This equipment was developed by the Odessa Design Bureau; production was launched at several enterprises of the former USSR in the middle of the last century. Based on the main model, a number of modifications NS-12A, NS-12B, NS-12M were created, with minor differences in characteristics and configuration. The NS-12 drilling machine performs hole drilling and thread processing in parts made of steel, cast iron, non-ferrous metals and alloys, and non-metallic materials. It belongs to the group of tabletop machines.
Description of the unit
It has small dimensions and is installed on a workbench, allowing for the processing of small parts. It is used to equip repair production departments, educational and home workshops.
Despite its small dimensions and low performance, it is lightweight and easy to use. The simplicity of the design makes maintenance and repair accessible.
Design of drilling machine NS-12
The machine is easy to operate, and its simple design increases reliability and durability.
The NS-12 machine has five operating spindle rotation speeds. The rotation speed is changed using a belt drive. The belt is quickly rearranged on multi-stage pulleys from one diameter to another. Thanks to the original design of the tension mechanism, craftsmen can easily obtain the desired cutting speed.
The technical characteristics of the NS-12A drilling machine make it possible to perform the following operations:
- drill and ream holes;
- countersinking and countersinking;
- unfold holes;
- cut the internal thread.
The main cutting movement is the rotation of the tool and the vertical feed of the spindle.
The largest drilling diameter in a steel part, the largest spindle stroke and overhang are the basic parameters of the machine. A description of the equipment is also easy to find on the Internet or from experienced professionals. Any equipment of this type has its own passport, which contains all the technical and specific instructions.
Machine passport
Design of the NS-12A machine
The main design elements of a tabletop drilling machine are:
- base;
- Column;
- trunk with spindle group;
- electric drive;
- controls.
The cast iron base serves as a support base, and inside the massive plate there are electric drive elements, including a switch housing that provides lighting for the work area and a step-down transformer.
A push-button station for turning on the equipment is located on the front panel of the base. At the top of the base there is a work table for installation and securing fixtures and parts.
Along the perimeter contour there is a trench for accumulating coolant used during processing. The gutter has a drain hole closed with a screw plug. In the case of supply from the central line, a nipple with a rubber hose is connected to the hole.
The column is fixed to the base plate with a special shoe and tightened with bolts. When it is necessary to rotate the column around its axis, the bolts are released, the stand together with the upper part is installed in the required position and fixed.
The trunk consists of a cast iron body in which a spindle assembly, a movement mechanism, a belt tensioner and a local lighting lamp are mounted.
An electric motor is suspended from the rear of the body on a sub-motor plate.
It will be able to move longitudinally along the guides. Motor mobility is necessary to reduce the tension of the drive belt when adjusting the spindle speed. When the belt is placed in the pulley groove, the motor returns to its place and the required tension is ensured.
The raising and lowering of the trunk along the column is ensured by a rack and pinion transmission. The transmission rack is firmly fixed to the column, and the drive gear is located in the trunk. Vertical movement is controlled manually through a handle that has a rigid connection with the gear. The second lever is located near the column and fixes the position on the column; this occurs at the required height above the table.
The spindle is installed on the cantilever part of the trunk in the machine quill, movable in the vertical direction.
The movement of the quill, which transmits the feed movement to the spindle, is carried out by a handle located on the side of the trunk. The spindle of the NS-12A drilling machine is placed in supports with precision angular contact bearings; they ensure precision movement and smooth running. The control pulley is made in the form of a five-stage design and is mounted in supports with radial bearings.
You can control the drilling depth of blind holes using a special hard stop and a flat scale on the body.
Machine control principle
Before putting the machine into operation, you need to make sure that grounding is present.
Operating the machine is quite simple:
- to turn it on, you must press the “Start” button on the push-button starter panel;
- switching on is accompanied by the start of the electric motor;
- the machine is ready for work, and to stop work, press the “Stop” button. The power will turn off and the engine will stop. If necessary, local lighting is turned on by turning the toggle switch of the package switch.
Unit control
List of control elements for the NS-12A drilling machine:
- "Start" power button;
- “Stop” shutdown button;
- light switch;
- lever for vertical movement of the trunk along the column;
- tension device clamps;
- quill movement control handle for manual feeding;
- handle for fixing the position of the trunk.
Trunk position fixing handle
Local lighting
The machine is equipped with the necessary equipment for connecting local lighting. The installation location is selected depending on the installation location.
