H

Hammer scars:: See Battle scars.
Hammer tracks:: See Battle scars
Hand tight:: Meaning in terms of threaded fasteners that it can be easily threaded by hand until all available mechanical slack is eliminated and will go no tighter without leverage. Could be termed snug, but not torqued .
Helical gears:: Resistance to the turning of a helical gear tends to thrust the involved shafts in opposing axial directions. This slight axial thrusting can make you mistrust a face mounted indicator or your rim mounted indicator if the surface of a tapered shaft is involved.
Hinge pins:: In this text using the term: hinge pins is simply a way of not over-using the terms: fulcrum or pivot point.
Hold down bolt:: To the lay person, a bolt is a bolt is a bolt, etc. In industry, especially among mechanical crafts persons, the term is usually cap screws . Cap screws and capscrews although spelled differently all mean the same in this text. And when referred to as hold-down bolts, yes that means the same also. But the hold-down bolts are meant to be understood not cheap , or be lesser than the grade five category. These bolts have to restrain motors with awesome power and they have to be of good quality. Considering the service these bolts perform, they must have high tensile strength and shear-resistant qualities.
Hot spot:: In terms of shafts and bearings, the split shell Babbitt type with only a thin oil...

< Previous Excerpt Next Excerpt >

A Millwrights Guide to Motor/Pump Alignment, Second Edition