how is motor alignment done with dial give A to Z knowledge & procedure.?

Question

motor alignment is usually done for high speed motors , i want to know how this alignment is done.

Answer 1

adyghe1988 has the right idea - use a dial indicator.

What you must absolutely avoid is keeping the high speed motor shaft from bending. Usually this is done with a motor "shaft coupling" which is specifically designed to avoid the bending forces. The bending forces, if not corrected by alignment, will cause fatigue failure of the shaft - it happens all the time. It will happen very fast on a high speed motor.

If a shaft-coupler is installed, you don't have to use a dial indicator to align the motor shaft to the drive shaft - the shaft-coupler will accept the misalignment . This way you don't have to be so careful installing the motor. Almost all industry uses this method to avoid having to precision align the motor - you should use this method if at all possible.

If you must align the motor shaft to the driven shaft, you'll have to have special tools, and some way to position the motor in 3 axes (pitch, roll, yaw) on a very firm foundation. This makes sense on a massive electrical generator on a cast concrete foundation, but precision alignment doesn't make much sense on small high speed motor if a shaft-coupler can be used.

The special alignment tools needed will have to align the shafts to a high degree of precision - custom made collars that fit over the motor shaft that will allow the dial indicator something to indicate.

I've aligned propellor drive shafts on a boat by aligning the drive shafts in a metal lathe at a machine shop, and then turning the coupling faces in place to achieve perfect alignment and perpendicularity. This is necessary on long drive shafts; less neccessary on shorter shafts.

Below are some reference documents:

V.R. Dodd, Total Alignment, Petroleum Publishing Company, Tulsa, Oklahoma, 1975.

Malcolm G. Murray, Jr., Alignment Manual for Horizontal, Flexibly-Coupled Rotating Machines, Third Edition, Murray & Garig Tool Works, Baytown, Texas, 1983.

Michael Neale, Paul Needham, and Roger Horrell, Couplings and Shaft Alignment, Mechanical Engineering Publications Limited, London, 1991.

John Piotrowski, Shaft Alignment Handbook, Second Edition, Marcel Dekker, 1995.

Erik Oberg, Franklin D. Jones, Holbrook L. Horton, Machinery’s Handbook, Twenty-first Edition, Industrial Press, New York, 1979 (first printing 1914).

Joseph E. Shigley, Charles R. Mischke, Standard Handbook of Machine Design, McGraw-Hill, New York, 1986.

Alignment of Rotating Machinery, Vibration Institute Proceedings, Houston, Texas, 1991.

Falk Alignment Correction System, Operating Manual, The Falk Corporation.

Machinery Alignment Handbook, Vibralign, 1994.

Optical Alignment Manual, Cubic Precision, 1986.

Piranha Shaft Alignment System, Instruction Manual, Mechanical Maintenance Products, Inc., 1995.

Answer 2

Try this site:

http://www.geocities.com/alloyed2sea/Engine_Shaft_Alignment.doc

I hope this is of benefit to you. You may to have save it on a disk or your hard drive, I'm not sure. I, again, hope this what you are seeking. If not I will try again.