|  | B |
SECTION B — PERFORMING OPERATIONS; TRANSPORTING

SHAPING

|  | B23 |
MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR (punching, perforating, making articles by processing sheet metal, tubes, or profiles Fulltext... Hierarchy... Expanded...B21D; wire-working Fulltext... Hierarchy... