Vertical drilling and slotting machine SVP 2. Vertical drilling and slotting machines - woodworking machines. Preparation for work and maintenance

Drilling machines are designed for drilling through and blind round holes in materials. Depending on the direction of drilling, machines are divided into vertical and horizontal.

Based on the number of simultaneously working drills, single-spindle and multi-spindle machines are distinguished.

Design features. Vertical slot drilling machines are used to perform two types of operations: drilling holes and processing slots with rounded edges, in which the radius of curvature is equal to the radius of the end mill. As a rule, the machine has one vertically located spindle, moved along its axis using a lever. The belt drive pulley is mounted on a hollow coupling shaft that rotates with the pulley. Inside, along the entire length of the coupling, there is a groove into which the spindle, placed inside the coupling, fits with its ridge. This fastening allows not only to transmit movement from the coupling to the spindle, but also to move it vertically.

This movement is performed either manually by means of a lever surrounding the clutch with a fork, or using a foot pedal and lever transmission. To maintain the material in the position required for processing, there is a rotating console.

The industry produces universal slot-drilling machines with manual (SVP - 2) and mechanized feeding (SVA - 2) of tools to the part.

In Fig. 124 shows a diagram of a vertical slot-drilling machine with manual feed SVP - 2. A column 1 is installed on the cast-iron base of the machine 14. An electric motor 4 and a spindle mechanism 7 are mounted in its upper part, on which a chuck 8 with a cutting tool is mounted. In the middle part of the column there is a bracket 12, which can move along the column. It is driven by handwheel 3 and fixed vertically by handle 2 depending on the height of the workpiece.

Rice. 124. Diagram of a vertical drilling and slotting machine with manual feed SVP-2:
1 - column; 2 - handle; 3 - flywheel; 4 - electric motor; 5 - spindle movement lever; 6 - spindle movement handle; 7 - spindle mechanism; 8 - cartridge; 9 - eccentric clamp; 10 - table; 11 - table movement flywheel; 12 - bracket; 13 - spindle pedal; 14 - iron frame; 15 - spindle pedal rod

The bracket is equipped with a slide along the guides of which, using a handwheel 11, a table 10 moves, which can be rotated in both directions by 90° around a horizontal axis. There is a stop ruler and an eccentric clamp 9 on the table.

Inside the base of the column there is an axis on which the spindle pedal 13 with a drill is attached. Rod 15 connects the pedal lever with the lever 5 for moving the spindle in the head. There is a spring on the rod to return the spindle to its original position.

Handle 6 is connected to the axis of lever 5 and is designed to move the spindle down and brake when the handle is raised. The spindle rotates from a two-speed electric motor 4 through a V-belt drive. The belt is tensioned when the plate with an electric motor is moved along the guides using a screw and nut.

Technical characteristics of the SVP machine:

• Drilling diameter (mm) - up to 50
• Drilling depth (mm) - up to 150
• Drill speed per minute - 3000 and 4500
• Groove length (mm) - up to 200
• Electric motor power (kW) - 1.6 - 2.2
• Machine weight (in kg) - 360

Multi-spindle vertical machines are mainly used for drilling knots. The presence of different diameters of special (plug) drills allows you to select them according to the required size without rearrangement.

TO category:

Woodworking machinery

Vertical drilling and grooving machines

Machine design. Vertical drilling and grooving machines are produced with manual (SVP-2) and mechanical (SVA-2M) feed. A vertical drilling and slotting machine with manual feed SVP-2 is shown in Fig. 1. A spindle with a drive through a belt drive from an electric motor and a table are installed on the column of the machine. The working spindle rotates in bearings and is enclosed in a guide sleeve that moves up or down from the pedal or handle. At the end of the spindle there is a chuck for mounting a drill or end mill with a maximum diameter of 40 mm.

