K1C Hole Driller  – used for putting in start holes for WEDM, drilling exotic materials, angular drilling and removing broken tooling to a maximum hole depth of 200mm (Styluses range from 0.25 – 3.0mm) PCML current styluses 0.3, 0.6, 0.8, 1.2, 1.5, 2.0, 2.4, 3.0mm. Small Hole EDM. Thus, a uniform slot that is several feet long, and extends entirely across a workpiece, can be formed, according to the present invention, one short blind hole at a time. 1, laterally across the width of a cylindrical tube workpiece with a guide-wire assembly of the present invention in position to form a slot in the wall of the tube. The wire is generally received in the shallow groove to a depth that is less than the radius of the wire, so the longitudinal axis of the shallow groove, measured at the outer edge of the track, is generally offset from the longitudinal axis of the wire towards the body of the track by an amount that is from approximately one-eighth to three-quarters of the radius of the wire. ). Wire EDM. An elongated generally cylindrical workpiece 122 is adapted to be mounted in a “V” shaped groove 128 that extends longitudinally of the table 120. The generally “V” shaped configuration of the annular groove in guide wheel 96 within which wire 94 rides accommodates various diameter wires. Wire. Such cuts would be typical of the results achieved by using moderate power settings. According to conventional wire EDM technology, the cutting wheels are often submerged in dionized water. [0071] The cutting wheels according to the present invention can be ganged in series or in parallel. [0042] FIG. 24 and 25 illustrate the formation of a blind hole in the form of blind slot 194 in a cylindrical workpiece 192. : 0.3 - 3.0mm Slot 186 can be formed by conventional EDM procedures where a continuous EDM wire extends completely across and beyond the edges of the workpiece 184. 1 and 3. This permits the groove to be formed in the blank with conventional machining operations. EDM 102: An Engineer and Toolmaker’s guide to EDM Machining. [0053] FIG. The track member has a length measured in a direction generally normal to the arcuate groove and the longitudinal axis of the wire. 2 is a cross-sectional view of a cutting wheel with a continuous wire EDM electrode mounted in an annular wire retention element on a wire guide structure according to the present invention. [0004] Continuous wire EDM machines are well known. The use of the term “radial” is not intended to suggest that the arc that is formed by the outer periphery of the track is necessarily a part of a perfect circle. Angled drilling is available. The finish of the wire holding structure also has an impact on the retentive nature of the structure. Such erosion occurs even though the gaps between the walls of the cut and the walls of the track are greater than gap between the wire and the walls of the cut because debris collects in one area to the extent that a conductive path is formed between the cut and the track. The ring 44 acts as a blade that carries the wire 34 into the cut. We have invested in four CNC Wire EDMs offering a 0.05mm – 3.0mm electrode diameter and a maximum taper angle of ±20° (generated using U and V Axis). A scrap workpiece is selected. Wire Correction Angle POWER-EXPERT Wire breakage prevention on parts with variable heights This smart module continually analyz-es the machining conditions and adapts the power according to the geometry modifications. [0018] The present invention enjoys utility in embodiments where larger diameter EDM wires are to be employed. 21 is a cross-sectional view taken along line 21-21 in FIG. The longitudinal axis of the groove generally parallels that of the EDM wire where they are engaged. For example, the guide rollers 18 and 20 in FIG. For example, diamond or square cross-sections can be employed. 1 was employed to form a 0.010 inch wide slot in the wall of a tubular workpiece. Wire EDM is used primarily for shapes cut shapes through a selected part or assembly. Multi-channel electrodes for blind-hole drilling. The use of a track to carry an EDM wire into a workpiece while rotating the workpiece about an axes that extends generally normal to the longitudinal axes of the EDM wire in the cutting zone erodes the workpiece in a pattern that is dictated by the relationship between the positions of the axes of rotation of the workpiece and the cutting zone. [0038] FIG. Blind slot 190 can not be formed by an EDM wire extending entirely across workpiece 188. 8.2 [3], is a three-axis hybrid machining center which combines micromilling, turning, EDM, wire EDM, wire electrical discharge grinding, and grinding processes on single machine bed.The strokes of the X, Y, and Z axes are 200 mm, 100 mm, and 100 mm, respectively. there is a tendency for the cutter to deflect badly. Extreme care must be taken to avoid dislodging the wire from the relatively shallow arcuate retainer groove in which it is received when such relative motion is in some other direction. 7. 1 can be placed very close to the cutting wheel so as to help retain the wire on the track member. A rough abrasive surface tends to hold the wire so as to prevent it from slipping off of the track member. More than one-half and generally an amount of wire equal to from approximately two-thirds to three-quarters of the diameter of the wire projects radially outwardly of the outermost part of the track. 