Page 79 - Machinery Component Maintenance

64 Machinery Component Maintenance and Repair

float, labyrinth clearance, radial bearing clearance, nozzle stand-
off, coupling bluing check, and coupling advance.
5. Rotor run-out diagram and balance report.
6. Shaft Alignment Diagram- A shaft alignment diagram showing
desired readings based on anticipated thermal growth data, “as
found” readings (prior to overhaul), “as left” readings after over-
haul, and actual measured thermal growth data.
7. Photographs of the overhaul.
8. A discussion of the overhaul. Refer to appropriate photographs
throughout.
9. Recommendations:
For future overhauls.
For reconditioning worn but reusable parts.
For on-line cleaning, if applicable.
For redesigned parts, if applicable.
10. Shift logs and backup data as required.

In writing a report, decide what went right and what went wrong. Fully
identify the causes in each case so that your successor can benefit from
your expcricnces. Scnd a list of spare parts used in the overhaul to the
warehouse controller. While you hope you won’t need parts in a hurry,
don’t bet on it! Decide if you plan to invite the factory serviceperson back
for a subsequent overhaul. In either case, put his name on your report so
no confusion exists on this point. Go back to the machine manual and
make notes in the margin on any errors that may have appeared in the
printed material.
Nonstandard Parts

Once a new machine has operated for a year, it is well to remember that
the guarantee has probably elapsed. In addition, bear in mind that the
original equipment manufacturer’s parts were generally a design com-
promise which took into account a competitive marketplace and existing,
available designs in the manufacturer’s shop. Any parts that fail to stand
up should not necessarily be replaced by standard parts. There are many
excellent aftermarket manufacturers of components and many special-
ized tools such as multiplane milling machines and overspeed spin pits
for individual components. Aerospace technology and materials are be-
ginning to filter down to the aftermarket also. None of the above should
be construed as an indictment of the equipment manufacturer, but when
his spare part pricing, policies, and failure to solve design problems
mount to a point where it becomes necessary to put properly engineered
aftermarket components into a machine, do not hesitate to do what is best
for your company.