The machine table is located on the horizontal guides of the bracket and has a longitudinal feed through a rack and pinion mechanism from the handwheel 9. The bracket together with the table can be adjusted in height in accordance with the height of the workpiece using the handwheel and fixed in a given position with a removable handle.

In addition, the table can be rotated at the desired angle or positioned vertically if it is necessary to drill a hole at an angle to the base surface of the part or its edge. The workpieces are secured with an eccentric clamp.

The vertical drilling and slotting machine with mechanical feed SVA-2, unlike the SVP-2 machine, is equipped with a pneumatic cylinder for moving the sleeve with a spindle, as well as pneumatic clamps.

Selecting the operating mode. The spindle speed of drilling machines usually does not change. However, the speed of different points of the end cutting edges of the drill is different. The points furthest from the drill axis have the highest cutting speed. As you approach the center of the drill, the peripheral speed of the main movement decreases, and the speed of the translational feed movement is the same for all points. Therefore, in the central part of the hole, the wood fibers are not cut; but they are crushed, moved apart by the center and partially destroyed. The feed per revolution So of a drill for soft wood is taken to be 0.7...2.2 mm, for hard wood - 0.1...0.5 mm. Lower values ​​should be used when drilling deep holes of small diameter.

Rice. 1. Vertical drilling and grooving machine with manual feed SVP: 2: 1 - column, 2 - table lifting handwheel, 3 - electric motor, 4, 11 - handles, 5 - spindle, 6 - chuck, 7 - clamp, 8 - table, 9 - handwheel for longitudinal table feed, 10 - bracket, 12 - pedal

Setting up machines. The type and diameter of the drill or end mill is selected depending on the nature of the drilling. Drills for drilling along the grain cannot be used to make holes perpendicular to the grain. The sharpening angle of twist drills must correspond to the direction of drilling relative to the wood grain.

The diameter of the drill is selected depending on the size of the hole. It should be taken into account that the diameter of the resulting hole is 0.2...0.35 mm larger than the diameter of the drill due to the breakdown of the hole due to the beating of the drill.

Drills are mounted on the spindle using chucks or installed in the spindle. A chuck with a locking screw (Fig. 2, a) can be used to install drills with cylindrical shanks of only one diameter; it does not ensure accurate centering of the drill relative to the spindle axis.

The most widespread are three- and two-jaw self-centering chucks (Fig. 2, b). They allow you to fix drills with different shank diameters. First, the threaded part of the cartridge is screwed onto the spindle. The drill is secured in the chuck with cams, moving them with a nut in the radial direction. Clamp the drill with sufficient force so that it does not rotate during operation. Rotating the spindle

manually, make sure that the drill is secured correctly and has no runout. The accuracy of drill installation in a jaw chuck depends on the manufacturing accuracy of the chuck and the degree of its wear.

The height of the table is adjusted so that when the spindle is in the uppermost position, the distance from the top of the drill to the working surface of the table is 20 mm greater than the height of the workpiece.

If it is necessary to drill a hole obliquely to the base surface of the part, the table is rotated to the required angle. The position of the table is adjusted with a handwheel or handle, and the amount of movement is counted on a scale.

The stops that limit the movement of the table are set depending on the length of the socket. When drilling holes, the machine table is fixed with a locking device. The stroke of the sleeve with the spindle is limited by a stop, which is set in height depending on the depth of the hole or socket. The end stops that base the workpiece are adjusted depending on the working conditions.

Rice. 2. Installation of the drilling tool on the spindle: a - in a chuck with a locking screw, b - in a three-jaw self-centering chuck; 1 - drill, 2 - screw, 3 - chuck, 4 - spindle, 5 - nut, 6 - clamping jaws

A distinction is made between drilling holes according to markings, using stops and using templates (conductors).

When drilling according to preliminary markings, end stops are not required. Using the marks, the part is oriented each time on the table relative to the drill. If you need to drill several holes according to the markings, located at the same distance from the edge of the part, use a guide ruler (Fig. 3, a). The ruler is fixed on the table so that the required distance a from the axis of the drill 3 to the working surface of the ruler is ensured.

