How is horizontal alignment typically corrected in machinery installation?

Horizontal alignment in machinery installation is primarily achieved by adjusting the position of the unit on its base, often using jacking screws. This method allows for precise control over the horizontal positioning of the machine, ensuring that it meets the required alignment specifications. By using jacking screws, millwrights can raise or lower specific corners of the machine, thus effectively correcting any misalignment and enabling the machinery to operate smoothly without unnecessary wear or vibration.

While adjustments to supporting brackets and couplings are important in the overall alignment process, they do not directly address horizontal positioning as precisely as adjustments made on the unit's base. Repositioning brackets may help in certain setups, but it typically does not offer the same level of fine-tuning needed for achieving proper horizontal alignment. Similarly, realigning couplings may enhance the connection between parts but is not a method used to correct the initial horizontal placement of the machinery itself.