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.
NS-desktop drilling machine. Purpose and scope
The machine is designed for drilling holes in small parts made of cast iron, steel, non-ferrous alloys and non-metallic materials in industrial enterprises, repair and household workshops.
NS-12 machines allow you to perform the following operations:
- drilling
- countersinking
- deployment
- reaming
- thread cutting
Main parameters of the NS-12 drilling machine:
- Maximum drilling diameter: Ø 12 mm
- Maximum drilling depth: 100 mm
- Maximum height of workpiece: 400 mm
- Distance from spindle axis to column (spindle overhang): 185 mm
- Spindle speed: 450, 710, 1400, 2500, 4500 rpm
- Electric motor power: 0.6 kW
- Machine weight: 121 kg
The drilling depth is measured using a flat scale or stop.
Five-speed drive pulleys allow five spindle rotation speeds, which provides free choice of cutting speeds.
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.
The spindle assembly of the NS-12 drilling machine is the most complex and precise assembly in the machine. The spindle assembly is mounted in the spindle head. Main parts of the spindle assembly:
- Spindle - a shaft that rotates on 2 angular contact bearings inside the spindle sleeve;
- The spindle sleeve (quill) is a cylinder that is mounted in the spindle head and has the ability to move axially within 100 mm.
The upper part of the spindle has splines to receive rotation from the take-up pulley, the lower part has a Morse taper for attaching the drill chuck.
The spindle of the NS-12 machine receives five rotation speeds from five-stage drive pulleys, which provides free choice of cutting speeds of 450, 800, 1410, 2490, 4430 rpm.
The quill, inside which the spindle rotates, has a stroke of 100 mm and is balanced by a spiral spring, which returns the quill to the upper (original) position. The quill is raised and lowered by a rack and pinion. The maximum cutting force allowed by the mechanism is 70 kg.
The end of the spindle of the NS-12 drilling machine is an internal Morse cone No. 1, D = 12.065 mm according to GOST 25557 (Tool cones). To install a standard drill chuck with a shortened cone on the machine, you need to install a mandrel in accordance with GOST 2682 (Mandrels with a Morse taper for drill chucks).
On the NS-12 machine you can install one of 4 mandrels in accordance with GOST 2682:
- Mandrel 6039·0002 - version 2, shortened Morse taper B10
- Mandrel 6039·0005 - version 2, shortened Morse taper B12
- Mandrel 6039·0007 - version 2, shortened Morse taper B16
- Mandrel 6039·0011 - version 2, shortened Morse taper B18
So, using one of the 4 mandrels, you can install a drill chuck of one of 6 standard sizes in accordance with GOST 8522 (Three-jaw drill chucks).
- Chuck 4 - shortened Morse taper B10 , clamping range - 0.5..4 mm
- Chuck 6 - shortened Morse taper B12 , clamping range - 0.5..6 mm
- Chuck 8 - shortened Morse taper B12 , clamping range - 1.0..8 mm
- Chuck 10 - shortened Morse taper B16 , clamping range - 1.0..10 mm
- Chuck 13 - shortened Morse taper B16 , clamping range - 1.0..13 mm
- Chuck 16 - shortened Morse taper B18 , clamping range - 3.0..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.
The 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), Cartridge 8-B12 (1÷8 mm);
- B16 - Morse cone KM2 , D = 15.733 mm. Cartridge 10-B16 (1÷10 mm), Cartridge 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 is the diameter of the cone in the main plane.
Analogues of the desktop drilling machine NS-12
2M112 - Ø12 - Kirov Machine Tool Plant, Kirov
NS-12A - Ø12 - Vilnius Machine Tool Plant
NS-12B, NS-12M - Ø12 - Barnaul Machine Tool Plant
ENS12 - Ø12 - Yeysk machine tool plant ESZ, Yeysk
OD71 - Ø12 - Orenburg Machine Tool Plant, Orenburg
NS-12B, NS-12-M - Ø12 - Barnaul Machine Tool Plant
SHUNSS-12 - Ø12 - Mukachevo Machine Tool Plant, village. Kolchino
GS2112 – Ø12 – Gomel Machine Unit Plant
ZIM1330.00.00.001 - Ø12 - Maslennikov Plant, ZIM-Machine Tool Builder, Samara
MP8-1655 - Ø12 - Machine Tool Plant named after. Kirov, Minsk
BS-01 - Ø12 - Bevers, Berdichev
VS3-5016 - Ø12 - Voronezh Machine Tool Plant
R175M - Ø12 - Chistopol AutoSpetsEquipment plant, Chistopol
Р175, Р175М – Ø13 – AutoSpetsEquipment
VI 2-7 - Ø14 - Volgograd Tool Plant
MD-23 – Ø14 – Kaunas Machine Tool Plant
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 coolant 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.
Engine subplate
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.
How does the kinematic diagram of the machine work?
The electric motor of the drilling machine rotates a five-speed pulley fixed on its shaft, the torque from which is transmitted through a V-belt to the pulley of the spindle assembly. The vertical movement of the sleeve and, accordingly, the spindle assembly is carried out due to the rack and gear fixed on it, which is rigidly connected to the corresponding control handle.
Kinematic diagram of the NS12 drilling machine
The trunk of the NS-12 drilling machine moves in the vertical direction also due to the rack and pinion transmission, the operation of which was described above. The shoe, mounted on the base plate, has a special clamp, after loosening which you can rotate the column together with the trunk around its axis.
Drawings of pulleys for the NS-12 machine (click to enlarge)
To ensure operator safety, a cast or extended welded casing is mounted on the drill press belt drive.
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.
What does the electrical diagram of the device include?
This characteristic of the machine of this model, such as ease of use and repair, is determined, among other things, by the simplicity of the electrical circuit. The elements of the electrical circuit of the NS-12 drilling machine, which are responsible for controlling the equipment, are the “Start” button, when pressed, the drive motor is started, and the “Stop” button, with which the electric motor is turned off.
The characteristics of the drilling machine include the presence of local lighting, which is turned on when the handle of the corresponding batch switch is turned. The operation of the local lighting system requires the use of a step-down transformer, which is mounted in close proximity to the machine.
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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
General view of the drilling machine TMNS-12
Photo of drilling machine TMNS-12
Photo of drilling machine TMNS-12
Photo of drilling machine TMNS-12
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.