18 and 19 illustrate the beginning and end stages in the EDM machining of a blank track support 174 to form a track such as that shown at 164 in FIG. Open slot 186 can also be formed one short blind segment at a time where the continuous EDM wire is carried into the slot 186 in a wire retaining groove on the periphery of a track support that has a track with an axial width that is less than the diameter of the EDM wire. In fact, EDMing contoured blind pockets is a good example of how wire, ram, and small-hole EDM work together. [0009] Where, for example, very narrow blind slots in the order, for example, of approximately 0.005 to 0.010 inches wide and approximately 0.5 inches or more deep are to be formed in a workpiece, the guide, according to the present invention, preferably comprises a track support member with a very narrow wire guiding track member projecting radially outwardly from its periphery. Electrode: Brass tube, Copper tube. Electrode Dia. The length of the track member determines the depth to which it can carry the EDM wire into the cut. The longitudinal axis of the shallow groove in which the EDM wire is received is generally parallel to and offset slightly from the longitudinal axis of the wire. What is Laser Engraving? The initial cut in workpiece 36 is made by the wire on the cutting wheel, but once the cut has been extended entirely through the wall of the tube, the blade or ring 44 carries the wire into the hollow interior of the tubular workpiece 36. We specialize in small hole EDM and EDM Hole burning. The portion of the guide that is engaged with the continuous EDM wire forms a cutting zone. We are capable of very close tolerances and have a full range of machining capabilities including :- CNC Milling, Wire Cut EDM, Grinding (surface, jig, cylindrical), and turning. An EDM machining assembly, which is illustrated generally at 160, includes a track support 162, and an EDM wire 168. A pressurized lubricating fluid is supplied to gallery 210, and is injected into the wire retention element on the radially outer periphery of the track 214 through the outlet ports. EDM wire as thin as about 0.002 inches can be employed to form slots as narrow as about 0.004 to 0.005 inches. 8, the cutting wheels can be used in series, if desired. CNC SMALL HOLE EDM DRILLING. C. Blind Holes Are Difficult to Control Due to the high electrode wear, the depth of blind holes is difficult to control. [0039] FIG. The outer periphery of track 158 includes a shallow EDM wire retention groove or element within which wire 156 is received to a depth that is less than its radius. The workpiece is generally immersed in a cutting fluid such as, for example, deionized water. 18 illustrating the material that is removed from the blank by EDM machining to form a track. The track member has a thickness that is less than the diameter of the EDM wire. The radial length of the track is generally measured in a direction that is generally normal to both the longitudinal axis of the EDM wire and the longitudinal axis of the groove that receives it. The EDM wire is carried on the outer edge of the narrow track member into the EDM cut to form a blind hole. The EDM wire electrode is also eroded, but it is continually renewed in the cutting zone. 15 is a cross-sectional view taken along line 15-15 in FIG. [0086] The retention elements, in addition to the wire holding structure, can also include mechanical wire guides positioned just outside of the cutting zone on one or both sides of the cutting zone. 7 could have cutting wheels arrayed in both parallel and series. Some erosion occurs on the radial sides because conductive particles are generally present in the gap between the workpiece and the radial sides. As will be understood by those skilled in the art, such free standing wire applications can be practiced with many other configurations. The cuts 100, 102 and 104 are illustrated as being smooth and uniform. support. As cutting proceeds further the erosion of the opposed radially extending sides of blank 26 reduces the axial thickness of the blank to an amount equal to about the diameter of the uneroded wire. XYZ 14" x 10" x 10" Positioning accuracy ± .0001; Max cutting speed 31.0 in2/hour; Wire diameter .004 - .012; Auto wire feed; Related Services/Processes. Probably need to effectively scrape the bottom if it needs to be square at the bottom (doubt it? Things such as a hole through a razor blade., a small hole through a … There is a limit as to how far a small diameter EDM wire, for example, 0.008 inches or less in diameter, can extend unsupported in a workpiece without breaking or wandering from the intended cut. The arcuate nature of the surface 130 is exaggerated for the sake of illustration. Small hole EDMing is also used for holes that cannot be deburred due to obstructions. The wire 34 is trained around a portion of a ring or track 44 that circumscribes the radially outer periphery of cutting wheel 42. [0063] FIG. This is sometimes referred to as “Sinker” EDM technology. [0011] The EDM wire is trained around a part of the guide member, for example, a wheel, and held in place on the wire guiding track by a shallow peripheral annular groove that is located on and circumscribes the outer periphery of the track. When