Injection molding

I ponder whether to answer this request, as if you get the job from this information, then did you really earn the opportunity. But then, maybe this is an example of using the available resources to solve problems.

Following is a rudimentary summary, posted not just for you, but anyone else who searches the system for such material.

Maintenance periods will vary by type of machine, usage per day and will be different for different parts of the machine system. Consult the manufacturer's handbooks.

Motors and hydraulic system will require appropriate filters and cleaning of fans relatively frequently. Replace filters at recommended periods, sample oil and have specialist laboratory analyse to determine levels of impurity and replace/re-condition oil before contamination/deterioration becomes of concern.

A replacement "screw" would be a nice spare to have so if the screw in use becomes broken, worn or significantly contaminated it can be swapped and machine returned to service rather quickly. Brushes for inside of barrel are essential for removal of contaminants. Screws should only need to be removed rarely, but EVERY time they are out, they should be measured for signs of wear in the relevant zones of the machine. Experienced team of two should be able to remove, clean , measure and inspect and replace screw for 350T machine in around 3 hours, 40T machine in around 90 minutes.

You may need multiple replacement screws dependant upon material types being processed.

Replacement check rings and heater bands (especially for the nozzle) are essential spares.

Depending upon the number of machines in the shop it may be prudent to have a complete interchange injection unit (barrel and screw) with a different diameter allowing processing of smaller shot size in the same machine.

A stack of thermocouples and electrical spares for the machine are handy as well as service kits for the heat exchangers/die temperature controllers that you will encounter.

Another handy item is a kit to replace die coolant hoses. (hose and fittings) While these could be seen as part of the tool and not the machine, you may be called upon to repair them.

Finally the essential item: The machine manufacturer's maintenance handbooks for the machine that you have. (That way you can order the correct replacement spare when something that you don't have gets broken.

You can build on this kit by refurbishing important parts that break down (Like computer cards, oil valves and so on) so that next time you have a functional spare.

Good luck with the interview. I suspect though that the interview will be more on interpersonal activities, co-ordination of multiple tasks rather than specifics about maintenance periods on a specific type of machine.