The accuracy of machines in an unloaded state is called geometric. Depending on the accuracy characteristics, CNC machines are divided into four classes in order of increasing accuracy: normal H; increased P; high B; extra high A.
Machine tools elevated precision differ from machine tools normal accuracy, mainly by more accurate execution or selection of parts, as well as individual features of installation and operation by consumers. They provide processing accuracy on average within 0.6 deviations obtained on machines of normal accuracy. CNC machines high accuracy of class B provide processing accuracy within 0.4, and class A machines - within 0.25 deviations obtained on machines of normal accuracy. Machine tools of classes B and A are obtained as a result of a special design, their components and elements, as well as high manufacturing accuracy.
When checking the accuracy standards of machine tools, they establish * the accuracy of geometric shapes and the relative position of the supporting surfaces basing the workpiece and tool; accuracy of movements along the guides of the working bodies of the machine; the accuracy of the location of the axes of rotation and the trajectories of movement of the working bodies of the machine, carrying the workpiece and tool, relative to each other and relative to the basing surfaces; accuracy of the processed surfaces of a sample; roughness of the machined surfaces of the sample.
Accuracy check
The accuracy of CNC machines is additionally determined by the following specific checks: the accuracy of the linear positioning of the working bodies; the size of the dead zone, i.e., the lag in the displacement of the working bodies when changing the direction of movement; the accuracy of the return of the working bodies to their original position; the stability of the exit of the working bodies to a given point; the accuracy of working off the circle in the circular interpolation mode; the stability of the position of the tools after automatic change.
During checks, both accuracy and stability are revealed, i.e., the repeated repetition of the arrival of the working bodies in the same position, and stability is often more important for achieving the accuracy of machining on CNC machines than accuracy itself.
The total allowable error in the positioning of the working bodies Δ p = Δ + δ.
Based on the allowable deviations, largest error in working out movement, for example, 300 mm long along the axes X and Y for a class P machine it will be 17.2 microns, and for a class B machine it will be 8.6 microns.
To maintain the accuracy of the machine for a long time of operation, the norms of geometric accuracy for almost all checks in the manufacture of the machine, in comparison with the normative ones, are tightened by 40%. Thus, the manufacturer reserves a wear margin in the new machine.
FACTORS DETERMINING THE ACCURACY OF THE TURNING
CNC MACHINE
Dots, V.V. DO DONOV, Assoc. Yu.V. NIKULIN
The article deals with the formation of the accuracy of lathes. Experimental methods for estimating the accuracy of rotation of the spindle assembly by the parameters of its circular trajectories with and without application of workloads are presented; the issues of determining the accuracy of the movement of the machine support, the influence of thermal deformations of the machine on its accuracy are discussed. The scheme of the measuring and testing installation and the results of measuring the parameters characterizing the accuracy of lathes are given.
Questions of precision quality shaping of lathes are examined in this article. Experimental methods of an exactitude estimation of a head slide rotation on parameters of its circular trajectories with and without the application of working loadings are presented. Also questions of running accuracy of a planning tool box, influence of thermal strains of the machine tool on its exactitude are discussed. The scheme of measuring and presetting station and results of measurements on parameters describing the exactitude of
lathes are presented in conclusion.
Improving the quality of machine tools is one of the main problems of modern mechanical engineering. The technological process of machining must guarantee the specified quality of parts manufacturing in accordance with the established drawings and technological requirements. The most important component, means of implementation technological process- a metal-cutting machine is a complex precision technological machine, which forms the quality indicators of parts processed on it. The quality level of a metal-cutting machine is determined mainly by the requirements for the accuracy of the machined parts - the accuracy of dimensions, shape, relative position, machined surfaces, roughness, waviness. More high requirements to machine tools arise during the final processing, which forms the parameters of the rigidity of the workpiece. In view of this, the rigidity indicators of a metal-cutting machine are the main indicators, the implementation of which determines the effectiveness of its application.
Tests of lathes for geometric and kinematic accuracy include checking the accuracy of spindle rotation, the straightness of the guides, the straightness of the movement of the calipers, the correctness of the mutual movement of the machine nodes, the parallelism and perpendicularity of the guides and the spindle axis.
Machine tool tests for static stiffness include the measurement of deformations under the working load of nodes lathe- spindle unit and caliper. Dynamic processes in the machine during cutting are measured when testing the machine for vibration resistance, which has a direct effect on the shape accuracy of the machined part, the waviness and roughness of the machined surface
ness. With increasing requirements for machining accuracy, thermal deformations play an increasingly important role in shaping machining accuracy.
