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.
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
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.
NS-12B table drill and more
Hello, colleagues and more 
I decided to describe the “rebirth” of the old Soviet machine, NS-12B, manufactured
probably the late 60s of the 20th century.
I received it in a slightly worn condition, i.e. - in good condition, as disassembly and subsequent inspection of the components showed. A very good plus was the spindle, with internal KM1.
Both gear shafts, quill, handles, spindle bushing, rack were in very good condition and
This is due to the high-quality manufacturing of these parts and their short service life.
Electric motor of the old AOL series - cast iron, massive, 0.6 kW, 1400 rpm with six leads
at 220/380V. Shaft 18 mm. The pulley is cast iron.
Just recently I “didn’t like” these electric motors, considering them old, inconvenient, not beautiful,
but after already 2 machines, including this, where I had the opportunity to connect both a frequency converter and capacitors to them, I radically changed my opinion on this matter, because it turned out to be very unpretentious when operating both from capacitors and from a frequency converter with different, by the way (not serial)
connecting wires.
I don’t know what this is connected with, this is electrical engineering and only “knowledgeable” people can give competent arguments. But this is a fact.
The first step, naturally, was to bring the machine to its “original appearance”—cleaning off the old paint,
where my faithful assistants were an angle grinder with a cord brush.
Next - replacing all the bearings, although at first I left them in the quill without changing them, but after the first test run I realized that no, this won’t work, given that I discovered a clear beating of the quill.
At the same time, the machine was primed, followed by test painting.
Unfortunately, some of the photos were not preserved, because... the beginning of the cleaning process was in the fall of 2016, and the main photos already appeared and were saved this spring.
The machine pleased me with the complexity of its components, because after 2M112 and this machine, I saw a significant difference.
In 2m112 everything is already simplified and there are no extra screws, fasteners, washers, spindle headstock cuts,
grooves and-and-and...
In general, Soviet “optimization” had already been applied, when, for the sake of product quality, the cost of goods began to be introduced.
By the end of autumn, the machine was almost ready, with the exception of some minor details, and the project was “frozen until the weather began to warm up, so that with the new spring vital energy, everything could be completed and painted at a comfortable above-zero temperature, because... workshop - not heated at the moment.
