Vladimir Zyibin

Saved 7/10/18 7:43 AM from samodelkin

8-2 Заточка спиральных свёрл  See details »

 
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  • 00:00: [music] Hello ladies and gentlemen colleagues craftsmen and craftsmen skill correctly sharpen drills on a grindstone is one of the indicators qualifications of the representatives of a large a number of technical professions, if you are
  • 00:30: manual sharpening of a drill bit yet do not own but have at your disposal grinders are full of the desire for grinding business should be mastered with the management your machine easier grindstone in an acceptable condition for this work in This will help you a series of video lessons about work on grinding machines where you also familiar with the safety and concomitant terminology that I I will use it under lighting current topic
  • 01:01: Standard spiral drills consist of connected by special welding two main parts of the working part material that is hardened tool steel and shank made of non-hardened steel grade 45 or 40x form of shanks in standard drills can be cylindrical and conic not round limb to conical
  • 01:32: shank ah called paw in turn, the working part of the drill also divided into two parts on cutting and the calibrated cutting or western part consists of the following elements 2 cutting edges The rear surfaces as well as the edge in the intersection of the rear surfaces of which called the edge of the bridge and more often simply the jumper is actually the actual
  • 02:04: jumper This is the minimum layer of material between groove drills all along their length . located in the middle of the edge of the lintel is the top of the drill, or rather its the central peak intersection points of the rear surface with groove and ribbon surfaces are considered to be lateral peaks the location of the cutting edges is relatively axis of the drill is symmetrical
  • 02:35: and the angle between the edges standard value of 118 118 degrees is called the vertex angle angle between edge of jumper and cutting edge edge dependent on the angle of inclination of the rear Surface 55 is standardly degrees per spiral calibrated there are two ribbons bounded on one side chips outgoing grooves and on the other hand
  • 03:06: back representing the size of the drill distance between ribbons near the cutting part by a few hundredths millimeter more the theme of the shank this is the so-called inverse conicity on ribbons angle of inclination of the helix relative to the axis rotation of metal drills can slightly different for drilling Solid steels and cast iron are preferred Drills with a smaller angle of inclination of the spiral
  • 03:37: for less solid color materials metal alloys as well as stainless steel and titanium best drilling result is provided with a spiral with a large angle of inclination polishing the calibrating part is advantageous differ from those not polished by the best chips proceeding from the direction of the turns of the spiral drills are divided into right and left designed for drilling on straight lines and reverse revolutions respectively in
  • 04:09: depending on the ratio of diameter and lengths spiral drills can refer to the short medium and long series on and the best performance characteristics Have a short series of drills A drill must be marked with mark the steel of the working part and drill size is equal to the minimum the diameter of the hole formed by it
  • 04:40: marking is applied to the surface and cylindrical shanks or section between the working part and a conical shank so called the cervix less often the marking may be applied to paw conical shank more detailed parameters of spiral drills can be found from state standard documents The task outside the drill is to
  • 05:12: sharpening cutting edges due to turning on the back The surfaces of this form and the location of the machined cutting edges and the rear surfaces must meet the drill will be crash into the material if with the surface cutting only the jumper and Cutting edges and all other points on the The rear surfaces are on small but at a distance from the surface
  • 05:42: Cutting for this, both back surfaces when considering the longitudinal section must have generators with form identical curves or broken lines located relative to the plane perpendicular to the axis of the drill under a conditional angle of 7 to 10 degrees this is the first and most important condition of sharpening without the drilling will not be performed
  • 06:12: as such, the standard angle at the top that is 116 118 degrees in special tasks drilling can be changed to a large and The smaller side in general is how but pleases regardless from the magnitude of the angle at the top of it location relative to drill axis should be as symmetric as possible It should be understood that when drilling cutters
  • 06:42: The edges do not rotate around the axis of the body drill but around the top. which is located in middle rib jumper if the angle is symmetric and u. tops Drill pines equal the drilling diameter will be equal to the nominal size drills with minimal errors at asymmetry of the angle at the vertex yoga and metric. from the drill axis to deflect to a certain
  • 07:13: distance resulting in diameter drilling will be great twice the value of this distance In addition, power and heat loads cutting edges that will be different reduces the resistance of the drill bit the tool life is measured time of its work between points and so along with the first condition on the back angle of cut ensuring symmetry angle at the vertex relative to the axis of the drill
  • 07:45: is the second condition but no longer just sharpening a size on appropriate sharpening the third condition is the size of the correct ones The sharpening consists in the fact that the cutting edges Drills must be maximized identical in length and shape of lines when inequality edge lengths will The deviation of the vertex point from the drill axis and the drilling diameter is greater
