Ney manufactures is used to shape crowns and bridges in dental laboratories. During the design stage, they were looking to bond the turbine assembly, a subassembly of the handpiece which consist of a stainless steel shaft, bearings, turbine, and other parts, when air hits it, makes the shaft spin. These parts are made of stainless steel, brass, or aluminum and are slid onto the shaft.
Because it is a high-speed, low-torque, air-driven handpiece, spinning at 300,000 rpm, Ney design engineers required high bond strength and reliability. Ease of assembly was another requirement, as Ney manufactures hundreds of these each month.
Loctite Retaining Compounds fit the bill. Loctite® RC ™ 609 is a low viscosity, rapid-curing liquid. It augments the strength of press-fit assemblies and can be used on slip fits up to "005" diametrical clearance. RC 609 fixtures in 10 minutes on unprimed steel at room temperature, providing a shear strength of 3000 psi at full cure.
Manual application of RC 609 is made easy with Loctite's 10 ml bottles and small gauge dispensing needles.
Ney Dental relies on Loctite 609 to bond the turbine assembly of its new handpiece. In fact, Loctite® RC ™ 609 Retaining Compound is now used on all their slip fit assemblies with gaps of .002" to .003" to provide a strong bond.
Loctite RC 609 provides a strong bond in the turbine assembly and is now used on their slip-fit assemblies with gaps of "002" to "003". Even when used 8 hours a day, the average life of this handpiece is one to three years. Andy Dybicz, Manager of Quality Assurance claims that parts are easily repaired. “Usually the bearings wear out first, with the Loctite adhesive still holding. So we replace the bearings, apply Loctite RC 609, and the handpiece is as good as new.”