Most often, craftsmen choose a workbench or a monolithic table as a place to install the NS-12A drilling machine. Then the mounting bracket with the local lighting transformer is installed near the machine on the same base. When placing equipment near a wall, it is convenient to place the mount on it.
The presented drilling machine model is considered reliable equipment with a clear control algorithm. The model is highly maintainable and does not require large maintenance costs.
A popular and budget model will be an ideal assistant in the following rooms:
- auto repair shop;
- mini-workshop;
- educational laboratory of the technical school.
Video: Drilling machine NS-12A
Information about the manufacturer of the tabletop drilling machine SNVSH
Tabletop drilling machine SNVSH-1, SNVSH-2 is produced by the company Rostov plant of small-sized machine tools MAGSO, founded in 1956.
Other manufacturers of the SNVSH-1 machine: Novocherkassk Electromechanical Plant NEMZ, Kasimovsky Mechanical Plant No. 8, By Set Leningrad.
SNVSH tabletop drilling machine. Purpose and scope
In 1985, the SNVSh-1 machine replaced in production the NS-Sh model table-top drilling machine, which had been produced since 1978.
The machine is designed for drilling holes and cutting threads in small parts made of cast iron, steel, non-ferrous alloys and non-metallic materials in industrial enterprises, repair shops and household workshops.
The simplicity of the design ensures ease of control, reliability and durability of the machines.
Main parameters of the SNVSh drilling machine:
- Maximum drilling diameter: Ø12 mm
- Maximum drilling depth: 100 mm
- Distance of spindle axis to column (overhang): 160 mm
- Electric motor power: 0.6 kW
- Machine weight: 85 kg
Spindle The VSN machine receives 3 rotation speeds from three-stage drive pulleys, which provides a choice of cutting speeds - 450, 1200, 1800 rpm.
Spindle end- external Morse cone KM2, designation B18 according to GOST 9953 (Shortened tool cones) - shortened cone: D = 17.780 mm, cone length 37.0 mm.
The shortened cone B18 corresponds to a three-jaw drill chuck of the 16th standard size in accordance with GOST 8522 (Three-jaw drill chucks) with a clamping range from 3 to 16 mm.
An example of a symbol for a 3-jaw drill chuck, size 16, with a connecting conical hole B18:
Cartridge 16-B18 GOST 8522-79
Morse cone instrumental shortened
Tool taper - Morse taper is one of the most widely used tool mounts. It was proposed by Stephen A. Morse around 1864.
Morse taper is divided into eight sizes- from KM0 to KM7 (in English: MT0-MT7, in German: MK0-MK7).
Morse taper standards: GOST 25557 (Tool cones. Main dimensions), ISO 296, DIN 228. Cones made according to inch and metric standards are interchangeable in everything except the shank thread.
For many applications, the length of the Morse cone turned out to be excessive. Therefore, a standard was introduced for nine standard sizes of shortened Morse cones (B7, B10, B12, B16, B18, B22, B24, B32, B45), these dimensions were obtained by removing the thicker part of the cone. The number in the designation of a short cone is the diameter of the thick part of the cone in mm.
Russian standard for shortened cones GOST 9953 Tool cones are shortened.
Russian standard for drill chucks GOST 8522 Three-jaw drill chucks.
- B7- Morse cone KM0, D = 7.067 mm;
- B10- Morse cone KM1, D = 10.094 mm. Cartridge 4-B10(0.5÷4 mm);
- B12- Morse cone KM1, D = 12.065 mm. Cartridge 6-B12(0.5÷6 mm), Chuck 8-B12(1÷8 mm);
- B16- Morse cone KM2, D = 15.733 mm. Cartridge 10-B16(1÷10 mm), Chuck 13-B16(1÷13 mm);
- B18- Morse cone KM2, D = 17.780 mm. Cartridge 16-B18(3÷16 mm);
- B22- Morse cone KM3, D = 21.793 mm. Cartridge 20-B22(5÷20 mm);
- B24- Morse cone KM3, D = 23.825 mm;
- B32- Morse cone KM4, D = 31.267 mm;
- B45- Morse cone KM5, D = 44.399 mm.
Where D- diameter of the cone in the main plane.
The drilling depth is measured using a flat scale or stop.
The original design of the belt drive tension allows you to quickly change the position of the belt on the pulleys to obtain the desired cutting speed.
Using a stand to install the machine makes it possible to drill the ends of long parts, such as shafts. The diameter of the shaft is up to one hundred and twenty millimeters, the length is up to a thousand millimeters.