  • 08:15: nominal by twice the amount of this deviation with the size of the inequality of cutting Edge but is equal for the unequal form of their line The power and thermal load on them will be different because of what the durability of the drill will decrease the width of the grinding wheel has a margin exceeds the length of the cutting edge processed drill to ensure
  • 08:46: straightness of cutting edges it is necessary that similar there was a straight line for the generator peripheral surface grinding circle if this is not for visual assessment the circle is subject to revision. the first stage of mastering the sharpening of a drill is the development of movements and gaining the skill when grinding on abrasive wheel of the rear surfaces with the goal of giving them the same
  • 09:16: curvilinear shape and slope so that when sharpening between cutting edges turned out an angle with a rounded 120 degree of drill axis should be placed relative to the line machining the surface of a circle under angle of 60 degrees if you put a marker on the pod The line under this angle is visually combining the lateral surface You can hold the drill bit with the grinding in an angular position close
  • 09:47: The desired landmark for the angle of the apply also over the additional glass which is superimposed a real horizontal protective screen on the machine that was turned off, I demonstrate the right location hands and drills the drill is oriented laterally parallel to the panty lies on the index finger or fingers who rely on the same handmaid
  • 10:17: The drill is pressed on top by a large finger fingers of the second hand hold the drill bit for the shank and ensure its movement up-down shifts left-right Rotations on the axis and fixation in the desired position in the initial position of the body of the drill is horizontally if you look On the side, it will be seen that in horizontal position drill radius circle is already ready to betray the back
  • 10:48: the desired slope and that from working position to observe happening both on top and side beginners can get a side-view mirror that was presented in the additional video tutorial about equipping that slit machine while maintaining the angular position of the drill bit relative to the line and horizon it is also necessary to expose its angular position on its own axis, it must be so as to make sure that not the cutting edge
  • 11:19: It was horizontal and not only in initial position but also for of the entire period of turning of the back surface drill motion when sharpening the following gently bring the cutting edge to the Abrasive circle before touching with it is easy Press and immediately start smoothly change the slope of the drill without loosening pressing to the end of the passage the drill is returned in the starting position and its rotation by 180
  • 11:51: degrees without changing the angular position relative to the control line the drill is rotated by fingers with the hands and hands as it is maybe the position does not change the 2 back the surface is treated similarly to 1 It is important that the clamping force grinding both rear surfaces was as similar as possible for people who have left hand is better
  • 12:22: than the right You can exchange hand roles when sharpening but observance of all other rules we proceed to the working hint of the rear surface of the hand hold the drill in the initial position without tension elbows easily pressed to the waistband exposed horizontally cutting edge is brought to the surface of the circle to touch with the clamping to The surface of the circle is fed up and then retracted to its original position
  • 12:53: the right hand preserves the immovability of a fingers of the left hand while saving angular position of the drill with respect to features on the pod and horizon rotate it 180 degrees to 2 of the cutting edge in horizontal position if it is obvious that one cutting edge It is necessary to grind more than the second and and the ray hone several times without changing pressing force periodically drill
  • 13:24: cooled by immersion in a container with water to check the shape and location of about the chiseled rear surfaces, you can she made use of such adaptations or the simplest pattern that is cut out from sheet material to presented sketch are not specified in general dimensions are arbitrary and depend on Drill sizes if the result is sharp
  • 13:56: you did not arrange her process should be repeated the length of the drill is sufficient for this symmetry and equality of cutting Edge A special attention should not be paid to since this will be the task of the second the stage of learning to develop automatism when turning on the back surfaces beginners are required by observations from 15 minutes to an hour after which you can go on to the second stage [music]
  • 14:30: ensure that the required symmetry of the cutting Edge With respect to the axis of the drill, such self-made fixtures it is established by the positing surface at the required angle to The surface of the circle is then pressed coarse yoke with clamp if you do not have desire or
  • 15:02: the possibility of such an adaptation You can use the corners of the shelf of 30 40 millimeters and a length of about 80 the corner is set on the pod that its vertically standing positioning a shelf was relatively processing the surface of the circle at an angle equal to half the angle at the top the bit to be sharpened for a given settings are still the same 60 degrees lying on the fingers and located in
  • 15:34: horizontal position drill cuddles to based on fidelity angles contact with the surface of the base only tapes and number of points contact information there must be at least two of either Cutting edges of the drill are set as laid horizontally and boldly takes the starting position backing performed with a constant lung
  • 16:05: clamp the drill to the corner by the rules and in the order that was is shown and was announced earlier after turning the drill bit on 180 degrees and then grinding 2 back surface with the same clamp ha basis rather accurate symmetry of the angle at the top of the drill will be automatic so the second condition is the size on appropriate grinding done
