Journal Machining

Journal Machining Process

The process includes multiple services in which the severity of a failure or condition of the Crankpin Journal is assessed. This allows a plan to be put in place for machining operations to take place. The process may include all or some of the following services: Crack Detection, Hardness Testing, Geometric Tolerance Checks, Run Out Checks and Exploratory Grinding.

A specially manufactured machine is utilised to machine the Journal to remove any damage or wear and restore OEM specified tolerances to the diameter, radii and any seal/wiper areas

A process in which a specialist piece of equipment holding a carborundum stone oscillates from side to side around 30 times a second to flatten off the surface of the Journal after the machining process

Machine polishing process is the final process to ensure flatness and other geometric tolerances are maintained whilst producing the OEM specified surface finish.

Additional Services If required

Where as most shafts and Journals cannot be rotated for the machining process, on occasion this is not the case. If space allows, In-Situ offer a Journal turning service in which the Shaft is rotated by a bearing gear (or a vary speed bearing gear can be designed and supplied by In-Situ) and turned in a conventional manner. In-Situ can design and manufacture specialist fixtures to mount a tooling slide alongside the Journal and machine the Journal as it rotates as the desired speed.

Annealing of the Journals can be undertaken to reduce heat induced hardness within the journal that is above OEM specification. This service is undertaken via a resistance heat treatment method in which a process of controlled heating, soaking and cooling of the effected Journal with ceramic blankets is undertaken.