137:. The cutting edges of the drill bit contact the workpiece, and are connected via the shaft with the shank, which fits into the chuck. In many cases a general-purpose arrangement is used, such as a bit with cylindrical shaft and shank in a three-jaw chuck which grips a cylindrical shank tightly. Different shank and chuck combination can deliver improved performance, such as allowing higher torque, greater centering accuracy, or moving the bit independently of the chuck, with a hammer action.
581:
547:
589:
146:
180:
25:
319:
381:
389:
688:
inch or 6.4 millimetres diameter) threaded drill bits and countersinks are common in aircraft metal work. Threaded drill bits may be held in drills meant to reach into very tight spaces, and threaded countersink cutters are widely used (along with finely adjustable depth stops) to create holes which
631:
to be transferred to the drill bit by the friction between the taper shank and the socket. The tang at the end of the taper provides a positive drive of the drill when the taper fails to grip. Many believe that the tang is there for the purpose of ejecting the tool from the taper but as not all tools
403:
Rotational drive uses the sliding keyways that open to the end of the shank, which mate with keys in the chuck. The smaller indentations that do not open to the end are grasped by the chuck to prevent the drill bit falling out. The hammer of the drill hits the flat end of the shank. The shank must be
326:
The flats of a hex shank can either be machined on a round shank, as in the photograph, or be the natural flats of hex bar stock. A hex shank can be grasped by a 3-jaw drill chuck or held in a chuck specifically for hex shanks. Quarter-inch hex shanks are common for machine screwdriver bits and have
399:
The SDS shank is simply pushed into the spring-loaded chuck without tightening. SDS shank and chucks are made to be used for hammer drilling with masonry drills in stone and concrete. The drill bit is not held solidly in the chuck, but can slide back and forth like a piston; it does not slip during
187:
The straight shank is the most usual style on modern drill bits, by number manufactured. The whole of the drill bit, shaft and shank, is usually of the same diameter. It is held usually in a three-jaw drill chuck. Bits of diameter too small to grip firmly can have straight shanks of larger diameter
411:
There are four standard sizes of SDS: SDS Quick, SDS-plus (or SDSplus or SDS+), SDS-Top and SDS-max. SDS-plus is the most common by count of tools manufactured, with masonry drills from 4 mm diameter to 30 mm (and from 5/32" to 1-1/4") diameter ordinarily available. The shortest SDS-plus
436:
inches (44 mm) diameter. Standard lengths are 12 to 21 inches (300 to 530 mm). SDS-Top with 14 mm diameter has been largely phased out in North
America and is not common except for older tools. Hilti's TE-S system is similar to these SDS systems, but is designed for chipping only (no
639:
is often a Morse taper and this allows the chuck assembly to be removed and directly replaced with the shank of a Morse taper drill bit. A range of sleeves may be used to bring the size of the smaller Morse tapers up to the size of the drive spindle's larger taper. Sockets are also available to
665:
Square taper drills were also used for large ratchet drills, for drilling large holes, or in thick plate. These bits would fit straight into a ratchet drill, and the ratchet drill would be used against a strong arm, for pressure to push the drill into the work piece.
153:
This shank was common before 1850, and is still in production. At first, the tapered shank was just rammed into a square hole in the end of the drill. Over time, various chuck designs have been invented, and modern chucks can grasp and drive this shank effectively.
554:
The triangle shank is almost always made by machining three flats on round bar stock. It is intended as a minor modification of a straight shank, still allowing it to be held in a 3-jaw drill chuck, but allowing higher torque transmission and limited slipping.
674:
Some drills, wire wheels, etc. use a threaded shank. One example is cylindrical wire wheels meant to be pushed into a pipe of some sort to clean the inside of the pipe, but some ordinary, but mostly rather large, wood drills have threaded shanks as well.
400:
rotation due to the non-circular shank cross-section, matching the chuck. The hammer of the drill acts to accelerate only the drill bit itself, and not the large mass of the chuck, which makes hammer drilling with an SDS shank drill bit more productive.
