Several points should be checked prior to laser alignment in order to avoid problems later and to achieve good results.
- Foundation A solid, rigid foundation is essential for a successful alignment.
- Machine Mobility It is advisable to set both machines with about 80 mils of shims underneath the feet in case one machine needs to be lowered. Also, jacking bolts provide a safer and more accurate way to make horizontal moves.
- Rigid Couplings Must be loosened to achieve accurate readings.
- Coupling Play This can be avoided by turning the shafts a few degrees before starting measurements and then taking readings in the same direction.
- Bearing Play Check for excessive bearing play.
- Soft Foot Check for soft foot.
Soft foot can severely affect the operating condition of a machine, which will undoubtedly shorten its life expectancy. Here are a few simple tips to help avoid soft foot in your machines:
- Eliminate rust, dirt and any other contamination from the contact surfaces of the machine feet, shims and frame or foundation.
- Never insert more than four shims at a time beneath a single machine foot. More than three shims may cause a spring effect.
- Eliminate external forces on the machine such as those from connected piping, conduit, auxiliary supports, etc.
- Use high quality, clean and uniform shims when shimming is necessary.
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