Working stroke of the mill, the maximum possible depth of milling, is one of the most important parameters demonstrating the functionality of the tool. For lightweight domestic milling machines, this indicator, as a rule, lies in the range of 20-50 mm, for powerful professional models it can reach 70-80 mm. The more the working stroke of the cutter, the deeper it can immerse in the material being processed, the thicker the parts can be processed.
A groove of full depth is usually not cut at a time – you can spoil the workpiece and damage the tool. At the same time, the harder the material being processed, the less the depth of a single pass is made. But in general, a groove with a depth greater than the working stroke of the milling cutter can not be made. Many models of mills are equipped with a fine adjustment of the depth of immersion, the accuracy of setting this parameter, they usually amount to 0.1 mm.
Constant electronics. When the density of the material being processed or the speed of the tool is increased along the workpiece, the revolutions begin to fall. Support them at a given level will help the system of constant electronics, controlling the power of the electric motor in order to stabilize the speed of rotation of the spindle. The need for this function usually arises with large loads on the tool, so it usually occurs only in professional mills.
Contact electronics allows maintaining a consistently high quality of material processing.
Smooth start. Powerful professional milling machines are often equipped with a “soft start” system. Due to this function, the engine is gaining momentum gradually, which eliminates the sharp jerk of the rig when it is turned on. Such a tool will last you longer, since its nodes do not experience periodic short-term overloads, they work safer, and the chance to spoil the workpiece at the very beginning of work is minimized.
Overload protection system. If the temperature of the motor winding exceeds the critical level, the overload protection system will come into play. With different models, this function can be implemented in different ways – from simple light indication to automatic power off.
You can find a milling machine with an overload protection system only among professional models, as they are used for prolonged intensive work, which means that they are more likely to start overheating as a result of increased loads.
Protection against unintentional starting. On the case of most modern mills, regardless of their price category, there is an additional button, without pressing it simultaneously with the main start button, the voltage to the motor windings will not be applied.
Its main purpose is to prevent unintentional starting of the wood router. This button performs, as a rule, and one more function – it allows to block the trigger trigger in the on position. When stationary use of the router (milling table) without such an option is indispensable.
Design features that must be considered when selecting a router
The support platform of the router, which is called the sole, is one of the most important structural elements of the tool, so its quality should be paid special attention. The sole can be made of either cast or stamped metal. The cast platform, thanks to its clear geometry and good fit to the surface of the workpiece, guarantees a high quality of work. Not surprisingly, it is considered a sign of a high class instrument.
Stamped sole is cheaper in production, so it is usually installed on inexpensive domestic milling cutters.
The lower plane of the platform, i.e., directly the sole itself, is necessarily closed with a special lining. This element is made, as a rule, from plastic. In most mills, the plastic pad is removable, which makes it easy to replace it when worn for a new one.
When choosing a router, you should pay attention not only to the quality of the sole, but also to the size of the hole in it – the opening. It limits the maximum permissible size of the tooling: you will simply not be able to install a large diameter milling cutter on an assembly with a small opening in the support platform.
The head of the router moves along two vertically positioned guide rods. On how easy and smooth it will be, largely depends on the ease of use of the tool and the productivity of the work. The presence of backlashes and distortions, as well as excessive resistance to moving the unit in the vertical direction is considered a serious drawback, since it makes it difficult to use the router.
The depth of immersion of the milling cutter in the material being processed is limited by a vertical stop. This metal rod rests against a special platform on the platform, not allowing the head of the tool to fall lower. When setting the depth of milling, you simply move the thrust rod up or down. You can do it with a special screw.
In advanced units, in addition, there is also an adjustment screw for fine-tuning the depth with a micrometer scale. The more precise the adjustment and the wider its range, the more qualitative and functional the tool you hold in your hands.
Make several passes with a gradual increase in the depth of processing right up to the given will help the multi-stage turret stop. In fact, this is a special platform on a platform with several steps of different heights, into which a vertical rod restraining the depth of milling rests. Sometimes the turret is made in the form of several bolts screwed into the platform; in this case, the height of the steps can be adjusted by screwing or unscrewing the bolts.
Fixing attachment assembly
The tool of the hand router is fixed to the spindle with the help of a collet chuck. It is a special nut with a collet located inside, screwed onto the spindle and clamping shank of the inserted cutter. Lightweight milling cutters are designed for mills with a shank diameter of 6-8 mm, powerful, as a rule, equipped with collets of 10-12 mm in diameter. The latter is easily explained: the larger the cutter, the thicker its shank and, at the same time, the higher the requirements for the tool’s power characteristics.