A Tube Mill is a machine used in the manufacturing of both pipe and tube products, including but not limited to pipes, electrical conduit, water pipes and plastic tubing. Tube milling machines can be operated manually or electronically, and they can be used for simple operations like pulling or pushing. Alternatively, they may be designed to perform complex operations using a variety of machinery control systems. The most common types of Tube Mills are the following:
This type of milling machine is suitable for making hollow tubes and for grinding solid objects. It consists of a table top that is supported by a vertical shaft and a number of ball bearings at the end of which there are two cutting heads. These heads rotate on a vertical axis and grinding the balls into smooth profiles requires an arbor and cutting plate. Due to their construction, these balls tend to leave dust particles behind them, and this dust is also a potential fire hazard when the machinery is in operation. To minimise the possible health risks associated with the use of this machine, it is important that operators use approved personal protective equipment, such as face masks, goggles, and respirators.
Another variation of tube mills is the fastener-driven milling machine. This type comprises a fixed table top with a number of cutting heads positioned above it and which rotate around a vertical axis. These machines are ideal for precision surface grinding or for abrasive grinding (for example, grinding stone, granite, limestone). They are also suitable for drilling (through a hole drilled into a solid object), suction forming (for metal) and for stamping. Although they are similar to the fastener-driven types, Prof. Fischer’s models have been found to be superior for abrasive applications; however, the quality of the finished product does tend to be a little lower than that of other types of grinders.
An advantage of the electrical version of this machine is that it can be used to speed up the process of welding, thus reducing down the total consumption of electrical energy during the welding process. However, the electrical versions of the tube mills are also found to be less efficient compared to those using the pre-ground electrodes; the efficiency of these types of machines is determined by the ratio of input power to output power, which is known as the pulse width. As well as being found to be significantly more efficient than the other variants, the electrical milling machines also have a tendency to produce much higher pulse rates, which means that they can work more quickly.
The third variant of this type of milling machine is the electro-statically actuated milling machine. These machines are operated through the application of an electric current and they employ the use of a hand wheel to cause impulses to the electrodes on the workpiece. The frequency of these impulses emitted is controlled by the position and angle of the hand wheel and the distance from the work surface to the contact point. These types of welding operations have a number of advantages over the electrical versions; the first being that the power supply for these operations can be either direct or alternating current (DC). The second advantage is that the consumables used in the operation of these types of welding operations are typically stainless steel or other metal-free materials.
When it comes to the third variant, the Electro-Statically Actuated Mill, we find that this type of machine operates by using a trolley attached to the work piece that has a hand crank attached to it. The trolley activates the hand crank, which causes a rotation motion to the workpiece while preventing it from touching any of the conductors attached to the work piece; this is done via a control mechanism that is fitted onto the trolley. The control mechanism then causes a pulsating motion to the electrodes attached to the work piece; the movement of the trolley is controlled by the user, which is then transmitted to the control panel of the welding machine. This type of welding operation has been found to be more efficient than the other variants due to the fact that there is no requirement for the use of a trolley; therefore this system can be used to conduct both trolley and arc welding operations. There is also the potentiality for the Electro-Statically Actuated Mill to be operated in an automatic mode.