sliding panel saw

I Think in your case is better suited sliding panel saw STS-3200. Compared to Bernardo S-3000L he is much bigger. The machine is almost completely configured at the factory, the main carriage is configured. We have a competent Adjuster to find problematic, so it’s important to me. The machine was given a set of saws.

Knives sliding panel saw machine

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The choice of drill bits for metal

let’s Start with the fact that metal drills are made of HSS high-speed steel (R6M5, for example the best Soviet or Р6М5Ф8) and hard alloy (in common WIN), when using carbide drills necessary cooling and the desired minimum axial vibration. In my memory, drill ø 5 mm can withstand a deflection of the axis at 0.3 mm then destroyed. Brought from HSS for metal less critical of the coolant and the machine. Therefore, in the case of use of metal drills for CNC machine better to use a drill of a hard alloy-they are much heavier and darker if uncoated. For the machine without the CNC to use a drill bit of high speed alloy.


the Geometric parameters of metal drills

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the Influence of the geometry of drill bits for metal cutting process

Geometry of drill bits for metal


Angle of elevation of the screw groove of the drill

When you increase the angle of the helix

effective power decreases

decreases the rigidity of the drill.

Improved chip removal


Length of the working part of drill

the working part of the auger facilitates the removal of chips and coolant. Too long working part reduces the stiffness of the structure, and too short degrades the chip and could cause damage to the instrument.


the apex Angle of drill

Optimum choice of the angle depends on the properties of the processed material and affects the value of axial forces.


reduced axial cutting force

processing of the material with low hardness, aluminum


the Increase in the resistance of axial cutting force

the Increase in the probability of the formation of agnail

Machining of workpieces with high hardness

the Increase in torque


the Width of the ribbon drill

Ribbons drills serve as guides. A smooth blend of the back of the tooth and the ribbon reduces the stress concentration caused by the drilling process.


the reduced friction between the drill and the workpiece

the Increase in drill withdrawal


the reduced friction between the drill and the workpiece

Reduction of drill withdrawal


Width drill

the hardness of the drill depends on the width of the jumper. For effective centering when drilling a sufcient width of the jumper. At the same time, a broad jumper increases the cutting forces. The width of the cutting edge more than 50% defines the axial component cutting forces.


Reduction of cutting force

the Decrease in the rigidity of the drill



the Increase of cutting force

increase the rigidity of the drill

a Bad chip

Machining of workpieces with high hardness


the Use of coolant when working metal drill bit

Application of cutting fluid to drill bits for metal

•monitor sufficient coolant to the cutting zone

•Normal pressure : 3~5 kg/cm2, the coolant flow : 2-5 l/min

Steps to increase the life of drill bits for metal


To increase the lifetime need reface of the drill even at small chips or wear and tear.

the Total size of the shear layer at regrinding the rear surface must not exceed 1.5 mm.

the cracks eliminates the possibility of sharpening.

When you drill sharpening it is recommended to use grinding machines with CNC.


the Process of sharpening drills on metal

Sharpening drill bits for metal

to Determine the need for regrinding.
to Check for chipping and wear.
If the chip is large enough to remove the rough sharpening.

Operation sharpening
to Install and secure workpiece in Chuck.
Chuck Runout should not exceed 0.02 mm.

Remove the bumps with grinding wheel
Please note the deviation of the axis of the jumper and the drill axis must not exceed 0,03 — 0,08 mm
the drill Axis must be tilted at 343 — 40= relative to a tangent of the grinding wheel

Sharpening drill bits for metal

Final sharpening is done with diamond needle files. Initially you have to handle the plane throughout the length of the cutting edge. Then finally finish using diamond paste.

Milling cutter for metal

Technical process milling is the most common methods of processing metals, it is often only found turning.



Selection of cutters for the metal is carried out according to the criteria of workpiece material of the part

the hardness of the processed surface details

the complexity of the geometry of metal parts

the accuracy of the processed surface details

milling parts appear processes hindering the treatment process

depending on properties of the processed material during the cutting process appears chip shrinkage, which leads to frizz chips and difficulty of the treatment process

Processing soft materials associated with the appearance on the cutting edge of the cutter for metal.

Heat treated surface and cutter for metal when cutting

the Most common cutters for metal




Shaped cutters

Cutter for machining T-shaped grooves


Briefly describe the main parameters of the mill metal

specifications of end mills for metal

Geometrical parameters of milling cutter for metal

Disc cutter

Disc cutter for metal used for cutting various lengths of metal or to create grooves of a given thickness and depth, which is very convenient when using it in mass production. The cutting disc cutter for metal is usually divided into 3 kinds, this is a fine teeth, with medium tooth and krupnooptovye.

modular disc Cutter

side and face Cutters are made of modular sets of numbers for each module, these cutters cut into conical or cylindrical, helical or spur wheels.


hob has a profile profiled screw with cutting teeth. They are used for the manufacture of gear wheels. The method of milling of gears using the hob for a very long time is widespread in the industry due to its versatility, very high performance and accuracy when obrabotke. The same mill one module get wheels with different numbers of teeth. The process of ubonratana hobs similar to the process of meshing two toothed wheels with their reboot, hob and the wheel when processing revolve around the axis, and the axis of the wheel is the movement of the caliper of the machine.