444:
468:
456:
498:
in 1960. Hilti's original 10 mm TE-D and 18 mm TE-F shanks can be used in SDS-plus and SDS-max chucks respectively but not vice versa while the newer TE-C, TE-T and TE-Y are fully compatible.
480:
192:
or chuck. Large drill bits can have straight shanks narrower than the drill diameter so that they can be fitted in chucks not able to chuck the full diameter. Such a drill bit is called a
412:
masonry drill bits are about 110 mm overall length, and the longest 1500 mm. SDS-max is more common for larger rotary hammers and chipping guns, and common sizes start at
272:-inch (13 mm) chucks to run the larger drills. S&D bits are 6 inches (150 mm) long with a 3-inch (76 mm) flute length. The name comes from a company in
157:
It has been difficult to find a reference to the included angle of the taper, but 7 different bits were measured, and they all had an included angle of 8 ± 0.25 degrees.
396:
The diameter of a SDS Plus shank is 10 millimeters. The SDS Max is larger with an 18 mm shank diameter, while the SDS Quick has a smaller 6 mm shank diameter.
862:
735:
706:
824:
519:
Relatively complex to manufacture although
Chinese made SDS tools and machines have become very affordable since the patents expired
855:
89:
61:
437:
rotation) in tools for applications larger than could be handled by SDS-Max (e.g. demolition of concrete walls or floors).
880:
375:
930:
68:
848:
817:
108:
584:
Morse taper drills, from 13.5mm (with the No. 1 Morse taper shank) through to a 30mm drill (No. 4 morse taper shank)
42:
75:
1121:
46:
993:
57:
900:
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714:
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spread from that application to be used for drill bits that are compatible with screwdriver machinery.
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983:
276:
that broke up into other companies circa 1890; bits of this design were popularized by that company.
1116:
515:("Clamping System") is used, though Bosch uses "Special Direct System" for international purposes.
1402:
1206:
1191:
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632:
have a tang (e.g. a centre lathe centre) these can still be ejected despite not having the tang.
35:
1236:
1216:
1111:
636:
640:
extend the effective length of the drill as well as offering a variety of taper combinations.
296:
Can be held in a standard drill chuck, which must be tightened—only friction prevents slipping
290:
Minimum of turning or grinding needed if the drill bit is made from appropriately sized round
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795:(New and Revised ed.). The Caxton Publishing Company Ltd. pp. Vol i 137.
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958:
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502:
479:
167:
Moderate torque transmission but without the slipping possible with round shanks
1299:
1259:
1181:
1058:
643:
The detail image shows a Morse taper shank on a 16 mm diameter drill bit.
220:-inch (9.5 mm) chuck. One particular type of reduced-shank drill bits are
1422:
1315:
1279:
1264:
1083:
1038:
1018:
1013:
509:("Insert – Turn – Seated!"). In German-speaking countries the back-formation
580:
1294:
1274:
1161:
833:
653:
High torque transmission provided the bit is driven hard into the workpiece
616:
16:
End of a tool bit grasped by the chuck of the driving component of the tool
600:
pictured right are used in metalworking. The full range of tapers is from
1244:
1171:
1063:
973:
273:
262:-inch (13 mm) reduced shank for all. This allows drill presses with
1397:
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1345:
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291:
126:
588:
179:
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24:
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963:
938:
615:
allows the bit to be mounted directly into the spindle of a drill,
318:
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1068:
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1201:
905:
802:
628:
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360:
350:
303:
chuck (which must be tightened), particularly for smaller sizes
300:
189:
331:
Zero manufacturing if the drill bit is made from hex bar stock
1330:
943:
619:
tailstock, or (with the use of adapters) into the spindle of
495:
285:
134:
522:
Better hammer drilling performance than rigidly gripped bits
309:
Torque transmission limited by slipping of cylindrical shank
188:
than the drill, which can be held firmly in a standard size
408:
to reduce the friction of the sliding action in the chuck.
380:
210:-inch (13 mm) bit to be used in a pistol-grip drill's
525:
Drills with a "rotation-stop" mode can use chiselling bits
388:
334:
Can be held in a drill chuck made for cylindrical shanks
627:) taper of approximately 5/8" per foot that allows the
252:-inch (38 mm) drill body diameter with a standard
689:
put a matching rivet directly flush with the surface.
