So next time a scored or damaged shaft or turbine journal threatens your production, contact Nicol & Andrew Group to put it right.
How can a maintenance engineer repair a damaged shaft journal (bearing) quickly and accurately without having to strip the shaft from the unit whilst keeping any downtime to an absolute minimum?
The answer lies in utilising an orbital machining system developed during over 60 years of constant use doing just that.
Our in house designed Orbitool system rotates around the stationary shaft referencing unworn datum areas either side of the damage. The system allows us to machine and polish a damaged shaft to a (tightly toleranced) required undersize ready for a new bearing.
Downtime (and therefore cost) is kept to an absolute minumum and you do not need to strip the shaft out from the unit.
We cater for sizes from as small as 75mm diameter up to (and over if required) 1500mm.
Types of shaft repairs regularly carried out by Nicol & Andrew Group include: -
- Trunnion Shafts
- Coal Pulveriser shafts
- PA Fan Shafts
- Pump Shafts
- Generator Shafts
- Compressor Shafts
- Motor shafts
- Propeller shafts
How we proceed with a shaft repair.
We will require information from the customer to assess what accurate reference datums are available.
Then, based on the parent metal specifications, current state of the bearing journal (scoring, heat damage etc.) plus pictures and detailed engineering drawings, we put forward a repair procedure utilising our orbitool machining equipment.
Some of the common methods of repair are mentioned below as a guide.
Machine the bearing journal undersize and polish to a required size and surface finish ready to accept an undersized bearing.
Pre-machine the shaft journal diameter undersize to allow for a method to bring the shaft back up to standard size: -
- Metal Spraying
Subsequently we will finish machine and polish a tight tolerance to accept a standard size bearing.