Rice. 3. Setting up a vertical drilling and grooving machine: a - setting the guide ruler, b - setting the end stops; 1 - table, 2 - ruler, 3 - drill, 4 - stops

Drilling along the stops should be performed when processing large pairs of parts, such as parts with several holes of the same diameter (Fig. 3, b). The stops in the form of spring plates are fixed in the grooves of the guide ruler. The distance a and iv between the stops is made equal to the distance between the holes in the part. The part is based with its end on the next stop, and the unused stops are recessed with the part into the groove of the ruler.

Templates are used to drill several holes in panel parts. The location of the holes in the template corresponds to the location of the holes in the finished part.

The clamp is placed on the stand near the hole being drilled and securely secured with a locking screw.

Working on machines. One worker works on the machine. It turns on the feed, the clamps are automatically activated, the spindle is fed to the workpiece and drilling is performed. The spindle feed speed is set depending on the diameter, depth and location of the hole being drilled in relation to the wood fibers. In machines with mechanized feed, the speed is controlled by a throttle. The machine operator places the finished parts in a stack.

The groove is sampled in the following order. First, without lateral feeding of the table, two holes are drilled at the ends of the future groove. Then the gap between the round sockets is removed using the groove milling method when the table is fed from the side. In order to avoid cutter breakage, the chip width should not exceed 1.5 times the cutter diameter. Deep grooves are milled in two or more passes.

During work, periodically check the groove or hole diameter, as well as their position relative to the edge of the part, using a gauge or measuring tool. The deviation of the hole from perpendicularity to the base surface of the part is allowed no more than 0.15 mm over a length of 100 mm.

At the same time, the quality of the treated surfaces should be monitored. If moss appears, you need to change the drill.

Working at an excessively high feed rate with a dull drill will cause its breakdown or unacceptable overload of the spindle drive motor.

Drilling machines Designed for drilling through and blind round holes in materials. Depending on the direction of drilling, machines are divided into vertical and horizontal. Based on the number of simultaneously working drills, there are single-spindle and multi-spindle drills.

Vertical drilling machines They have one, as in the SVP machine (Fig. 136), a vertically located spindle, moved along its axis using a lever. The belt drive pulley is mounted on a hollow coupling shaft that rotates with the pulley. Inside, along the entire length of the coupling, there is a groove into which the spindle, placed inside the coupling, enters with its ridge. This fastening allows not only to transmit movement from the clutch to the spindle, but also to move it vertically, which is done either manually using a lever that covers the clutch with a fork, or using a foot pedal and lever transmission. To maintain the material in the position required for processing, there is a rotating console.

Technical characteristics of the SVP machine

Multi-spindle vertical machines are mainly used for drilling knots. The presence of different diameters of special (plug) drills allows you to select them according to the required diameter without rearrangement.

Horizontal drilling and slotting machines have a drill fixed in a horizontal shaft (spindle) with a clamping chuck. The spindle moves horizontally along the axis using a lever. As a result, the drill goes deeper into the wood. The most commonly used are slotted and twist drills.

Drilling and slotting machine SVG(Fig. 137) is similar to drilling machines in its design and operation. The difference lies in the drills used: for selecting grooves and sockets, they use mainly groove drills, and for drilling - spiral drills, which provide the best ejection of chips from the hole, and plug drills for drilling out knots. The machine is equipped with a movable table that is moved horizontally in a direction perpendicular to the spindle axis using a lever and vertically using a screw with a flywheel.

When working with a drill, the socket is obtained with rounded edges. Therefore, to give the nest a rectangular shape, the machine is equipped with a special chisel for trimming the edges of the nest. If such a chisel is not available, use a chisel to trim the protrusions of the socket or chamfer the tenons inserted into these sockets.