49:. Unsourced material may be challenged and removed.
340:High torque transmission, limited only by strength
494:in 1975 improving on the TE system introduced by
343:No need to tighten, shape does not allow slipping
164:Very wide tolerances allowable (not very precise)
1420:
856:
818:
510:
870:
863:
849:
825:
811:
337:Can be held in a hex screwdriver bit chuck
109:Learn how and when to remove this message
587:
579:
545:
387:
379:
317:
178:
144:
766:"Standard Dimensions of Sherline Tools"
1421:
728:
699:
844:
806:
790:
711:Encyclopedia of technical terms (A-Z)
575:
47:adding citations to reliable sources
18:
650:Cannot be held in a chuck or collet
528:One-handed quick chucking operation
13:
349:Cannot be held in a regular round
14:
1440:
669:
541:
422:inch (13 mm) diameter up to
174:
832:
707:"SDS-plus tool insertion system"
647:Simple to manufacture on a lathe
531:Can only be held in an SDS chuck
478:
466:
454:
442:
23:
660:
34:needs additional citations for
1122:Electrical discharge machining
911:Numerical control (NC and CNC)
784:
758:
501:The SDS name is an acronym of
140:
1:
793:Engineering Workshop Practice
692:
565:Moderately accurate centering
490:The SDS bit was developed by
376:Chuck (Special Direct System)
346:Moderately accurate centering
200:. For example, this allows a
740:Lexikon der Elektrowerkzeuge
598:Morse taper twist drill bits
559:Can be held in a drill chuck
369:
313:
228:) bits, whose sets run from
7:
969:List of drill and tap sizes
623:. It is a self-locking (or
592:Morse Taper Drill Bit Shank
534:Not very accurate centering
10:
1445:
1285:Magnetic switchable device
373:
170:Appropriate chuck required
1363:
1308:
1235:
1127:Electrochemical machining
1102:
992:
924:
879:
840:
791:Judge, Arther W (1947).
562:High torque transmission
550:Triangle drill bit shank
537:High torque transmission
392:SDS-max drill bit shanks
384:SDS-plus drill bit shank
183:Straight drill bit shank
1207:Rotary transfer machine
1192:Photochemical machining
1132:Electron-beam machining
1094:Tool and cutter grinder
772:. Sherline Products Inc
656:Very accurate centering
359:A special 3c or 5c HEX
306:Very accurate centering
161:Easy to make in a forge
593:
585:
551:
511:
506:
393:
385:
323:
299:Can also be held in a
238:-inch (14 mm) to
184:
150:
1403:Tools and terminology
591:
583:
549:
507:Steck – Dreh – Sitzt!
391:
383:
321:
182:
149:Brace drill bit shank
148:
1321:Machining vibrations
1227:Ultrasonic machining
568:Cannot be held in a
512:Spannen durch System
43:improve this article
1341:Tool and die making
1029:Cylindrical grinder
322:Hex drill bit shank
222:Silver & Deming
1009:Abrasive machining
594:
586:
552:
394:
386:
324:
198:blacksmith's drill
185:
151:
1416:
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1359:
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755:(German language)
576:Morse taper shank
119:
118:
111:
93:
58:"Drill bit shank"
1436:
1326:Speeds and feeds
1079:Sharpening stone
1054:Grinding machine
1049:Grinding dresser
916:Stewart platform
865:
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742:. Archived from
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713:. Archived from
703:
687:
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682:
621:milling machines
514:
482:
470:
458:
446:
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434:
430:
427:
421:
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404:lubricated with
282:centerless grind
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125:is the end of a
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1098:
1089:Surface grinder
1024:Coated abrasive
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988:
959:Drill bit sizes
954:Drill bit shank
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635:The arbor of a
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449:SDS Plus (TE-C)
447:
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372:
316:
268:
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129:grasped by the
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12:
11:
5:
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1182:Milling cutter
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1059:Grinding wheel
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881:Computer-aided
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670:Threaded shank
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574:
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572:
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560:
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542:Triangle shank
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532:
529:
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523:
520:
488:
487:
484:
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473:SDS Max (TE-Y)
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461:SDS Top (TE-T)
460:
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175:Straight shank
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22:
15:
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1316:Cutting fluid
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1313:
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1307:
1301:
1298:
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1280:Machine taper
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1265:Indexing head
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1237:Machine tools
1234:
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1084:Spark testing
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1055:
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1039:Flick grinder
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1035:
1034:Diamond plate
1032:
1030:
1027:
1025:
1022:
1020:
1019:Bench grinder
1017:
1015:
1014:Angle grinder
1012:
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1007:
1005:
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874:and computing
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828:
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787:
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746:on 2007-08-16
745:
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731:
717:on 2007-09-18
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698:
690:
678:Small (about
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363:must be used.
