What device is commonly used to hold a machine beam down?

The term commonly used to refer to a device that holds a machine beam down is "tie downs." Tie downs are specifically designed to secure objects in place, preventing movement during operation or transport. In the context of machinery, they ensure stability and safety by anchoring the machine beam to a solid base or foundation.

By applying tension, tie downs can absorb vibrations and shocks, which helps maintain the alignment and integrity of the machine function. This is essential in various applications, particularly in construction and industrial settings where movement could lead to hazards or equipment failure.

While anchors, support cables, and stabilizers are also devices related to securing equipment, they each have distinct functions. Anchors typically provide a fixed point for support, which may not directly hold down a beam in the same way that tie downs do. Support cables may offer tension support but do not directly restrain downward motion. Stabilizers are meant to provide additional balance or prevent tipping rather than securing a beam in place vertically. Therefore, in the context of this question, tie downs are indeed the most appropriate choice for holding down a machine beam.