Head Expanders And Fixtures

Sentek Dynamics provides a wide range of standard head expanders and custom fixtures for vibration testing applications requiring a larger mounting area, vertical mounting or simultaneous testing of multiple devices under test (DUTs) with standard head expander sizes going up to 3000 mm (118.1 inches). The standard material is magnesium with aluminum offered as an affordable option. 

Standard Head Expanders 

• Head plates (square or round) for low-frequency (less than 350 Hz) testing where a large mounting area is needed at an economical cost. (Note: recommended for DUTs with a low center of gravity)

• Head expanders (square or round) for working frequencies ranging from 350 to 2000 Hz.

• Standard and custom insert patterns are available to suit customer fixturing needs

Standard head expanders include stainless steel inserts for enhanced strength and durability.

Head expanders with load support and guidance are designed for performing demanding transportation profiles with large, heavy DUTs to provide additional load support and restraint. Load support and guidance allow DUTs with large footprints to be safely mounted and tested on the shaker, eliminating the risk of damage to the shaker guidance system. 

Custom Fixtures

• Cube

• L - type

• T - type

Custom fixtures can be designed and manufactured to meet unique customer requirements.  Custom cube, L, or T type fixtures are frequently used by customers without a slip table for testing a DUT in all 3 axes.

See table below for standard head expander specifications. For custom head expanders and fixtures, please contact the Sentek Dynamics sales office.

Model number example – HES1000X-1200/###

Where X = M for Magnesium or A for Aluminum and ### = Armature diameter in millimeters