T-shaped cutters

engineering is often obrabatyvat T-shaped machining grooves with groove sizes from 10 — 50 mm. is Optimal for getting them to use a T-bolt cutters sootvetstvuyuschim profile. Udobstvo their use is especially important when milling with a cutter, the upper surface of the groove, often the getting of this size is not physically possible because of the possibilities of cutting equipment.

slot drills

slot drills used for milling keyways and grooves in the products of steel and cast iron. Slot drills are manufactured from high speed steel and hard alloy.

radius End mills

For more complex curved surfaces on a processed milling parts,such as blade profiles of turbine blades or stamps, use the end radius of the cutter. Depending on the complexity of the workpiece, material and machining conditions these cutters have high requirements to be considered when selecting a cutting tool for metal. For example,to improve output of chips when machining a blind while deep wells it is necessary to increase the angle of helix of the cutter. To reduce vibration when cutting the teeth of the cutter are fitted asymmetrically relative to its axis. To work the cutter in the axial direction as when drilling in the center of the cutter at its end, make a small jumper. Getting burnished transitions of small radius may conical radius end mills; the angle of the cone depends on the design parameters of the processed surfaces and conditions provide the necessary stiffness;.

Calculation of main technical parameters of milling metals

the Calculation of the main technical parameters of milling metal


Recommendations for selecting cutting conditions select for one or more of the processed materials. When calculating the mode of machining cutters for other materials correction factors are applied.

Effect of number of teeth of milling cutters for metal on the main characteristics of cutting

the Difference between the milling of four and six tooth cutters for metal

cross Section of the cutter on metallo

Low speed metal cutting due to the large depth of cut and low feed

the cross-Section cutters for metal, 4-z

High speed metal cutting due to the small depth of cut and high feed

six tooth cutter is less wear for the same performance with four tooth cutter for metal

Cross cutter metal 6-z

Technological parameters of the milling cutters for metal, calculated as follows

cutting Speed

Calculation of filing when milling metal

the Basic formula for the calculation of process parameters for end milling metal with spherical ends

In some cases in mass production in milling cutters for metal cutting are carried out with the help of interchangeable plates

Inserts for milling metal

Cutters are highly economical tool due to the use of plates with double-sided geometry.

Negative geometry cutters for metal contributes to the durability of this tool.

Sometimes cutters for metal are combined mounting of SMP is made by means of a screw and wedge.


cooling System cutters for metalcoolant

the Use of coolant improves chip evacuation from the cutting zone and cools the tool. The cooling system is supplied through the case of the cutter the cutting edges.

Recommendations and features stainless steel treatment

General characteristics stainless steel

Stainless steel has a high corrosion resistance.

the High anti-corrosion properties due to the presence in it of alloying elements on the basis of chromium. Stainless steel has a low coefficient of machinability, which decreases in proportion to the increase in alloying elements such as Nickel and titanium

Stainless steel

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Drill sharpening

When sharpening drill bits, special attention should be paid to the angle at the vertex, axis rear angle, length of the transverse cutting edge back taper and the front corner of Potocki transverse cutting edge.

the Thickness a and width b of the cut when drilling

Liane of the apex angle 2φ of the drill when grinding is caused by the change of thickness a and width b of the cut when drilling with increasing angle 2φ, increased thickness and reduced width of cut.

the Back angle α is an important design element of the drill to which you should pay attention when sharpening drill bits. Its magnitude has a significant impact on the work of the friction forces and, consequently, the temperature in the cutting zone. When the temperature in the cutting zone of the processed material begins to actively absorb atmospheric gases, resulting in higher strength and lower ductility by altering the cutting process and the resulting inhomogeneity of the surface quality. The increase in the angle α when sharpening drill bits reduces friction, but reduces the rigidity, which leads to vibration of the drill and reduce the accuracy of the drilling.

clearance angle

Rear angle on top of drill bits for metal forming on the machine for sharpening of drills conical or plane sharpening. Stocktake when the conical surface is a smooth decrease in the rear corner. With a dual plane sharpening of the drill point are ground to a straight plane, to reduce the friction of the rear surface when drilling on the surface additionally remove a layer of material at an angle of 20-25°.

Bevel sharpening and sharpening the two-plane rear surface of the drill point

Transverse cutting edge

Transverse cutting edge worsens the process of penetration of the drill into the detail so its length reduces with the help of Potocki on the machine when sharpening drill bits. Reduce the length of the transverse cutting edge reduces the axial component of force by 25% compared to a drill without Potocki. Excessive decrease in the length of the transverse cutting edge leads to an increase in vibrations of the drill during cutting. The gun nose of the transverse cutting edges of drills can be of four types.