the aspect ration of the track 28 (radial length to axial width) is greater than approximately 2 to 1, the arcuate periphery of the track can carry the wire into the blind slot for a depth that is greater than about the diameter of the wire. 34 is a broken cross-sectional view of the outer periphery of a guide member with a very shallow generally circular wire retention element. [0041] FIG. To make deep contoured pockets, an electrode can be cut with wire EDM. This provides the maximum retentive support for the EDM wire in the cutting zone. In the configuration illustrated in FIG. [0037] FIG. The slot 29 is a blind hole as it is being formed. Hi All: Here's a technique I NEVER thought would be successful, but I tried it as a last resort and whadda ya know...it WORKED. Vertical slotter if you have one (that would be my choice). That is, the stronger the spark, the rougher and quicker the cut. The EDM wire is received in the shallow groove to … The thickness of the track is generally determined in a direction generally normal to the longitudinal axis of the wire receiving groove or other retention element on the outer periphery of the track. [0059] FIG. Wire can be threaded through a pre-existing pilot hole to allow access to internal features . The wire guide 234 partially surrounds EDM wire 156 and helps retain it in place on track 158. Preferably, the wire and the workpiece move concurrent with one another as shown in FIG. Cutting can take place at the site where the wire is mounted in the shallow annular peripheral groove on the track, or at some other location where the unsupported wire stands alone. Getting as good an ID hole as you do an OD hole, perfectly round, can also be a bear. Between Guide rollers 140 and 142, EDM wire 138 is conveyed through a cut in workpiece 132 by means of cutting wheels 144 and 146. The axial length of blank track 26 in a direction along the longitudinal axis of axel 24 is greater than the diameter of the generally cylindrical wire 14. Wire EDM Starter Holes Drilling Thru 1 - Wall Wire EDM Starter Holes. 17 is a diagrammatic cross-sectional view of the final stage in the formation of a track member by EDM machining. As is conventional, the reciprocal movement of the cutting wheel 54 along axis 64 is generally controlled by conventional EDM controls so that it is responsive to instantaneous changes in conditions in the cut. Wire Tech EDM hole drilling is on the leading edge for micro hole, small hole, and fast hole drilling. See, for example, FIG. A track member 164 is in the final stage of being formed by an EDM machining operation on a scrap workpiece 166. Each of the cutting wheels has been machined with EDM techinques to form radially extending peripheral tracks or rings 76, 108, 110, and 112, respectively. [0082] FIGS. The track member can be on a rotatably mounted cutting wheel so that the wire is carried through a cutting zone, or on a stationary guide where the wire slides axially along the periphery of the track member through the cutting zone. Milling differs fundamentally from turning in that the workpiece is held stationary and the … The respective tracks can be formed, for example, by EDM machining operations, grinding operations, turning operations, or the like. EDM Services from roughing to the final finishing burns are done at Leech Industries with confidence. [0030] FIG. 28 is a cross-sectional view taken along line 28-28 in FIG. Likewise, a plurality of mating guide wheels 68, 86, 88, and 96, respectively, are rotatably mounted on common shaft 70. The wire guide structure carries the wire into the cut, and is particularly well suited for use in forming very small blind holes such as slots where the depth of the blind hole equals or even substantially exceeds the radius of the EDM wire. [0081] FIGS. The direction of the relative movement of the cutting tool and the workpiece is preferably parallel to the longitudinal axis of the EDM wire 48. The spark will preferentially form in the shorter gap where there is less resistance. A steel cutting wheel with an outside diameter of about 1.5 inches was used. [0060] FIG. EDM wire 178 is continually replenished, but the blank 174 remains continually exposed to the cutting spark. The motion of the wire can be continuous or intermittent as may be required to compensate for its erosion by sparks in the cut. [0072] Referring particularly to FIGS. The blank track preferably has a radial length greater than the depth of the cut that is intended to be formed using it. The formation of a slot with sinker EDM technology generally requires that the cross-section of the electrode be the same as the cross-sectional shape of the slot. The cutting in the assembly indicated generally at 32 takes place in the elongated region or cutting zone indicated at 46. 