The TV-7 lathe was specifically designed to teach the basics of the turning profession on it. This equipment is a screw-cutting device that was previously manufactured within the walls of the Rostov MAGSO plant. The training workshops of schools and workshops of professional educational institutions were equipped with this equipment. And to this day, such devices can be found in institutions. In addition, the installation can be purchased for your own needs. Moreover, its cost is more than affordable. It will depend on the degree of wear of the equipment and its novelty.
Appointment
The machine described in the article is also called the "Schoolboy". With its help, students master the practical and theoretical foundations of turning business. This model replaced the TV-6, which has undergone minor modernization. The main difference between these machines is the gearbox and the headstock.
This unit allows not only to conduct training, but also to test the skills of existing working specialists who use screw-cutting units in their activities. This equipment is used for:
- end trimming;
- grinding of cylindrical surfaces;
- grooving;
- boring of internal cylindrical surfaces;
- trimming workpieces;
- countersinking;
- drilling;
- conical surface treatment;
- Deployment
- threading.
Key Features
The TV-7 lathe works with metal blanks by the method of their rotation. An additional option is cutting on the machine. For this, pre-heating of the workpiece is not expected. Changing the operating mode is carried out by the method of transferring the belt of the driven and drive shaft.
This process is performed when downshift is engaged. A similar feature provides high functionality and the presence of three additional innings. The TV-7 lathe is also a screw-cutting machine. With it, you can get three options for metric thread.
Machine device
The design has several main components that determine the technical characteristics and operational features. The base unit is the bed, which is necessary to accommodate almost all components of the equipment. It is a cast construction and is based on ductile iron. All nodes of the device are mounted on a bed in special niches.
The TV-7 lathe has a front headstock, which provides fastening and changing the position of the workpieces. There is a reduction box in the system, it is necessary to increase the variation in spindle rotation. Using the gearbox, the rotation of the apron structure is transmitted to the elements.
This allows you to form a thread on the workpiece. A caliper is used to place the tool holder. He performs the role of changing the position of the working incisors. As for the tailstock, it has a standard design. With it, you can mount the workpieces being machined.
Key Specifications
The TV-7 lathe, the characteristics of which you can find in the article, has more outstanding capabilities compared to previous models. It is important to consider the weight of the equipment, which is 400 kg, this reduces vibration during operation. The machine has compact dimensions that are 1050x1200x535 mm.
The maximum diameter of the blank designed for installation above the bed is 220 mm. The blank, which can be installed above the tool holder, has a diameter equal to 100 mm. The step between the center and the bed is 120 mm. The screw-cutting lathe TV-7 has a blank that can be installed in the center, and its length is 330 mm.
The height of the tool holder is 16 mm. In forward rotation, the number of steps is 8. The hole in the main shaft has a diameter of 18 mm. The tool holder can move at a distance of 260 mm or less. With reverse and forward rotation, the speed can vary from 60 to 1000 per minute.
Operational Features
Having read the operating instructions for the equipment described, you can understand that the main task is to observe safety measures when using the device. The equipment must be installed on a solid foundation, before final installation it is necessary to make sure that the floor has a horizontal level. The accuracy of the operation depends on how correctly the device is positioned.
The TV-7 lathe, the technical characteristics of which were mentioned above, must be grounded in accordance with the requirements. Before starting work, it is important to fix the parts well. As a stand, a wooden grill must be used. The operator should use tools that have the correct sharpening.
The part must be fixed in the chuck so that the cams capture the element to its maximum value. Sudden braking should not be a way to make a cartridge. Parts should be installed in the centers, it is important to make sure that the tailstock is fixed. Chips should be removed in a timely manner using a hook.
Features of machine care
The TV-7 metal lathe should be periodically taken care of, this will ensure its long-term and reliable operation. Before switching, the machine must be stopped. If the gear pair has not yet been engaged, then the gear coupling should not be engaged. The cartridge must be turned by hand until it engages. In the event of an incomplete shutdown of the equipment, the switchings should not be made, otherwise it will cause shock and cause breakage of the coupling, gears and rapid wear.
When installing a cartridge, it is imperative to clean the threads. If it is dirty, the cartridge may begin to seize, the result of this will be a spindle breakdown. The device of the TV-7 lathe has been described above. It assumes the presence of caliper seals. You should know that chips accumulate in them over time, which can damage the guides.
There should be no dirty mark on the rails after the caliper. If one has been noticed, it must be washed off, and the guides should be greased with oil. The machine should not be overloaded during operation. If this happens, there will be increased noise. The pin must be extended a small amount, while it will last longer.
Lubrication
Second-hand TV-7 lathe can be purchased today for 25,000 rubles. Any equipment must be lubricated; if these manipulations are carried out in a timely manner, the device will work without fail. To be greased:
- screws;
- gears;
- rubbing parts;
- bearings.
Through the top cover it will be necessary to grease the front headstock. An oil gauge must be used to control the oil level. Grease the drop box through the plug. An oil gauge is also used to control the level in this case. Through the tray, which is located in the upper part, it is necessary to lubricate the gearbox. Given that oil is fed onto rubbing surfaces, the gear hub must be lubricated with grease. On the bed, all mechanisms and guides are lubricated manually before the start of work.
Conclusion
The machine described above has already been discontinued, but such a unit can be purchased today. Its final cost will depend on the technical condition and the safety of the equipment. You should not buy a machine blindly, for a start it is necessary to test it and inspect. Inspection begins with bed guides. It is important to check their wear, which should be minimal. However, on sale you can find the machine with almost no wear, everything will depend on the conditions under which and for how long the equipment was used.