Bryan Machine Service’s recent introduction of a variable, high speed spindles is designed for high speed multi-tasking machines.

Although machine tool multi-tasking typically refers to processes that normally would require multiple machines—such as turning, milling, drilling, taping, boring and finishing a part—it can also delineate variable, high speed spindles that can perform multi-tasked functions within a CNC. The latter is less well known because of its recent introduction into the CNC multi-tasking environment, but is rapidly gaining acceptance as a versatile combined high speed/low speed spindle alternative to the dedicated high speed and low speed traditional tools.

Many high speed CNC machines do not have the torque for low speed work, and machines with lower spindle speeds cannot perform high-speed work. When interfaced with a machine’s existing controls, these VRT variable, high speed, multi-tasked spindles can be used like any other tool in the machine’s tool changer, completely unattended. There is no need to use a separate spindle for each speed to be run. The spindle has a variable speed, i.e. from 15,000 to 40,000 rpm. This enables machines with lower spindle speeds to now also perform high speed work, and high speed machines to perform low-speed work, using the same spindle. The speed is externally adjustable and self-regulating.

Multi-tasking machines loaded with these spindles offer a production potential, as they can often completely machine a part on its own. These variable, high speed spindles reduce part costs because fewer spindles are needed. Labour is reduced because multiple setups requiring additional handling are eliminated. One tool can be applied to a wider range of applications, allowing for minimal inventory and machines themselves, to be held by the manufacturer. The higher degree of versatility enables one spindle to machine a various range of materials. They therefore provide a more cost effective alternative to dedicated high speed and low speed spindle machines.

Originally designed for Haas VMC, Bryan’s VRT spindles operate on a compressed air turbine with an internal regulator that works to maintain the same speed in varying loads. The regulator is operator adjustable from the 15,000 to 40,000 rpm range. When used in a CNC machine with its ACH125c autocupler, it can outperform any tool in the CNC machine’s tool changer for unattended operation.