Machining accuracy on lathes is largely determined by the geometric accuracy of the machines, the geometric accuracy of the spindle assembly (SHU),
yes longitudinal and transverse feed, the carrier system of the machine, which mainly determines the accuracy of the relative position of the tool and the part during processing,.
The accuracy of machining on lathes is determined by the complex influence of the subsystems, factors, and components included in the technological system of the machine (Fig. 1).
Rice. one. Technological system machine tool
The accuracy of metal-cutting machine tools is determined by three groups of indicators: 1) indicators characterizing the accuracy of processing product samples; 2) indicators characterizing the geometric accuracy of machine tools; 3) additional indicators.
The geometric accuracy of the machine is characterized by the following groups of indicators: the accuracy of the trajectories of movement of the working bodies of the machine, carrying the workpiece and tool; the accuracy of the location of the axis of rotation and the direction of the rectilinear movements of the working bodies of the machine, carrying the workpiece and tool, relative to each other and relative to the bases; accuracy of the bases of the day of installation of the workpiece and tool; accuracy of coordinate movements (positioning) of the working bodies of the machine tool carrying the workpiece and tool.
provided by the standards and specifications geometric accuracy checks reflect the effect of machine accuracy on machining accuracy.
Clamping, rotation and processing of the product on a lathe are carried out using a spindle assembly. The lathe is the main subsystem that largely determines the quality of processing: accuracy, surface finish, waviness. A significant contribution to the formation of the quality of processing is also made by other subsystems and factors: fixture errors, errors in the control room, the accuracy of the machine feed drives, control and measurement systems, workpiece properties.
The maximum accuracy of processing diametrical dimensions on modern lathes is estimated at 0.5. L µm, therefore, when developing the main forming units of a lathe - SHU and longitudinal and transverse feed drives, very stringent requirements are imposed, since their geometric errors must be less than the total processing tolerance.
For the experimental determination of the parameters and characteristics of the circular trajectories of the SHU, which determine the permissible rigidity of turning at the department of machine tools and automatic machines of the Moscow State Technical University. N.E. Bauman developed a measuring installation, the scheme of which is shown in fig. 2.
Test setup layout
Strain Gauge Amplifier
digital voltmeter
digital voltmeter
X Coordinate Table
Y coordinate table
Trajectory
spindle axis
Rice. 2. Schematic of the test setup
The scheme of the test setup (information-measuring channel (IMC) circular trajectories (CT)) includes the following measuring instruments and equipment: sensors D1-D4 (primary non-contact information converters of inductive type); tensometric amplifier type UT4-1; analog-to-digital converter; personal computer for collecting the results of the experiment, processing and displaying them on a graphic monitor, printing and plotting devices; hydraulic load device (HLD), which serves to simulate cutting forces. GNU, consists of two mutually perpendicular loading hydraulic cylinders, mounted on a common bracket in the caliper of the machine being tested.
The test and measurement setup contains two measurement channels: along the X-coordinate and along the K-coordinate. specifications test and measurement facility:
measurement range of shifts of the SH axis for each channel, µm ..............................................20
rotational speed range of the control room at which the measurement is carried out,
RPM ............................................... ................................................. .........................±6000
speed of primary converters, ms .............................................................. ..-0.003
maximum measurement error, µm .............................................. ...............±0.5
The accuracy of spindle rotation at idle speed of the machine depends on the mathematical expectation and the standard deviation of the eccentricities for each /-th spindle support from four types of errors: neck runout relative to its axes; runout of the raceway of the inner ring of the bearing relative to the mounting hole; runout of the raceway of the outer ring of the bearing relative to its outer surface; misalignment of the mounting hole for the bearing in the headstock (quills).
deviations
runout of the spindle assembly of the STP-125 lathe gave the following results:
affecting the accuracy of the lathe is the total
cutting forces were set with the help of GNU
Cutting force Ru
Cutting force Ru
125 250 500 1000 2000
(cupboard uneven)
Axis 1 travel
Rice. 3. Dependency graphs
At MSTU im. N.E. Bauman, a stand was developed at the Department of Metal-cutting Machine Tools for measuring circular trajectories (CT) of the spindle assembly (SHU). The STP-125 machine was used as a test object. Pilot tests were carried out on the SHU according to the parameters of the CT,
Carrying out preliminary tests. Test conditions. The tests were carried out on a machine warmed up for 2-3 hours when turning the control valve manually, at idle with a different number of rotations of the control valve, under a load created by a hydraulic load device (HPU). In the latter case, both the number of revolutions n and the value of the load P (Fig. 3) were varied, which radially loaded a special mandrel inserted into the SHU. The radial displacements of the SB were measured along the coordinates A" and Y. Using 4 inductive non-contact transducers operating at a carrier frequency of 5200 Hz, the signal from the inductive transducers was fed to a four-channel strain gauge amplifier, and then, after the ADC and computer, to the graph plotter.
