Head Expanders

Unholtz-Dickie offers a wide range of head expanders and head plates to maximize the versatility of any electrodynamic shaker. The head expanders are manufactured from light-weight magnesium alloys, providing high strength-to-weight ratio.

By increasing the mounting area of the shaker, multiple items can be tested at the same time, decreasing total test cycle time. In addition, with Guided Head Expanders, payloads with large foot prints can be safely mounted and tested on the shaker, minimizing the risk of damage to the shaker suspension system. Although many head expanders are resonant below 1000 Hz, average or extremal control allows operation to 2000 Hz.

Model HE12-2424-8 Table Expander on a UD S452 Shaker

Standard Head Expanders

The light-weight magnesium, cast head expanders provide reliable and effective solutions for any large, broadband package testing needs.

(Displayed is model HE12-2424-8 Table Expander on a UD S452 shaker, expanding from a 12" diameter armature table to a 24" x 24" surface.)

Round, square, and octagon available
Usable to 2,000 Hz
Adapts easily for use with thermal chambers
Increases shaker productivity
High resonant frequencies available, depending on size
Cost effective
Various insert mounting hole patterns available

Model TEG30-16: 30 in. diameter round head expander

Guided Head Expanders

To test large, heavy packages, the Guided Head Expanders provide additional restraints and load support to handle tough transportation and other challenging test profiles.

(Displayed is model TEG30-16: 30" diameter round head expander with linear guidance bearings and air bags (shown on an R16 shaker). This particular model can accommodate an additional 48" x 48" head plate on top, making it a highly versatile unit.)

Four rigid linear bearings or shear mounts provide guidance for tall or offset loads.
Airmounts located under the head expander automatically center large payloads when connected to the existing Auto-Centering system. Load support available for up to 10,000 lbs (4,540 kg).
Allows testing of large payloads while maintaining reliability of shaker armature suspension.
Can be easily removed to allow shaker rotation for use with a slip table assembly.
Special support structures for various shaker bases available to accommodate additional suspension restraints.

Head Plates

For low frequency testing, Head Plates provide a large mounting surface at an economical price and is recommended for multiple test items with low center-of-gravity.

Used to increase table area for low frequency testing
Will adapt insert patterns of existing fixturing
Most economical means of increasing shaker table area

Standard Magnesium Cast Head Expanders
Model	Expander Size	Armature Size	Weight	Resonant Freq.
	inches (mm)	inches (mm) dia.	lbs (kg)	Hz
HE12-2424-8	24 x 24 x 8 (610 x 610 x 203)	12 (305)	110 (50)	1400
HE16-2424-6.5	24 x 24 x 6.5 (610 x 610 x 165)	16 (406)	100 (45)	1500
HE-16-3232-10	32 x 32x 10 (813 x 813 x 254)	16 (406)	252 (114)	1050
HE16-3636-10	36 x 36 x 10 (914 x 914 x 254)	16 (406)	282 (128)	900
HE16-4040-12	40 x 40 x 12 (1016 x 1016 x 305)	16 (406)	410 (186)	720
HE16-4444-12	44 x 44 x 12 (1118 x 1118 x 305)	16 (406)	440 (200)	625
HE16-4848-12	48 x 48 x 12 (1219 x 1219 x 305)	16 (406)	490 (220)	530
HE24-3232-7	32 x 32 x 7 (813 x 813 x 178)	24 (610)	214 (97)	900
HE24-3636-7	36 x 36 x 7 (914 x 914 x 178)	24 (610)	241 (109)	740
HE24-4040-9.5	40 x 40 x 9.5 (1016 x 1016 x 241)	24 (610)	360 (164)	650
HE24-4444-9.5	44 x 44 x 9.5 (1118 x 1118 x 241)	24 (610)	405 (184)	550
HE24-4848-9.5	48 x 48 x 9.5 (1219 x 1219 x 241)	24 (610)	452 (205)	480

Guided Head Expanders
Model	Expander Size	Armature Size
	inches (mm)	inches (mm) dia.
TEG24-12	25.5 (648) dia.	12 (305)
TEG30-12	31.5 (800) dia.	12 (305)
TEG30-16	31.5 (800) dia.	16 (406)
TEG2424-12	24 x 24 (610 x 610)	12 (305)
TEG7236-16	72 x 36 (1828 x 914)	16 (406)
TEG6060-24	60 x 60 (1524 x 1524)	24 (610)
TEG7272-16	72 x 72 (1828 x 1828)	16 (406)

Head Expander Photo 1

Model TEG6060-24, shown on the T4000 shaker, supports up to 12,000 lbs (5,450 kg) of payload and utilizes (4) linear bearings located at widely spaced corner positions to optimize in-axis guidance and provide effective lateral restraint. This robust mechanical design features an outboard "Super Structure" that uses the massive shaker body to anchor the head expander's guidance system. It is an ideal system for large military hardware testing, low frequency transportation simulation and large geometry space hardware testing.

Head Expander Photo 2

Model TEG7272-16, with an R16W shaker, provides a huge 72" x 72" surface for large payloads, such as entire instrument panels in Squeak and Rattle applications.

Head Expander Photo 3

Model TEG7236-16, shown on the T2000 Slip Table base, can be used to test very large parts in the automotive field. This particular head expander can be easily lifted to allow the shaker to operate in the horizontal direction.