Technical characteristics of the SvGD-3 machine

Svpa drilling and slotting machine with automatic feed equipped with a spindle that performs oscillatory motion in a horizontal plane. The machine is equipped with a hydraulic drive to secure the part and to feed the drill to a given depth. The desktop is moved using a foot pedal.

Technical characteristics of the SvPA machine

Multi-spindle drilling and filler machines used mainly in the manufacture of parts connected on dowels.

Such machines have several permanent or sliding drilling spindles, a table for strengthening parts, and an automatic feed drive.

Nine-spindle drilling machine model SV-9(Fig. 138) has three groups of drilling heads, a table with clamps for fastening and feeding bars, a crank-crank system for setting the table feed depth with rack and pinion feed.

Technical characteristics of multi-spindle machines

Drilling power head Designed for drilling holes and making grooves in parts. The head is installed on aggregate machines. When installed on continuous-through machines, a special device is mounted to it, with the help of which the head spindle moves after the product during the drilling process. The heads can also be installed on conventional machines.

Drilling head AG2-4 on a skid (Fig. 139) consists of a housing, inside of which hydraulic cylinders are installed, a carriage with an electric motor mounted on it, and the drilling head itself. The carriage moves along the housing guides hydraulically using a rod, and the working speed is regulated using a throttle (damper). The head can work without attachments with a single drill and with attachments: three-spindle type AG2-4-3 and five-spindle type AG2-4-5 for simultaneous drilling of three or five holes in parts. There are 4 rollers mounted inside the nozzle body, 3 of which are spindles with drill chucks at the ends, and the fourth - intermediate - serves to transmit rotation to one of the spindles from the drive gear of the head.

Technical characteristics of the drilling head AG2-4

Chain-slotting machine DCA-2(Fig. 140) is equipped with a cutting milling chain, consisting of hinged links and sharpened to the shape of the cutter tooth (cutter). The chain is driven by a drive sprocket and guided by a special bar (tire). Cutting (chipping) occurs when the chain is buried in the wood. The nest is rectangular in shape with a rounded bottom. The machine support is equipped with a hydraulic drive to feed the chain to a given depth.

The workpiece is fixed on a movable table that moves vertically with a screw and horizontally with a lever. The table is equipped with a screw to strengthen the part and stops (stops) that limit the horizontal movement of the table in accordance with the length of the selected socket.

To make it possible to tension the milling chain, the guide bar is made sliding (using a screw). Before work, the chain tension must be adjusted. A weakly tensioned chain results in uneven processing of the side surface of the sockets and can jump off the tire; A chain that is too tight may break. Usually the chain is tensioned so that with a light hand effort it can be pulled back in a straight section. 3-5 mm from the tire.

Technical characteristics of the DTSA-2 machine

Information about the manufacturer of the drilling and slotting machine SVPG

The manufacturer of the SVPG-2a drilling and grooving machine is Dnepropetrovsk machine tool plant DSPO currently LLC "Stankostroitel".

In the USSR, the Dnepropetrovsk Machine Tool Plant specialized in milling group machines throughout its existence. However, in May 1999, this largest production of machine tools in Ukraine was restructured, and as a result, six independent enterprises appeared, one of which is Stankostroitel LLC.

In Russia, the Kirov Machine Tool Plant produces SVPG-1e drilling and grooving machines, which have one work table.

SVPG-2a Drilling and grooving machine. Purpose, scope

The SVPG-2a drilling and grooving machine is designed for making grooves and drilling holes simultaneously in two wood products.

The machine bed is solid, box-shaped. Mounted on the frame are: two tables with clamps powered by compressed air, with hydraulic control of the working feed rate. The tables have a horizontal working feed and vertical adjustment movement.

The table feed to the groove depth and the workpiece clamp are pneumatic. All this increases the productivity of the machine (compared to SVPG-1R) by more than two times.