The results of preliminary tests are shown in fig. 4-6. The tests were carried out at idle at n = 100. On fig. Figures 5 and 6 show typical trajectories of the SHU axis displayed on the computer screen.
The accuracy of spindle rotation depends on the accuracy of the manufacture of its parts, the accuracy of the bearings, the quality of its assembly and adjustment. Spindle rotation errors, first of all, are determined by the difference in wall thickness of the bearing rings and different-sized
Rice. 4. Runout of the spindle axis at idle
Fig. 5. Trajectory of the axis of the spindle assembly
Rice. 6. Trajectory of the axis of the spindle assembly
Tew rolling bodies. This error for bearings of small and medium sizes lies within 1 ... 10 microns (depending on the accuracy class and size of the bearing).
The waviness of the tracks and the geometric errors of the rolling elements cause smaller spindle displacements of the order of 0.1 ... 1 μm and are superimposed in the form of high-quality components on the errors from the difference in wall thickness of the rings.
An even higher frequency and lower amplitude of the spindle oscillations are caused by the roughness of the raceways. The addition of these vibrations causes a complex, complex picture of the movement of the spindle axis in space (Lissajous figures, movement of the spindle axis along a hypocycloid or epicycloid with a different number of loops).
A great influence on the accuracy of rotation of the spindles of machine tools, especially high-speed ones, has a residual imbalance, which is determined in [N mm / N] or in the form of eccentricity e in [μm], which determines the actual displacement of the center of gravity of the spindle relative to the axis of rotation. The chuck mounted on the spindle must also be balanced.
It is not possible to display the results of tests at idle when turning the SHU by hand on a computer due to the peculiarities software COMPUTER. However, measurements of the radial run-out of the control valve with the help of sensors showed that its numerical value is within 1.5-2.5 μm in both X and Y coordinates and is slightly less in magnitude than the corresponding radial run-out when measuring the control valve at idle without load.
The tests of the CM runout without load at idle were carried out at various CM speeds: n = 10, 30, 70, 100, 160, 220, 300, 450, 600, 800, 1000, 1300, 2000 rpm (Fig. 7) ,
100 "200" 300 "400 500 600,~700" 8CO 900 "1000" 1100 "1200" 1300
Fig. 7. Runout of the spindle assembly at idle without load at various rotational speeds
Tests have shown that with an increase in the number of revolutions of the SHU, the radial runout increases monotonically up to n = 500-600 rpm, and then the rate of increase in the amplitude of the radial runout tends to some increase. The measurements were carried out with the cartridge in place.
The spindle assembly is a complex mechanical system consisting of several types of elastic elements: bearing, shaft, flanges, bushings, springs connected to each other, acting on each other and forming a single technical device in which complex processes take place, each of which can be described by its mathematical model.
The most significant models are elastic-deformational, dynamic, vibrational, tribological, thermal, fatigue failure.
The inputs of these models are the design and technological factors in the design and manufacture of the spindle, operating conditions. The output parameters of the models are stiffness, vibration, friction moment, speed, technical resource, heat resistance, fatigue life and other design parameters that characterize, among other things, the geometric accuracy of the machine and the accuracy of processing a part on it.
When testing the CS with the chuck removed with a fixed frequency of its rotation (n = 1000 1/min) and the load that was set by the hydraulic load device, the circular trajectory of the CS slightly expanded in its average diameter (an increase in Ax and Dn) and shifted in the direction of the load
%=n - p; (fig. 8) -
As a result of preliminary tests, the dependence of the amplitude of oscillations of the noise control on the frequency (AFC *) was also determined. The studies were carried out using a special analyzer of the vibration spectrum of the SK4-72 type. The signal came from the displacement sensors to the input of the analyzer, and the frequency response of the oscillations of the control room was plotted at various frequencies of its rotation.
Amplitudes A and B of the frequency response approximately correspond in frequency to the fluctuations in the noise from the stiffness fluctuation caused by the 18 rolling bearings of the front bearing assembly and the vibrations of the toothed drive belt.
