining. These are decisions taken on site once the survey is complete.
Verification and Handover
The repair is not finished when the cutting stops.
Dimensions are verified against the tolerances the application requires, and you should expect a record of what was found, what was done, and what the finished geometry measures. For insurance, class or regulatory purposes, that documentation frequently matters as much as the repair.
You should also expect a view on why it failed. A bearing journal that has worn unevenly is telling you something about alignment or lubrication, and a repair that does not address the cause will be repeated. Where we can see a contributing factor, we will say so.
What Slows Things Down
In our experience, the delays in emergency work are rarely technical:
- Site access and permits not started until the team is en route
- No drawings or maintenance history available, so more survey time is needed
- The extent of damage being greater than the initial description suggested
- Additional components found to be affected once the area is opened up
- Decisions requiring sign-off from people who are not available out of hours
The last one is worth planning for. If your emergency procedure does not name who can authorise additional work outside office hours, that is worth fixing before you need it.
Before You Need Us
The most useful preparation is knowing which of your assets would be candidates for in-situ repair before one of them fails and having drawings accessible rather than archived.
We work across marine, petrochemical, power generation, mining and heavy industry, and the pattern is consistent: the sites that recover quickest are the ones that had the conversation before the failure rather than during it.
If you want to understand what could be repaired in place on your own plant, that is a conversation worth having now rather than at three in the morning.