M&B engineers have
on nearly every
class of machine.
We are one of the few vendors who can provide quality optical measurement
services. These two specific areas are required to provide
you with accurate operating machinery alignment.
We can identify and help you quickly correct existing problems caused by
misalignment, and problems related to foundations, baseplates and piping. We
can also provide your staff with specialized
alignment training to improve their
skills and increase your reliability.
The alignment between
main bearing saddles, crosshead guides to cylinder bore and the
perpendicular relationship between the main bearing centerline and crosshead
centerline can be easily verified using optical measurement techniques.
These checks would normally be performed during new unit installation prior
to grouting, for evaluation after equipment failures, or during re-grouting
of older existing equipment.
The optical system used
consists of target centering devices holding wire crosshair or glass pattern
targets and a precision line scope. A main bearing saddle alignment check is
performed with the crankshaft and bearings removed. If the check is being
prformed prior to initial grouting or re-grouting of an existing unit, the
crankcase is first leveled. This leveling operation may also be quickly and
easily performed using optical measurement techniques.
The optical line scope
is mounted on a universal adjusting bracket fastened to one end of the
crankcase. Targets are centered in each main bearing saddle. Typically, the
telescope is adjusted to the axis defined by the first and last bearing
saddle target. Intermediate targets are then viewed, and their deviation
from the line of sight is recorded.
The same optical
tooling system is used to measure the alignment relationship between
crosshead guide centerline and cylinder centerline. For this alignment
check, the optical line scope is mounted on the cylinder head, and targets
are centered in each end of the crosshead guide and cylinder liner. The
relationship of the cylinder centerline is compared with the crosshead guide
centerline. Of course, the piston, piston rod, crosshead and connecting rod
are removed for this check. In some cases, the connecting rod may remain in
Through the use of a
special telescope, termed an optical transit square, the perpendicular
relationship between the main bearing saddle centerline and crosshead guide
centerline may be verified. The transit square is really two telescopes in
one, with two focusing scopes built together at precise right angles.
Centering targets are located in the first and last main bearing saddle and
at each end of the crosshead guide. One line of sight is established through
the bearing saddle targets, while the cross scope views the targets located
in the crosshead guide. The deviation recorded on the crosshead guide
targets is a direct measurement of the perpendicular relationship between
the two centerlines
perpendicularity would most likely indicate a machining error or poorly
positioned crankcase and bedsections. A twisted or out of level crankcase
can drastically affect crosshead and cylinder perpendicularity. Therefore,
on cases not yet grouted, this check should be performed after the crankcase
and bedsections are established in a level position