4IM13 Chapter 13 Alignment

The shim stock thickness required to correct the angular misalignment in the vertical plane of a pump and motor assembly having a 3" D coupling, a vertical angular gap of 0.033", and an MTBS mounting hole distance of 4" is _____".

0.044

The adjustment required to correct the angular misalignment in the horizontal plane of a pump and motor assembly having a 3" D coupling, a horizontal angular gap of 0.087", and an MTBS mounting hole distance of 4" is _____".

0.117

A base plate that is drilled and tapped to anchor a machine must be a minimum thickness of _____ times the root diameter of the anchoring bolts.

1 1/2

The accuracy of straightedge alignment generally is no better than _____".

1/64

The top position, when using a dial indicator, is known as the _____ position.

12:00

When using the combination rim-and-face alignment method, angular misalignment in the vertical plane is checked by measuring the face of the coupling at the _____ positions.

12:00 and 6:00

When using the combination rim-and-face alignment method, angular misalignment in the horizontal plane is checked by measuring the face of the coupling at the _____ positions.

3:00 and 9:00

_____ is the location (within tolerance) of one axis of a coupled machine shaft relative to that of another.

Alignment

_____ is any means of fastening a mechanism securely to a base or foundation.

Anchoring

_____ misalignment is a condition where one shaft is at an angle to the other shaft.

Angular

_____ soft foot exists when one machine foot is bent and not on the same plane as the other feet.

Angular

_____ is the process of pressing the start switch of a machine to determine if the machine starts when it is not supposed to start.

Challenging

_____ is a condition that exists when the bolt hole of a machine is so large that the bolt head forces the washer into the hole opening on an angle.

Dowel effect

A spacer is steel material used for filling spaces 1/4" or less.

False

Dowel effect is corrected by using machined washers 2 to 5 times thicker than the original washer.

False

When using a dial indicator, readings have to begin at zero.

False

A(n) _____ screw is a screw inserted through a block that is attached to a machine base plate allowing for ease in machine movement.

Jack

_____ is the condition where the centerlines of two machine shafts are not aligned within tolerances.

Misalignment

_____ misalignment is a condition where two shafts are parallel but are not on the same axis.

Offset

_____ soft foot exists when one or two machine feet are higher than the others and parallel to the base plate.

Parallel

_____ foot is a condition that occurs when one or more feet of a machine do not make complete contact with its base.

Soft

_____ soft foot is a condition that occurs when a dial indicator at the shaft shows soft foot, but feeler gauges show no gaps.

Springing

_____ expansion is the dimensional change in a substance due to a change in temperature.

Thermal

Always choose the combination that uses the least amount of shims or spacers when different shim or spacer combinations can be chosen.

True

Jack screws are used for machine movement only.

True

Precut stainless steel shims are recommended for alignment purposes.

True

Runout is a radial variation from a true circle.

True

The laser rim-and-face alignment method is used when extreme accuracy and fast alignment are required.

True

The objective of proper alignment is to align the shafts, not the couplings.

True

The two methods of measuring soft foot are the at-each-foot method and the shaft deflection method.

True

A(n) _____ plate is a rigid steel support for firmly coupling and aligning two or more rotating devices.

base

A(n) _____ is a device that connects the ends of rotating shafts.

coupling

A(n) _____ is a device that measures the deviation from a true circular path.

dial indicator

Axial _____ is the axial movement of a shaft due to bearing and bearing housing clearances.

float

Good shim packs are _____ cut with each size printed on the shim.

laser

The _____ method is the most widely used, most widely misused, and most troublesome of the precision alignment methods.

rim-and-face

When aligning machinery, MTBS is an abbreviation for machine to be _____

shimmed

When aligning machinery, SM is an abbreviation for _____ machine.

stationary

A(n) _____ gauge is a flat, tapered strip of metal with graduations in thousandths of an inch or millimeters marked along its length.

taper

Feeler gauges can determine the air gap between two solids to accuracy within _____ of an inch.

thousandths