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284:or turn on a
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194:reduced-shank
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63:
60: –
59:
55:
54:Find sources:
48:
44:
38:
37:
32:This article
30:
26:
21:
20:
1295:Rotary table
1275:Lathe center
1162:Machine tool
994:Grinding and
953:
834:Metalworking
792:
786:
774:. Retrieved
770:Sherline.com
769:
760:
748:. Retrieved
744:the original
739:
730:
719:. Retrieved
715:the original
710:
701:
677:
673:
664:
661:Square shank
642:
634:
625:self holding
624:
610:
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99:January 2009
96:
86:
79:
72:
65:
53:
41:Please help
36:verification
33:
1429:Hole making
1373:Fabrication
1309:Terminology
1245:Angle plate
1172:Metal lathe
1064:Jig grinder
974:Tap and die
883:engineering
637:drill chuck
613:Morse taper
274:Salem, Ohio
141:Brace shank
1393:Metallurgy
1187:Pantograph
979:Tap wrench
750:2010-04-11
721:2010-04-11
693:References
485:Hilti TE-S
374:See also:
69:newspapers
1388:Machining
1383:Jewellery
1351:Workpiece
1346:Tramp oil
1336:Tolerance
1167:Machining
1157:Jig borer
1142:Engraving
1117:Broaching
1104:Machining
984:Threading
949:Drill bit
931:threading
872:Machining
370:SDS shank
314:Hex shank
292:bar stock
127:drill bit
1423:Category
1398:Smithing
1137:End mill
1044:Grinding
1004:Abrasive
964:Drilling
939:Die head
926:Drilling
776:30 April
280:Easy to
1408:Welding
1378:Forming
1368:Casting
1300:Wiggler
1290:Mandrel
1260:Fixture
1222:Turning
1217:Skiving
1177:Milling
1152:Hobbing
1074:Sanding
1069:Lapping
996:lapping
683:⁄
431:⁄
417:⁄
267:⁄
257:⁄
247:⁄
233:⁄
226:S&D
215:⁄
205:⁄
83:scholar
1255:Collet
1212:Shaper
1202:Reamer
1197:Planer
1147:Facing
1112:Boring
906:G-code
629:torque
570:collet
503:German
406:grease
361:collet
351:collet
301:collet
190:collet
85:
78:
71:
64:
56:
1331:Swarf
1250:Chuck
944:Drill
736:"SDS"
617:lathe
496:Hilti
492:Bosch
286:lathe
135:drill
133:of a
131:chuck
123:shank
90:JSTOR
76:books
891:2.5D
778:2014
611:The
596:The
121:The
62:news
1270:Jig
928:and
901:CAM
896:CAD
604:to
196:or
45:by
1425::
768:.
738:.
709:.
608:.
505::
235:16
864:e
857:t
850:v
826:e
819:t
812:v
780:.
753:.
724:.
685:4
681:1
606:7
602:0
433:4
429:3
426:+
424:1
419:2
415:1
269:2
265:1
259:2
255:1
249:2
245:1
242:+
240:1
231:9
224:(
217:8
213:3
207:2
203:1
112:)
106:(
101:)
97:(
87:·
80:·
73:·
66:·
39:.
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