Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

Inboard and Outboard are Planes – Not Feet

Industry Topics
Image of Inbound and outbound planes

Inboard and Outboard are Planes – Not Feet

In alignment, the feet of the moveable machine are often referred to in this manner:

  • those closest to the coupling are called inboard, coupling side, shaft side, or drive end.
  • those farthest from the coupling are referred to as outboard, opposite coupling side, opposite shaft side, or opposite drive end.

I learned them as inboard and outboard.  But regardless of what you call them, it is important to note that “inboard” or “outboard” are planes, not feet.

Once soft foot has been checked and corrected, and the initial alignment values have been measured, the inboard two feet will be changed up or down by the same amount of shims, as will the outboard two feet.

In this example, the inboard plane is 12 mils too low, which means we will add 12 mils.  The outboard plane is 20 mils too high, which means we must remove 20 mils.  Whatever we do to one inboard foot, we must do to the other.  The same is true of the outboard feet.  We must shim in planes, not feet.

Think of it this way – when we make a horizontal correction, we can not move the left inboard foot horizontally more or less than we can move the right inboard foot, they must go together.  The same is true of the vertical correction.

For more information, visit VibrAlign.com

Related Articles

Related Whitepapers

Contra-Rotating Axial Fan Design Concept for Leaf Blowers

It seems leaf blowers are everywhere in our neighborhoods, very often disturbingly noisy. There is a need for excellent aerodynamic and aeroacoustics design for such…

Split Seal + SpiralTrac® Solution Reduces Maintenance and Water Use

A wastewater treatment facility has 10 RAS (Return Activated Sludge) solids handling pumps. These pumps have been sealed using packing and replacement sleeves for several…

Protecting VFD-Driven Motors In: Meat and Poultry

The Study This field survey was conducted at Hormel Foods, Freemont, Nebraska. Voltage readings were taken from the shafts of VFD-driven motors throughout the plant…

VFDs Provide Precise Control Required to Ensure Dairy Product Quality

Milk is the basic ingredient in the production of a long list of dairy products and by-products ranging from whole pasteurized milk to cheese, to…

Comments

Leave a Reply

Your email address will not be published. Required fields are marked *