When the machine is operating, relative fluctuations occur between the workpiece and the tool, causing certain processing errors. To reduce the level of these fluctuations and
to increase the stability of the dynamic system of the machine, the oscillation modes of the spindle assembly and the caliper are constructed. The form of oscillations is characterized by a set of ratios of displacements of individual oscillating
points of an elastic system to the displacement of any one point, taken at a certain point in time (taking into account the phase shift) to determine the frequency and direction of vibrations. The operating range of the oscillation frequency is usually in the range from 10 to 500 Hz.
To improve the measurement accuracy, it is desirable to use an excessive number of vibration measurement points. Vibrations are measured, as a rule, in 2--3 mutually perpendicular directions
Rice. 8. Circular trajectory of the spindle assembly under
load
The form of oscillations is measured by vibrometers, which can operate in the modes of measuring vibration displacement, vibration velocity and vibration acceleration. The first mode is used in the low-frequency region (up to 200 Hz), the second mode is preferred for frequencies (100-400 Hz), the third mode is used for higher frequency vibration measurement operating ranges.
The trajectory of any fixed point on the end of the spindle with a sufficiently large approximation reflects the cross-sectional shape of the workpiece. The degree of this approximation is determined, in addition, by the radial displacement of the tool mounted on the support with a transverse feed and trajectory deviations
caliper from rectilinear movement with longitudinal feed.
The data on the accuracy of the diametrical dimensions of the manufactured part were theoretically determined and experimentally verified (Fig. 9). It depends on the positioning accuracy D position of the cross feed drive, i.e. from the deviation of the actual position of the drive X1 from that specified by the program X with multiple two-way positioning
nii, Methods of mathematical statistics when testing drives are determined by X l and
Arithmetic mean values of the actuator position when positioning in
average ar!
Furthermore, the root mean square deviation of the actual drive position is determined.
X \u003d (X n + X ") / 2; For ■ - the size of the dispersion zone;
/ - ! X + X . | - dead zone that occurs when the drive is reversed
cross feed (Fig. 9).
The maximum value measured on the machine was 5.5 µm. The actual error from D when machining a part will depend on the machining diameter.
to D pos, microns
Rice. Fig. 9. Graph of errors of bilateral positioning of the turret head of the machine tool STP-125 at
transverse movement
1. A test and measurement setup for measuring the parameters of the circular trajectories of the spindle assembly of a CNC lathe has been developed and tested.
2. As a result of testing the STP-125 lathe, the results of the influence of external disturbing influences (cutting forces, spindle displacement) on the parameters of the circular trajectories of the spindle assembly were obtained.
3. An assessment of the influence of errors in the positioning of the transverse support on the accuracy of processing was carried out.
4. The ways and possibilities of diagnosing the spindle assembly and the support group of a CNC lathe are shown.
BIBLIOGRAPHY
1. VDI Richtlinien 2060, Standards for Balancing Rotating Solids. -1980.
2. GOST8-82E, “Machine sweeps for cutting. General requirements for accuracy testing. - M.: Publishing House of Standards, 1982. - 10 p.
3. Pronikov A. S. Program method for testing metal-cutting machines. - M.: Mashinostroenie, 1985. - 288 p.
4. Adaptive machine control. / Ed. Balakshin. - M.: Mashinostroenie, 1973. - 688 p.
5. Design and program testing of spindle units of metal-cutting machines / L.I. Vereina, V.V., Dodonov. - M.: VNIITEMR, 1991. - Issue. one.
6. Figatner A.M. Calculation and design of spindle units with rolling bearings for machine tools. - M.: NIIMASH, series S-1, 1971.
7. Calculation of high-speed spindle units / V.B. Balmont. - M.: VNIITEMR, 1987. - Ser. I. - Issue. 1. - 52 p.
Sorry for the delay in answering. I will try to make up for this with a complete description.
1. Swedish easy laser (D525, etc.)
The system is designed for various measurements and alignment of machines and mechanisms from small to large. Various types of measurements: from alignment of shafts and pulleys to geometric measurements (flatness, straightness, etc.). There is partial compensation of influence environment.
It is a set of various lasers and receivers with brackets for fixing them.
Cost from 450 tr.
2. American Excel Precision's 1100B
Metrological system designed for machine tool verification. the tasks are quite standard: perpendicularity, flatness, parallelism, etc. There is a partial compensation for the influence of the external environment.
