Every now and then I learn something new about Allis-Chalmers. One of those new tidbits I have recently discovered is the betatron lab the company had at the West Allis Works. Last year I had the opportunity to step inside this old testing lab and see some of the equipment left behind. The machine was essentially a giant X-ray used to inspect for imperfections in the large components made in the foundry. This was housed in a small concrete lab on the factory grounds.
A site was chosen on a bluff on the northeast side of the complex where the foundry dumped waste sand. It was close enough for equipment to be hauled in by rail and truck but also far enough away to avoid interference from ground vibrations caused by factory presses and hammers. The building was finished and operational in September of 1952 and cost $342,000. The company said that the cost of the betatron lab was recouped in less than a year from savings earned from inspecting equipment for quality and precision.
The walls of the “L” shaped x-ray bay were constructed with steel reinforced concrete walls that were 6 feet thick and 20 feet high. Approximately 1000 cubic yards of concrete were used. The bay had a 25-ton bridge crane that moved components into position and then reloaded them on trailers or rail cars. The 22 million volt betatron hung suspended from a 7.5-ton bridge crane that allowed the unit to be moved around the entire work space. It could raised 20 feet above the floor, rotated 360 degrees around and tilted 170 degrees. In addition to the testing bay, the building had several other rooms for the testing processes. The control room housed the equipment that operated the giant x-ray behind the thick concrete walls. There was also a darkroom and viewing room that processed the film. Other areas included the electrical equipment room, storage, offices and wash rooms.
Safety was one of the major components that went into designing and building the lab. The thick concrete structure shielded workers inside and out from the radiation exposure. Safety switches and warning devices were put in place to protect technicians from accidental exposure. After testing was completed, workers tested the lab with radiation meters to ensure no radiation escaped from the bay.
Allis-Chalmers made other betatron units for medical use in cancer treatment. Just another fine example of the sophisticated products the great Milwaukee manufacturer had a hand in.