The drive for rotation and oscillation of the spindle is from a two-speed electric motor. The spindle is double-sided, the cutting tool is fixed on both sides. The reciprocating movement of the spindle is carried out on linear rolling bearings. Due to the fact that the transmission from the motor to the spindle is belt driven, and the spindle itself moves along the length of the groove on the slide, high precision of the drilled groove is achieved.

The working movement of tables with clamped parts to the cutting tool is carried out alternately in a continuous cycle. Table withdrawal has been accelerated.

The machine is equipped with a special spindle lock in the extreme position at all groove lengths, scales of working and installation movements, as well as a device for basing the workpieces on tables.

Operating principle of a drilling and slotting machine

Processing of workpieces on a machine is carried out by milling with end mills with axial and radial feeds simultaneously when grooving and only with axial feeds when drilling with drills.

The processing cycle is semi-automatic with manual installation of workpieces and their removal after processing.

Clamping of workpieces, working feed, return to the starting position and release of the clamp alternately on both tables is carried out automatically with an adjustable duration of the processing cycle.

When you press the “machine stop” button or the compressed air pressure in the pneumatic system drops below 0.4 MPa (4 kgf/cm2), the machine drive is turned off, the tables return to their original position, and the clamps release the workpieces, regardless of the processing phase of the installed workpiece.

Basic movements in the machine

The machine has the following working movements:

• rotational movement of the spindle;
• reciprocating spindle is perpendicular to its axis in the horizontal plane;
• reciprocating tables parallel to the spindle axis;
• reciprocating pressure heels.

In addition to working movements on the machine, there are adjustment movements:

• vertical movement of the table;
• rotation of the table around a horizontal axis parallel to the spindle axis;
• vertical and horizontal clamping.

The reciprocating motion of the spindle is made with an adjustable amplitude and frequency of oscillations, and the table with an adjustable working feed rate.

SVPG General view of the drilling and slotting machine

1. Bed SVPG-2A.11.000 - 1
2. Table SVPG-2A.22.000 - 2
3. Clamp SVPG-2A.27.000 - 2
4. Tank SVPG-2A.29.000 - 1
5. Spindle SVPG-2A.31.000 - 1
6. Crank SVPG-2A.50.000 - 1
7. Fencing SVPG-2A.79.000 - 1
8. Chip receiver SVPG-2A.76.000 - 2
9. Pneumohydraulic equipment SVPG-2A.66.000 - 1
10. Electrical equipment SVPG-2A.80.000 - 1

1. Groove length adjustment screw
2. Nut for fixing the installed groove length
3. Spindle position lock
4. Handle for fixing the table against vertical movement
5. Handwheel for vertical table movement
6. Screw for fixing the work feed stop
7. Table feed limit stop
8. Stop for limiting table travel back
9. Screw for fixing the stop for limiting the table travel back
10. Clamp position locking handle
11. Machine stop button
12. Spindle start button
13. Signal light "Spindle rotates"
14. Continuous cycle switch
15. Signal light Machine under voltage
16. Introductory machine handle
17. Spindle speed switch handle
18. Table fixation pin in zero position
19. Handle for fixing the table on the rotation axis
20. Belt tension screw
21. Friction gear flywheel disengagement handle
22. Plate for fixing the disabled spindle oscillation drive
23. Feed rate button
24. Belt tension nut

Kinematic diagram of the SVPG-2A drilling and slotting machine

The kinematic chains of the machine carry out the following movements:

1. Rotation of the spindle of the cutter, drill
2. Oscillatory movement of the spindle head in the horizontal plane
3. Working feed of tables from pneumatic cylinders along the spindle axis
4. Installation manual movement of the table up and down
5. Clamping the workpiece using a plunger pneumatic cylinder
6. Tilt of tables around a horizontal axis parallel to the spindle axis
7. Fixing tables in the desired position

On the shaft of the electric motor 1, a pulley 2 and a roller 3 are mounted, the rotation from which through the belt 5, pulley b is transmitted to the spindle I, and through the flywheel 7 to the intermediate shaft II.