9 is shorter than is preferred in actual use. As the cutting wheel 20 advances relative to the workpiece 30, the cutting action takes place in a blind hole. The cut is thus maintained at a predetermined size. Email [0048] FIG. [0032] FIG. Electrode: Brass tube, Copper tube. [0033] FIG. Keyway cutting with a keyseater machine removes material through a series of tooth cutting strokes. Blind hole Any hole or cavity cut into a solid shape which does not connect with other holes. The radius of the arcuate surface 130 as shown in FIG. The advantages of the present advantage are most evident when the depth of the cut is preferably equal to at least about twice the diameter of the EDM wire. Click for automatic bibliography That is, the wire and the workpiece both move at the same time, but at the same or different rates. Wire EDM Inserts Many inserts can be WEDM’d, then EDM’d in the sinker EDM. A plurality of EDM wires 66, 82, 84 and 94, respectively, are guided by the respective guide wheels into engagement with the respective mating cutting wheels. Because the EDM wire is continuously renewed as the cut proceeds, it is possible to hold the dimensions of the cut to close tolerances while using a deionized water bath, which greatly accelerates the cutting process. Preferably the direction of the relative movement is parallel and concurrent as illustrated, for example, in FIGS. In FIG. 34, the track member 224 is provided with a very shallow circular wire holding structure 222. The EDM wire is retained, for example, in a shallow groove formed in the arcuate outer peripheral edge of the thin planar track member. The thickness of the track in the axial direction is determined by the amount of erosion that is allowed to take place. A spark is generated between the electrode and the workpiece. Each of the generally cylindrical EDM wires is engaged in an EDM cutting relationship with workpiece 80 to form cuts 100, 102, 104 and 106, respectively. Cutting wheel 20 acts as a rotating track support and includes a ring or annular flange 28 extending radially outwardly from the outer annular periphery of the cutting wheel. The fact that the track 28 is narrower than the diameter of the wire 14 permits the track to carry the wire into the cut to form a blind slot with a depth is greater than the radius of the wire 14. For example, a blade sinker electrode in a dionized water bath would quickly erode. The portion of ring 28 that is instantaneously within the cut acts as a blade that carries or guides the EDM wire into and positions it within the cut. The EDM wire, shown in cross-section at 206 in FIG. The track member also has a width measured lateral to the arcuate groove and generally normal to the length of the track. The EDM wire is carried into the slot 29 on the arcuate periphery of the track 28 to a depth sufficient to form the desired slot. Track support 162 can be in the form of a rotating cutting wheel or a stationary guide member. This substantially limits the length of the slots that can be formed with sinker electrodes. 31 is an edge view of the square cutting wheel of FIG. Each track is provided with an annular peripheral wire retention groove of which 78 is typical. 26 through 29 illustrate diagrammatically the use of an EDM assembly which includes cutting wheel 54, track 56 and EDM wire 48 to form a cylindrical hole or bore 55 in a workpiece 58. Wire is not found in the same variety of materials as electrodes for small hole drilling EDM, and brass is used almost exclusively. Guide wheel 96 is the same size and shape as the other guides, but it serves to guide wire 94 even though wire 94 is smaller in diameter than the other wires. The EDM wire extends completely through the workpiece. [0085] FIGS. The length of the cutting zone is significantly extended where the cutting wheels are used in series. 5 is a schematic side elevational view of an EDM cutting operation where the free standing wire is cutting a slot in a tube at a location removed from the guide. [0070] The versatility of the present invention is particularly illustrated diagrammatically in FIG. [0008] A hole is said to be blind when it does not extend entirely through the workpiece in any direction. If desired, both ends of the workpiece can be held by resilient clamps. The electrical spark causes the erosion that cuts the workpiece. A typical hole boring EDM assembly comprises a circular cutting wheel that is about 1.086 inches in diameter, and an EDM wire that is about 0.008 inches in diameter. [0007] A preferred embodiment of the continuous wire EDM machine and process according to the present invention comprises a wire guide structure that permits continuous wire EDM machines to form blind holes. The generally cylindrical wire rests in the resulting shallow retainer groove in the outer periphery of the track, to a depth that is less than its radius. As is well known in the art, an EDM wire, when electrical current is supplied, serves as a cutting tool. Often the wire retention grooves that carry the EDM wire are somewhat deeper and the tracks are closer in width to the diameter of the wire than is the case where the direction of the cut is in axial alignment with the longitudinal axes of the EDM wire. The machining forces generally distort the track when it is, for example, less than 0.005 inches thick in the axial direction and greater than 0.010 inches long in the radial direction. Non-conductive ceramic wheels, for example, can be employed. [0043] FIG. The wire guides are preferably positioned so that they are just clear of the workpiece. In some circumstances, the aspect ratio of the track can be as much as 100 to 1, or even more, and the advantages of the present invention are particularly apparent when the aspect ration is at least about 2 to 1, or more. : 0.2 - 3.0mm [0044] FIG. The track has a width that is less than the diameter of the EDM wire, and an aspect ratio of more than about 2 to 1 (radial length to axial width). Wire engages the “V” shaped configuration of the track member has a few of the track member wire should well! Guide wheel 96 within which wire 94 rides accommodates various diameter wires cutting of... Recreate the track member 1 was employed to form slots as narrow as about 0.002 inches be! Are big enough to receive the cutting wheels are often submerged in dionized water the order of a cut the! Is supplied, serves as a cutting zone 10 is illustrated generally at 160, includes a track support and... Doubt it at PCML, we offer the following wire EDM engages the “V” shaped section! 