runout means the radial play of the rotor or shaft.
it must be in between 0.02 to 0.03 for large turbine rotors.
First of all u have to conform how many areas u want to
take run out. On that basis u put the dial guages on that
flanges or bearing journals.
setting of dial guage is in such a way that it must be sit
on the parting plane and the dial point must be touch that
corresponding flange or bearing journal.
press the dial upto 5mm pressure. and set the dial into
zero and that is the reference point i.e. zero point
rotate the rotor and take the readings for every 90 degrees
At zero degree what is the reading, not down
at 90 degree reading, 180 deg reading, 270 deg reading and
finally again 0 degree reading.
Out of these check where is the max reading u observed.
Whether the max reading is within the limit or not u check
This total process i am telling is regarding turbine rotor
But whatever it may be the process is same but the limits
Runout is a composite control which control form,
orientation and location. Runout is often used to control
coaxiality of diameters.
The conditions for Runout are
-> Datum reference is a must.
-> Geometric tolerance must be specified at RFS.
-> It must be applied to Cylinderical Feature Of Size(FOS).
Runout is also a metal casting defect. It is defined as a
leakage of molten metal from a cracked or broken shell, which
results in finning and/or loss of metal. The resulting
casting may contain non fill, short pour and/or shrink defects.
i am B.E mechanical enginner and i am appearing exam OF
mahagenco for the post junior engineer.can get previous
exam paper for mahagenco for B.E mechanical engineer .I
ALSO WANT STUDY MATERIAL FOR EXAM.
If one cylinder of a diesel engine receives more fuel than
the others, then for that cylinder the: a) exhaust will be
smoky b) piston rings would stick into piston grooves c)
exhaust temperature will be high d) engine starts
overheating e) all of the above.