How to sharpen a drill for metal and concrete with their hands
not require any evidence that the drill bit in the process losing the sharpness of the cutting part, that is, simply speaking, blunts.Blunt drill does not cause concern as long as is necessary.Here then suddenly it turns out that the work worn or blunt drill impossible.We can only regret that the time has not restored the geometry and size of the drill.This article will explain how to sharpen drills and drill with hard tipped for drilling concrete.
- How to sharpen drills type
- Video: Hand sharpening twist drills.Part - 1.
- Videos: Grinding twist drills.Part - 2.
- Video: Seam edges drill jumpers.Part - 3.
- Video: Sharpening drills - application.
- How to sharpen pobeditovoe drill tipped
- Video: Sharpening drills for punch.Part - 1.
- Video: Sharpening drills for punch.Part - 2.
How to sharpen drills type
About sharpening drills on a tree, you can not worry about, so the drill can work for many months or
for loss severity drill characteristic sharp creaking at the beginning of drilling.Not sharpened drill bit more time to produce heat and thus wear out faster than acute.
Sharpen drill can be on special machines or special tools.Naturally, if possible, it is preferable to do this special equipment.But in the home studio of these machines, usually not, so you have to use a conventional electric grinder with a stone.
main components of the twist drill.
Thus, we consider how to sharpen a drill for metal? type sharpening depends on the shape to be given to the rear surface of the drill and may be monoplanar, biplanar, conical, cylindrical and the screw.
sharpening drills conducted on the back side.Both tooth (pen) should sharpen drill exactly the same.Manually make it easy.It is also difficult to sustain the desired shape by hand rear face and the right rear corner.
1. odnoploskostnaya sharpening drill is characterized in that the rear surface of the pen is made in a single plane.Rear angle thus fluctuates between 28-30 °.Drill just puts a circle, so that the cutting portion was parallel circle and rotating without moving the drill sharpening.With such grinding during drilling can chip the cutting edges of the drill, which is a disadvantage of the sharpening process.This is the easiest way to hand sharpening, which can be used for fine drill diameter up to 3 mm.
2. Drill 3 mm in diameter, preferably sharpened conically.Manual without the skills to perform such grinding is difficult, but possible.Drill taken left hand on the working part as close as possible to the intake cone, and the right hand on the tail.The drill bit is pressed against the end face grinding stone and the cutting edge surface of the rear portion and sways slightly right hand, while creating on the rear surface of the tapered faces pen.Drill in the sharpening is not separated from the stone, hand movements are slow and smooth.For the second pen everything is repeated similarly.
summing the cutting edge of the drill to the grinding wheel.
swaying drill into the bottom and up again stalemate.
When sharpening you should try as much as possible to sustain the original shape of the rear surface of the factory, to save the desired rear corners.If sharpening is done correctly, the drilling diameter of 10 mm, it is quite sufficient.With a diameter of 10 mm above this sharpening can be improved, erode the front surface, as shown in the photo:
Podtochka front surface.
podtochki In what sense?By decreasing the rake angle and increase the angle of the cutting edge chipping resistance increases, which increases the life of the drill.Furthermore, the transverse width of the edge becomes smaller.Lateral edge drill, and scrapes the metal in the central portion of the hole.The second figure clearly shows that it is shortened to facilitate drilling.
for small drills with the selected clearance angle can be further erode the back surface.Drill while less than a third in the hole drilling the rear surface.See. Photo:
Podtochka rear surface.
in production environments after sharpening usually is lapping, which smooths the surface, removing minor nicks.The drill, which made lapping less wear than a sharpened drill bit.If possible, it is sure to do fine-tuning.
need to use for finishing grinding round stones of green silicon carbide (Grade 63C, granularity 5-6, the hardness of the M3-CM1) elastic wheels and CBN wheels LO (grain 6-8) on bakelite bond.
Below we present to your attention an excellent selection of video tutorials are seeing you can just sharpen their drills.
Video: Hand sharpening twist drills.Part - 1.
Videos: Grinding twist drills.Part - 2.
Video: Seam edges drill jumpers.Part - 3.
Video: Sharpening drills - application.
How to sharpen pobeditovoe drill tipped
pobeditovye drill can also be blunt.Blunt drill overheats during bad drill and makes a lot of squealing sound.Of course, you can change the drill, bought new, but it is better to save money and hone his own hands.To do this you will need sharpening machine (electric sharpener) with a diamond stone and coolant.Average emery stone for sharpening drill bits pobedita not do.Before proceeding to the sharpening, make sure that it is possible in principle.To do this, measure the height of the cutting part of the tool.If the height of the cutting part of the tool, ie. E. About 10 mm soldering sharpening possible.
Do not forget: the harder the material, the lower speed should be sharpening.The angular velocity (the number of revolutions of the rotation of the stone) at sharpening pobeditovye drills should be reduced, regardless of which tool is used for sharpening.
Sharpening drill runs short touches drill emery stone.Pobeditovye drill sharpened quickly, usually there you just need a little tweak to lick the edges, so you should carefully monitor the process in order not to cut off too much with the working surface of the drill pobeditovye.
drills tipped with sharpened similarly recommended a simple drills of small diameter, ie,to do grinding the rear surface of the flat.This should sharpen the rear surface as shown in the photo, stachivaya drill until the soldering:
Honed to drill for soldering.
desirable to erode the front surface.If soldering is already Stoch to the drills, without podtochki simply can not do as a soft metal, cutting edge goes to the front surface side.The front surface simultaneously eroded so that the thickness center of the soldering becomes smaller.
Podtochka soldering from the front surface.
During the sharpening drills try to be precise and closely monitor the fact that his side were cutting the same size.If this can not be achieved, then the shift of the center spine will necessarily lead to the fact that the drill hole is enlarged and uneven.Regardless of the device on which the sharpening, it is necessary to control the ratio of the front and rear corners of the cutting edge in the direction of rotation.Another rule that should be followed to properly sharpen drill on concrete: the harder the material, the greater the sharpening angle.For pobedita it is 170 degrees.
During the sharpening of the drill can not be allowed heating becausemay cause cracks and delamination may carbide inserts.To prevent this, the drill bit must be cooled periodically with fluid.For cooling, you can use plain water.
We offer a selection of movies to look for sharpening drills pobeditovymi tipped.
Video: Sharpening drills for punch.Part - 1.
Video: Sharpening drills for punch.Part - 2.
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