Intermediate shaft II is mounted on the sub-motor plate 8 with the ability to rotate on axis III, providing a change in the gear ratio of the friction disk drive 3, 7 by moving the flywheel 7 on shaft II, and accordingly the oscillation frequency of the spindle I.

A pulley 9 is rigidly fixed to shaft II, the rotation from which is transmitted through a belt 10 to a pulley 11 mounted on axis IV.

A stand, which is a pin of the crank mechanism, is attached to the pulley 11 with the possibility of movement in the radial direction and fixation by means of a nut.

The spindle I, perpendicular to the axis of rotation along two guides, is brought into oscillatory motion by the crank mechanism through the connecting rod 12, lever 13 and shackle 14. Lever 13 is fixed to the frame by means of axis V. Belt 5 is tensioned by moving the electric motor M relative to spindle I with a screw, and belt 10 with a spring-loaded roller, which is fixed to axis VI by means of a lever.

A pin is attached to the connecting rod 12 with axial movement on the thread, which secures the spindle I from movements (oscillations) by inserting it into the T-shaped groove of the pulley 11.

The machine tables have a working feed by means of pneumatic cylinders, installation vertical movement by means of gears 15 and 16 and screw pairs 18 and 17, and an inclination around the horizontal axes VII and VIII with fixation of the required location of their working surfaces relative to the direction of spindle oscillations with nuts.

General layout of the SVPG drilling and slotting machine

All components of the machine are mounted on the frame, namely:

• on the upper plane there is a spindle and a control panel;
• on the side frames there are tables with clamps;
• Inside the frame there is a niche for electrical equipment, an electric motor, a friction flywheel, two poly-V belt drives, a crank and rocker mechanism for driving rotation and reciprocating movement of the spindle, as well as pneumatic control and locking equipment.

bed

The frame is cast, box-shaped, with windows for installation and maintenance of the mechanisms and equipment located in it. The windows are closed with doors and covers. Inside the frame there is a niche for electrical equipment, two belt drives, a friction disk drive, a crank mechanism, a lever, an earring and a reservoir. The spindle and control panel are mounted on the top wall of the machine, and tables with clamps and chip collectors are mounted on the side walls.

Table (Fig. 6.4)

The table includes a bracket I fixed to the frame along prismatic guides of which a slider 2 with a body 3 attached to it has a vertical movement. The slider is moved manually by means of a gear 4, 5 and a screw 6, 7.

The slide 9 with the table 10 moves along the prismatic guides of the housing 3 by means of a pneumatic cylinder 8. The connection of the slide 9 with the table 10 is made by axis II, located parallel to the direction of its movement. Around the axis, the table has an adjustment movement of the location of its working surface relative to the direction of oscillation of the spindle, fixed by handle 12.

Parallel to the pneumatic cylinder 8, a plunger hydraulic cylinder 13 is fixed in the housing 3, which provides (by throttling the oil displaced from it) regulation of the operating feed rate.

Clamp

The clamp is a plunger pneumatic cylinder with a spring return, consisting of a body 1, a rod 2, a spring 3 and a rubber-coated round foot 4.

The body 2 is mounted on a round rod 5, which is secured to the table stand by means of a split coupling 6 with a handle 7.

Tank

The tank is a container for oil, it includes a pipe 1 with two covers 2 and 3. The bottom cover has two holes for connecting oil lines, on the top cover there is an oil hole, which is closed by a plug 4 with a dipstick 5 for determining the oil level and built into it inlet check valve 6.

Spindle

The spindle includes a cast housing 1, in which a shaft 2 is mounted on two paired angular contact bearings with spring tension for selecting clearances, at the ends of which there are borings and external threads on both sides for fastening the cutting tool using collets and nuts 4. In the spindle housing, parallel holes are made perpendicular to its axis, in which linear movement bearings 5 ​​are fixed to carry out spindle oscillations and one hole parallel to the spindle axis for connecting the oscillation drive mechanism shackle.