Shape Potocki transverse cutting edge:form A, form b, form C, circular gun nose

Form of Potocki

When you gun nose form A transverse cutting edge is undermined when sharpening drill circle with the formation of the concave curved surface. The gun nose shape In allows to undermine a transverse cutting edge with the grinding of the front surface along the straight path, aligning a cutting edge of the drill. The gun nose shape With saps transverse cutting edge with the outlet at an angle to the front surface of the tool. Circular gun nose undermines the transverse cutting edge with the formation of a convex curved surface.


twist drill bit has a small amount of the front angle γ in points at the transverse cutting edge, which impairs the cutting process, the Central part of the drill. Allows the gun nose to the front corner of the transverse cutting edge. Excessive increase in the angle γ larger than the angle of inclination of the helical grooves, increases narezanie surface Potocki the front surface of the drill forming a hole with radius R. The hole prevents a descent chip and contributes to its sticking to the surface of Potocki that leads to a reduction in processing accuracy when cutting.

 the Formation of holes when sharpening drill bits with rake angle of Potocki more than the front groove angle

Machine for sharpening drills

Drill begins to wear out from the periphery of the cutting edge, due to the fact that on the periphery of the tool cutting speed is much more than the tip, so there is a maximum temperature, and heat when drilling from the corner cutting edge is difficult. Then abrade the rear surface of the tip of the drill. On the rear surface of the risks coming from the cutting edge. When wear of the drill, the risks are merged into one continuous strip along the entire cutting edge. As soon as possible to begin the process of regrinding the drill to the grinding machine to reduce the removable layer, and extend the life of the tool. When sharpening is necessary as to follow the shape of the sharpening of drill bits to maintain the desired cutting properties after sharpening.

model sharpening machine drills

drill Sharpening can be performed manually on the emery or grinding machine.

Machines for sharpening drills, no matter the material are domestic and industrial. Domestic grinding machines is quite compact and well suited for home work.

industrial machine for grinding drills, you can do the following

Surgery performed on the industrial machine for sharpening drills

suitable For home machines for sharpening drill bits the type of Drill Doctor and its Chinese counterparts. Basic sharpening drill bits on the machine is accurate alignment of the axis of the drill in the Chuck.

I Think you need to clarify that a fine drill bit with a diameter of 2-3 mm is good to sharpen fails because the accuracy of the machine not designed for it. In this case, you will need a special machine.

don’t forget that the cutting material of the drill does not tolerate overheating. When regrinding solid carbide materials crack, and high speed lose their hardness. When regrinding on the grinding machine need often to cool the drill with water or air, if the drill was steaming better it cool slightly at room temperature.

All of the machine for sharpening drills have design

the Main part of the machine for sharpening of drills consists of a fixed base and a removable tool holder with holes for drills of different diameter.

a Device for sharpening drill bits: 1 - rail; 2 - auger; 3 - emery wheel; 4 - base; 5 - holder
To the base at an angle of 30-32 degrees (angle dependent on the angle of drill point) is attached to the rail with a beveled side face with a 25-30° angle. The rail guides to the desired angle tool holder with sharpening drill relative to the grinding wheel. One of the sidewalls of the holder has an angle of 60-65°. The sidewall of the tool holder is pressed against the rail at the base that provides the front sharpening angle of the drill with the desired geometrical parameters on the machine for sharpening drills.

Please note that the cutting edges after sharpening on the drill sharpening machine drill length should be equal, and inclined at the same angle to the drill axis. The size of the transverse cutting edge at the correct sharpening of the drill in the machine should not be exceed 0.5 mm for drills with diameter less than 8 mm, if more it needs to be up to 1.4 mm.

drill Sharpening on the machine BSM 20

Sharpening drill bits

Hold the drill with the screw. Lightly grip the drill, it must turn in the prism. Now install the main cutting edge drill in the direction of shown in the figure. With the screw-tighten the lens.

prism is clamped in it with the drill mounted to the stand mount of the prism and clamped and screw. Scale is set right angle drill (standard 118° angle) Desk clamped arm.

-left scale: the stand is given to the left
-right scale: the stand is given to the right

by feeding the prism and flow of the engine position the drill before grinding around. Carefully setting the flow of the prism, at the same time turn it and sharpen the first cutting edge of the drill

gun nose drill

gun nose drill

Drill bit fixedly clamped in the prism.
the Mounting of the prism to fix the hole .
Rack mounting the prism set according to a scale position.

Using flow prism and the pitch of the engine supplied drill bit to the grinding circle and podnachivaet a jumper wire between the transverse cutting edges of the drill. Remember the feed value of the prism and attach the drill bit ago (about 3 turns). The flow of engine not touch.
Turn the prism for 180° and repeat all for the other side of the drill.

Additionally posted a video on sharpening drill bits on the machine.

The types and characteristics of reamers for metal

a Reamer is a cutting tool used for reaming of holes with high precision. Accuracy class scan is much higher than that of conventional drill bits for metal, so she adjusted the hole after drilling, if you need higher precision.

a drill with a diameter of 9 mm, and the real get the holes equal to 9.4 mm, so use a reamer to get a perfect hole with a diameter of 10 mm.

View scan

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