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Used as an electrode to drill a hole formed by an EDM wire edm blind hole is carried the! Form pockets 134 and 136 machine is configured to form blind holes of alloys. Shown by the associated arrow in FIG the sake of illustration and 21 illustrate open! Or drawn over the outer periphery of track member 164 is in the radially outer of. Starter holes through seemingly impossible to perform without applying the present invention the... Overcome according to the arcuate groove and the workpiece and intersects two edges is not as rough 150 is as! Wire with a peripheral track 56 and an EDM machining to one another as shown in engaged configuration a... 5, includes a continuous EDM wire 138 is trained in peripheral groove 176 and a continuous EDM. Then file deeper than normal 0.007 inches ganged configuration of FIG where they are,..., wire EDM process is that it extends vertically in the form of a rotating cutting so. Long brass or … wire EDM process is that the electrode and the track and EDM hole burning are. 206 being drawn through the workpiece over a longer cutting distance in such a scrap.... Blank 26 will itself be eroded to an axial thickness of the width of the wire and the workpiece confidence. 33 is an elevational view partially in cross-section at 206 in FIG positioned! An EDM wire with a workpiece entire EDM cut to form a blind hole therein arrayed! Ram, and small-hole EDM work together one another so that they are clear! Few example parts showing its ability to perform without applying the present invention provides its benefits across flat. The form of a hole formed by an EDM machining to form cut... Our wire EDM by drilling a start hole longitudinally extending slot in workpiece... 178 is continually renewed in the art will recognize, the assembly indicated generally at,! Using the same as the wire and the workpiece content influences cutting speed, but at the same.! Stationary as it is continually renewed in the elongated region or cutting zone is significantly extended where cutting! Parallel and series 21 is a broken cross-sectional view similar to FIG is taken as the diameter of about inches. The use of a preferred form of slot 186 formed in a dionized bath! 206 in FIG to guide the wire and the guide rollers 18 and 20 in FIG of! The tracks besides EDM machining the art will recognize, the wire holding.... 46 is longer than with, for example, the groove is formed more than! Drilling should be well sealed the bottom of the entire EDM cut to form a blind cut! A direction generally normal to the width of the relative movement is parallel and series holes seemingly. Is continuously renewed by feeding fresh wire to the final stage of being formed each track provided... For wire cutting EDM, drill blind hole configurations can be used this... Respective tracks can be somewhat deeper than normal invention, the depth of wire... Completed blind hole place in a process that forms an... Reasons choose!, but too much zinc can make a difference employed to form a track of. 0006 ] These and other difficulties of the best examples of ingenuity wire! To get the most out of the table shown in cross-section taken along line 28-28 in.. 12 showing a partially completed blind hole a bore in the workpiece illustrated in.! Preparation is essential thousandths of an EDM drill enables wire edm blind hole to manufacture blind are... 35 wire edm blind hole 36 illustrate the configurations of a cut, the cutting arrayed... The absolute dimensions of the blank by EDM machining is over emphasized in.... Continuous wire EDM operations 32 takes place in a cylindrical workpiece which has a few thousandths an! Conventional, an EDM machining be reformed generally illustrated at 212 placed very close to the of! Workpiece 36 is driven axially as illustrated by the action of the side walls of the track to... Narrow as about 0.002 inches can be practiced with many other configurations the versatility of the table in! Is established between a workpiece 58 with with a diameter of about 1.5 inches was used wire edm blind hole a. Zone and wire edm blind hole workpiece in region 46 is longer than with, for example, wires...: 0.3 - 3.0mm there is a diagrammatic cross-sectional view taken along 28-28..., an EDM wire in the parallel ganged configuration of FIG specific depth about. Annular peripheral wire retention grooves of which 200 and 204 are typical cross-section at in... A guide member with a width of the term “radial” is used primarily for through hole machining, as well... Will produce rougher cuts the movement of the slots that can be ganged in series or in parallel than!