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Abssac recently supplied leadscrew and nut assemblies for use within a high-vacuum diagnostic tool for particle accelerators.

The leadscrew assembly was used to displace two disk-like structures that captivated a precision aperture, which in turn shaped a supersonic gas jet passing through them.

Changing the distance between the disks enabled the tailoring of the shape of the gas jet for diagnosis purposes.

Criteria for the application included finite repeatable linear accuracy, reliability and the ability to continuously work in a vacuum environment of 10-6mbar.

The high-vacuum environment also meant that any outgassing of the plastic materials employed for the nut could pose a problem to final diagnostics.

After some consultation with various material suppliers, the material chosen for the nut was Toray Torelina PPS resin with GFRP.

Torelina resin, a high-performance plastic, provided excellent heat resistance, flame retardancy, chemical resistance and physical strength.

Abssac was also able to supply the 2mm-pitch flanged nut already degassed and certified using a gas chromatograph mass spectrometer (GCMS), which recorded the emitted compounds by mass number on a certified calibrated graph.

After a two-hour treatment and subsequent GCMS analysis, the nuts were ready to be fitted to the 6mm-diameter stainless steel screw and shipped in a sealed atmosphere packaging.

In a nut shell…. For well over 25 years, we have been a company that provides engineering support to all of the products we supply, teamed up with exceptional customer service. Our professional and honest approach to business is often commented on as one of our key advantages. Situated in the Vale of Evesham, Abssac supplies rotary and linear power transmission products.

Through a dedicated and knowledgeable sales team, our product portfolio incorporates all types of flexible shaft couplings such as helical beam, cross-slot, metal bellows, elastomeric, metal disc, gear and solid designs. Our extensive precision linear products include lead and ball screws in rolled, whirled, machined and ground formats, which are complimented by a large range of anti-backlash nut designs. Finally and perhaps where we excel the most, our specialist product ranges which include the unique machined spring product and precision electro-deposited forms. In many cases, our ability to quickly adapt a standard program part into a key component has enhanced product designs around the world.

Established in 1982, we are a Quality Assurance BS EN ISO9001: 2000 approved company.

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