User Manual

G-7
Sag
Deflection due to gravity acting on a cantilevered or otherwise supported
object. Mechanical brackets always sag a certain amount. This sag must be
corrected for if machine moves are to be calculated correctly.
Secondary Alignment
The act of measuring off-line to on-line machine movement.
Shim
A thin piece of metal material inserted between the base and machine feet
to produce precise vertical adjustments of the machine centerline.
Slave
When used as a communications term, it is the unit that is controlled when
data is transferred. In the UltraSpec system, the P/C is the Master and the
UltraSpec analyzer is the Slave.
Soft Foot
A term used to describe any condition where tightening or loosening the
bolt(s) of a single foot distorts the machine frame. Also the name of a
method used to measure this condition.
Spacers
A generic term for any coupling that has two flex planes separated by a con-
necting shaft without bearings or other supports (between the flex points).
Sometimes called an insert or spider.
Spool Piece
Any piece of pipe or shafting which can be removed from a line of piping
or shafting without disturbing or disassembling any other components. The
name spool piece comes from the physical appearance of the piece, often a
short cylinder with flanges on the ends, that resembles a spool of string or
thread.
Squishy Foot
A type of soft foot characterized by material (could be shims, paint, rust,
grease, oil, dirt, etc.) acting like a spring between the underside of the
machine foot and the baseplate contact area.