The table is placed on the top of the saddle. It holds the jobs and also the job holding devices. A number of T slots are there for holding the workpiece and jigs and fixtures. In CNC milling operation the table is moved by the motor which gets signals from the program codes.
The spindle is the rotating tool holder. The tools are installed in the tapered part of the spindle. The spindle has different RPMs. From the main transmission speed, the spindle speed may vary. The spindle speed is set up according to the properties of the material needed to be machined. Mainly three different types of spindles are seen. These are cartridge spindles, self-contained spindles, and fabricated spindle.
The CNC controller in a CNC milling machine gives signals to the motor of the machine to move in CNC axes. It is the electronic control that works as the brain of the machine. This electrical and electronics equipment executes the code given as the input.
CNC Milling Machine Accessories
The role of coolant in CNC milling machine is vital. It improves tool life and ensures smooth machining of the work. The different coolant used in CNC milling includes Mist Coolant, Flood Coolant, Cool Air Gun or Air Blast coolant and Dust Collector. Actually, the dust collector is not a coolant but it creates the initial condition for the coolant to work. It collects the chips and clears the surface. Mist coolant is used where the machine is not in a closure and requires pressure. For the closed condition of the machine flooding coolant is better.
Like any moving engine or machine CNC milling also needs lubrication. The guideways need lubrication to allow the smooth motion over the table. The leadscrew is needed to be lubricated as it is getting engaged with gears and motors and also handing heavy loads. In a CNC machine, oilers are generally automated. But it can be done manually too. Automated oilers are good as they ensure timely lubrication.
Drawbars are good if you need to change your tool frequently. If automatic tool changer is used then drawbars are required. Capture and release of the tool holders from the spindle can be done by the means of powered drawbars. Drawbars include Impact wrenches, Pull Stud and Tormach TTS Style. With powered drawbars, you don’t need an operator each time when you want to loosen the drawbar. It reduces the time required by half.
Enclosures create a cover for the machine. A milling machine is always cutting and throwing cheaps. It can be very messy. So an enclosure comes in very handy and the chips or the chips mixed with coolant keeps inside and the production floor remains clean.
As the name implies it gives another movement in a direction different from the direction of X, Y and Z. It is required in many cases. With this, the operator can hold extra parts on the table and can do some extra work on the workpiece.