Cost unknown (did not receive a response from the manufacturer)
It consists of 2 modules: a laser and a receiver.
Accuracy 0.0005-0.0002 mm/m depending on tasks
3. Swedish Fixturlaser Geometry System
Very similar in functionality and parameters to Easy Laser.
It is a set of various lasers and receivers with brackets for fixing them. There is a partial compensation for the influence of the environment.
Cost from 600 tr.
Accuracy 0.01-0.02 mm/m depending on tasks
4. Italian OPTODYNE MCV-400 (etc.)
System for laser calibration and verification of machines and mechanisms. Represent a set of laser, mirror modules and receivers. There are environmental compensations.
Cost from 800 tr.
Accuracy 0.001-0.002 mm/m depending on tasks.
5. Estonian LSP30
In fact, it is a system for laser geometric measurements. those. the interface of the control program is poor. It is a laser interferometer module and devices for measuring various geometric parameters: flatness, parallelism, etc. There is no compensation for the influence of the environment.
Cost from 500 tr.
Accuracy 0.00025-0.0025 mm/m depending on tasks.
6. American Hamar Laser L-743.
a system very similar to the Renishaw ML10 with all the ensuing consequences. Various modules for turning and receiving the beam.
There are environmental compensations.
Cost from 1.5 million rubles.
Accuracy 0.0001-0.0008 mm/m depending on tasks.
7. American API XD Laser Measurement Systems
One of the most powerful systems in terms of application and accuracy. The same modular system, but with 3 lasers and multiple detectors and rotators. There are environmental compensations.
Accuracy 0.00005-0.0025 mm/m depending on tasks and system design.
Durability is unknown.
8. American PINPINT's PLS-100
Such an American "Lego" for checking the machine. Laser and various modules for turning and receiving the beam. No environmental compensation.
Accuracy 0.001-0.01 mm/m depending on tasks and system design.
Durability is unknown.
Each system is characterized by a maximum working distance, but even in the simplest it is not less than 10m. (for my tasks it is quite enough).
There are representations in Russia at Easy Laser and, in my opinion, at API. When I talked with Estonians, it turned out that at that moment they themselves knowledgeable person in China, but it seems that he should have returned already.
It seems that's all for now.
P.S. Right now, the management has finally realized the need for such a system and seems to be ready to order something from the above but inexpensive.
Good day!
About cheap! The cost, as a rule, consists of the requirements for completion, at least Laser head + Optics for linear measurements + Software and will be issued about 700 thousand rubles. with vat., kit for operation in a thermally constant room, or with manual input of environmental parameters and will work up to 40 meters. Just for normal operation, you need an auto-compensation unit, fasteners, a tripod, and so on. Here the cost goes to the line of 1.3 lemons.
A complete set will come out for more than 4 lyama. I can guarantee that the cost of a similar set will not differ much from the manufacturer.
Even we have European prices, when importing from abroad, others can save only on customs, which is fraught with a warranty case.
Here slipped statements about bad work in the St. Petersburg representative office, simply the incoming information is not always correct and it is often necessary to clarify "what the client wants to receive as a result" for the correct offer. Well, trouble, the St. Petersburg office was closed. :(
On this complex equipment, all kinds of parts are made of metal, plexiglass, acrylic or plastic, wood. Their versatility lies in the fact that they are well suited for cross planing, the formation of the most complex surfaces, in particular, curved ones; carry out selections of the crest, tongue, folds, groove, slots and moldings.
Description of the machine
The standard equipment of the machine includes:
- heavy and powerful base;
- Desktop;
- , with the simultaneous presence of the spindle shaft;
- a set of several tools for cutting materials;
- front disc brake.
The design of machine tools today includes many important devices that ensure the accuracy of processing and ease of use. It is important to know about them in order to choose milling machine CNC was meaningful and correct.
Don't forget the spindle!
One of important qualities in the operation of the spindle shaft electric motor - the ability to rotate it smoothly and evenly. When assembling, bearings of the highest (accuracy class) are selected, and the collet must have increased tolerances for runout and size.
There are main types of spindle cooling systems:
- Liquid (it is based on the circulation of water or antifreeze in closed loop). One of the advantages is reliable heat dissipation. Among the disadvantages is a complex design, because the coolant must be placed in the tank.
- Air (such cooling consists in forcing air through slots-air intakes in the spindle cavity). Among the advantages of the system - compactness and simplicity. There is also a minus - filters, especially for equipment processing solid wood, must be changed often, they become contaminated with dust.