Crank

The crank includes an axis 1, fixedly fixed in the frame, on which a pulley 2 with a T-shaped groove is mounted by means of two radial ball bearings. A crank axis 3 is movably mounted in the T-shaped groove, having an installation movement with fixation through a screw transmission 4. A connecting rod 5 for the spindle oscillation drive with a pin 6 for fixing the spindle in the extreme position is secured to the crank axis by means of a radial bearing. Pin 6 is connected to the connecting rod via a thread, and fixation is carried out by inserting it into the T-shaped groove of pulley 2.

Fencing

The fence includes a body 1, guides 2 fixed on it and canopies 3 and 5 mounted on the guides, a spring 4, as well as a stop 6 and 7. The canopies 3 and 5 cover the cutting tool and are set to their original position by springs 4.

The initial position of the visors, depending on the overhang (length) of the tool, is adjusted by stops 6 and 7.

Chip receiver

The chip receiver is an open-top container welded from sheet iron with a pipe for connecting exhaust ventilation. It is mounted on the table bracket under the cutting tool. There are two chip receivers installed on the frame - left and right.

Table of the SVPG-2A drilling and grooving machine. Rice. 8

Electrical equipment of the SVPG drilling and slotting machine

Electrical diagram of the SVPG-2A drilling and slotting machine

General information

The electrical equipment of the machine includes a two-speed electric motor with a squirrel-cage rotor: as a spindle drive and a swing mechanism.

The electrical equipment of the machine is designed for power supply from an alternating current network of 380V, 50 Hz.

Electrical parameters of circuits:

• power circuit ~ 3; 380V; 50 Hz;
• control circuit ~ 220V, 50Hz;
• signaling circuit ~ 220V, 50Hz.

The following are installed in the electronics compartment of the machine:

• panel with relay-starting protective electrical equipment;
• input circuit breaker with remote control device with lock;
• switch for selecting the rotation speed of the spindle drive motor.

The control panel is equipped with: signal lamps, control buttons for machine drives.

The wiring of power and control circuits throughout the machine is made using PVZ wire. The selection and installation of the power cable for connecting the machine and the power supply network is carried out by the customer in accordance with the current value indicated on the plate on the machine (3x1+Nx1+PEx1).

Description of the operating mode of the SVPG-2A drilling and grooving machine

The supply voltage is carried out by switch Q1, the presence of voltage in the machine is signaled by lamp H1.

The position of the switch handle SA1 assembles the winding circuit of a two-speed motor in YY or delta, which corresponds to a spindle speed of 12000 or 6000 rpm.

The control button SB2 turns on the starter K1 and the time relay K2. Starter K1 with its own no. the contact becomes “self-retaining”, supplies voltage to the engine and its no. contact turns on the H2 signal lamp. Relay K2 closes its contact, thereby preparing the circuit for turning on the dynamic braking unit. When you press the button SB1, it locks itself in the pressed position and breaks the power supply circuit of the starter K1, the starter turns off and the engine is disconnected from the supply voltage, the warning lamp H2 turns off. At the same time, the contact of the starter K1 is closed and the starter K3 is turned on, which with its linear contacts connects the dynamic braking unit A1 to the phase voltage of the network - 220V.

The block is a half-wave rectifier using diodes V1 and V2. It ensures the flow of rectified direct current through the stator windings of the motor during the positive half-cycles of the mains voltage. When the specified current flows, the motor creates a braking torque and ensures braking and stopping of the spindle in a time of no more than 6 s. At the end of the time delay of relay K2, its contact in the circuit opens and the braking unit is disconnected from the network.

Pneumohydraulic diagram of the SVPG drilling and slotting machine

Pneumohydraulic diagram of the SVPG-2A drilling and slotting machine

SVPG-2A Drilling and grooving machine. Video

Technical characteristics of the SVPG-2A drilling and slotting machine