  • 16:36: It remains to provide 3 conditions for equality lengths of cutting edges with an approximate accuracy their equality can be controlled by eye The estimating equality of the reflection on edges are eliminated by overlapping light palm control and cutting edges on the Equity with greater accuracy will help the previously mentioned device his rotary ruler is put on
  • 17:06: relation to the fixed ruler under right angle and The frame is set so that the distance between the reference point on it and fixed ruler equal to the radius of the drill bit the drill is pressed against the surface fixed ruler and by comparison position of the top of the drill with respect to control point you are a shorter cutting extra edge on subject. A shorter edge can also be
  • 17:39: to reveal by comparative measurements calipers we for precise correction of cutting dimensions edges and also with the so-called corrections of their severity it is advisable not to grind all the back surface but only conditionally flat a ribbon on it that is realized by easy touch back surface and with round in the horizontal position drill methods of sharpening drills with the formation of their surfaces in the form of two conditional
  • 18:11: planes will be illuminated in additional lessons the length of the edge of the jumper at the drill of one diameter, including new ones, can be relatively larger or smaller This greatly affects the drilling process The fact is that the length of the edge The smaller the smaller the jumper resistance when cutting a drill in material
  • 18:42: This is especially true representation with the same manual force at performance drills drill with a shortened loudspeaker lintel much higher the production of new swirls The jumpers are sewn on special machine tools coarse - grained diamond circles on a metal bundle with intensive cooling as a result of cutting part acquires geometry which without special equipment and
  • 19:12: it is difficult to reproduce manually so I'll talk about the techniques shortening the brittle bridge with using conventional grinders equipped with circles of electrocorundum reduction of the length and edge of the jumper is realized at the expense of alternate plunging into the jumper from the side of the channels grinding wheel edges radius rounding the edge of the circle should be opportunities in the least this way
  • 19:42: You can shorten the edges of the jumpers us true in size over three millimeters The starting position of the drill during execution of the operation, the following jumper edge to be shortened touches one side of the edge of the circle a The second contact point of the drill bit with the peripheral surface of the circle is at a certain point on the edge of it the back surface angle of the drill axis relative to the end of the circle
  • 20:13: must be in the range from 0 to 10 degrees the harder the material , the smaller the angle fixed on the pod emphasis will help reproduce this angular position after turning the drill 180 degrees angle between the axis of the drill body and the upper surface should be on visual assessment of approximately 45 degree if you have a side view mirror
  • 20:47: it will help to control this angle and behind the work item Also on the body of the drill can be applied Opposite to placed tags that being connected to a fixed guide on the pantry will help repeated inserting a drill under the desired angle to it and when the drill is turned on is set to the starting position for which is used in mostly the left hand with the right hand easy dumping of landfills
  • 21:18: kuga with direction of force in parallel edge webs edge wine are shortened by about a third with each hand but with a necessarily symmetrical the location of the frames as and how much this knock back of the drill values ​​is not It has it will not be superfluous to do an interim Location control surfaces for this need to grind interrupt and after control
  • 21:49: set in the same position and continue Started and if necessary with a correction directions to interrupt us faithful small Diameter knitting with an edge of a circle occurs very quickly and often turns out to be excessive then the drill bit processed on one surface in the usual manner until the edge is formed jumpers with the required length and to reduce the speed of grinding The jumpers on the small-sized drills of these
  • 22:19: it is better to perform the operation on the edge diamond circle when this operation you can confidently work out refrain from using any focus and landmark on the comets final conclusion and size to us The alignment of the grinding is done by test drilling The depth is equal to the diameter for a very small filing
  • 22:49: both edges must cut the same material layer the diameter of the drilled hole is not must exceed The nominal size of the drill bit is more than tolerance for a given size by 11 will qualify for if the production of grinding machines are used collectively and for different jobs, that is, when one and the same circle is the pelvis.
  • 23:19: scraps then grind the welding along side with this precise tool sharpening almost impossible to get out of this situation a simple group of artisans with equally correct concept sharpening it is necessary to turn to the the requirement to provide them with two machine- tool throwers and appropriate abrasive tools to them and stressed dody asking for a to demand in accordance with
  • 23:50: the condition of the collective agreement and that access to the equipped grindstone was only initiative group machine tools should be given to stat switch lock checked long-term practice result It is absolutely positive that over time, any practitioner- based sharpening of a drill and other tools without devices However, when the adaptation to machines and set up for. will still be
  • 24:22: get and be more accurate and faster therefore rational from time to time say for the thickness of an hour that is using one-time sharpen the machine tool tools with a margin for the future about other ways of sharpening a drill in including special appointments you can learn from the additional lessons I think that are reported in this lesson information will be useful to you
  • 24:52: healthy gentlemen creators and good-bye [music]