When choosing a spindle for a CNC machine, you should pay attention to its indicators indicated in the technical data sheet (power and speed during milling), which depend on how hard the materials are processed. For example, for sheet plywood, the required processing power is 800 W; over an array of hardwood, light metals - copper, brass and aluminum, plastic works more powerful machine - 1500 W; and the stone is processed at a power of 3000 - 4000 watts.
Now in equipment for milling, imported spindles are mainly used:
- Italian - high quality, running at high speed, with smooth rotation and low runout, mainly air-cooled and high price.
- Chinese has a solid cylindrical body, which is closed at the ends with covers, and bearing assemblies are used to hold the shafts. Among the advantages - the design has a sufficient level of rigidity and minimal vibration, insensitivity to the presence of chips and dust, affordability. Unfortunately, Chinese-made spindle models have a high probability of marriage, it can be difficult to replace bearings. And for models that have water cooling, there is a weak anti-corrosion resistance of internal parts.
Types of milling machines
Choosing such equipment, one must proceed from how it fits the purpose. The Russians have a choice:
- high-speed CNC automatic machines that cut and cut metals, process parts made of cardboard and wood, cope with two-layer plastic and acrylic, PVC, plexiglass and gypsum, natural stone - granite and marble;
- models (milling and engraving) working with sheets (maximum dimension 2000 x 4000 x 200 mm);
- engravers (from 2D modeling to 4D);
- narrow-profile machines that work with one kind of material - varieties of stone, plywood, wood, stainless steel or aluminum;
- small portable CNC models. For example, a milling machine model with "Desktop 3D" is used for milling printed circuit boards, MDF and processes products extremely accurately.
In the line of equipment series for professionals, you can give preference to vertical and horizontal machining centers with program control; large three-, four- and five-coordinate CNC milling engravers who produce in Taiwan.
They are considered quite reliable and buyable (after Germany and Japan - in third position). In addition, it is profitable to purchase them both for individuals and enterprises, due to the presence in Moscow and Tula service centers engaged in the supply of equipment, cutting tools, equipment adjustment and staff training.
ATTENTION: It is not difficult to distinguish a machine from Taiwan: it has a one-piece cast bed (the material of manufacture is Brazilian fine-grained cast iron). In addition, the machine is equipped with American or Japanese bearings, imported spindles.
And if the customer is looking for a high-precision jewelry machine, the best model for this is P 0403 from the manufacturer Vector.
furniture equipment
Woodworking and furniture manufacturing, workshops manufacturing windows, doors and facades will not be able to function without equipment of wide functionality - CNC woodworking machines.
In recent years, retro-style furniture has become fashionable - with elegant carved armrests, legs and other details. In this case, the technology of automated cutting of a pattern is used on a milling machine, on which numerical control is installed. It provides high precision and quality when complex wood milling is performed and a carved element is created.
With the help of such equipment, it is possible to establish the production of:
- wooden furniture facades and decorative consoles;
- balusters, curly legs and slotted elements;
- embedded carved details;
- symbols, figurines, figurines and frames of various shapes for paintings and mirrors.
Those who are on a budget may buy an inexpensive Chinese standard CNC router - CC-M1, especially for. In the manufacture of facades, engraving decor and bas-relief - usually a lot of dust. Therefore, choose the complete set, where there is a vacuum aspiration for dust absorption. This model has it.
What are the best milling machines? No one will give a definite answer. But there is still more trust in software working equipment. Each master has his own approach to choosing the right technique.
And the CNC router is good, which has higher accuracy, lower power consumption, more convenient to use, reliable in any working situation.
We can formulate three tips for the right choice:
- Specify in advance with company managers all the data about the model; materials with which the machine works. If there is a video, watch it. This will help you decide.
- Consult prior to purchase regarding the functionality of the equipment and the range of tasks performed. And the best option is to sign up for a demonstration of the CNC machine and do not be shy to ask questions during operation.
- When the desired model is selected, be careful at the time of purchase: check the purchased equipment for a complete set of nodes. There must be a block program control machine; cords with connectors of the appropriate configuration, and disks with software. Usually the software is installed by the specialists of the firm selling the machine during its adjustment.
Conclusion
Basically, we tried to help a person facing a choice. We figured out how to choose a milling machine (the thing is expensive, and will work with the owner for more than one year - with metal or wood). At least now there is plenty to choose from. I hope that readers will use this information to purchase a working tool.