The SNVSh drilling machine allows you to perform the following operations:
- drilling
- countersinking
- deployment
- reaming
- thread cutting
The SNVSh drilling machine can be equipped with additional accessories to expand its capabilities:
- Vise- indispensable for complex types of processing, for example, small parts or drilling at an angle
- Cross table- indispensable for precise coordinate drilling or light milling
- Turret
- Cooling unit- indispensable for long-term drilling
General view of the SNVSh tabletop drilling machine
Photo of the SNVSh drilling machine Kasimovsky Mechanical Plant No. 8
Tabletop drilling machine SNVSh. Video.
Technical characteristics of the SNVSh machine
| Parameter name | 2m112 | SNVSH |
|---|---|---|
| Basic machine parameters | ||
| Largest drilling diameter, mm | 12 | 12 |
| The smallest and largest distance from the end of the spindle to the table | 0...400 | 20..420 |
| Distance from the axis of the vertical spindle to the rack guides (overhang), mm | 190 | 160 |
| Desktop | ||
| Width of the working surface of the table, mm | 250 | 250 x 250 |
| Number of T-slots | 3 | 3 |
| Spindle | ||
| Maximum movement of the spindle head, mm | ||
| Spindle sleeve stroke, mm | 100 | 100 |
| Spindle speed, rpm | 450, 800, 1400, 2500, 4500 | 720, 1400, 2000 |
| Number of spindle speeds | 5 | 3 |
| Spindle taper | Morse B18 | Morse B18 |
| Drive unit | ||
| Main motion drive electric motor, kW | 0,55 | 0,6 |
| Dimensions and weight of the machine | ||
| Machine dimensions (length width height), mm | 795 x 370 x 950 | 660 x 360 x 750 |
| Machine weight, kg | 120 | 85 |
The NS-12 tabletop drilling machine was developed by the Vilnius machine-tool plant “Zalgiris”. It differs from similar equipment in its simple layout, reliability and fairly accurate material processing parameters.
Machine design
This model is designed for forming holes in small workpieces made of various materials: steel, wood, polymers. If you have a tap, the thread can be cut. It has found application in repair shops and is widely popular among home craftsmen.
The design consists of a work table, which serves as a base. On its surface there are polished T-shaped grooves for fixing the workpiece. A vertical column is installed on the frame, in the upper part of which electrical equipment, a spindle head and shafts for switching the number of revolutions are mounted.
The passport describes in detail the design features of the NS-12 desktop machine. They are as follows:
- use of cast iron bodies. This ensures long term maintenance-free operation of the equipment;
- convenient system for changing the spindle speed. For this purpose, pulleys of various diameters are installed on the headstock and electric motor shafts. The drive is carried out using a belt drive;
- Precision processing provides a report of the drilling depth on a stop or on a flat scale.
The original belt tension system makes it possible to change gears. But to do this you need to wait until the electric motor stops completely. To drive the spindle head on the NS-12A machine, you can install flat and toothed belts.
When working on the equipment, it is mandatory to install a protective casing on the shaft with spindle pulleys. This will prevent dangerous situations from occurring.
Specifications
To become familiar with the exact technical parameters of the machine model NS-12, it is necessary to study the equipment passport. It indicates not only the arrangement of elements and characteristics, but also provides recommendations for operation.
The weight of the NS-12A machine, 121 kg, is enough to dampen vibrations that inevitably appear during operation. Its dimensions are 77*46.5*70 cm and allow you to install the equipment on a small desktop area. The electric motor power is relatively small - 0.65 kW. However, unlike similar models, it is designed for connection to a single-phase 220 V network, which makes it possible to use the drilling unit at home.
But for a full analysis of the capabilities of a desktop machine, you should carefully study the technical data sheet. The main characteristics of the equipment are indicated there:
- the maximum permissible drilling diameter is 12 mm;
- distance from the end of the spindle to the surface of the work table – from 2 to 42 cm;
- spindle reach - up to 8.5 cm;
- desktop dimensions – 36*36 cm;
- number of T-shaped slots for fixing the workpiece – 3 pcs.;
- maximum spindle head displacement – 30 cm;
- sleeve stroke – up to 10 cm;
- rotation speed options - from 450 to 4500 rpm;
- number of speeds – 5.
These parameters allow you to drill and form threads using dies with fairly high accuracy. Before starting work on the NS-12A machine, you need to read the passport, study the safety rules and the methodology for carrying out repair and preventative measures.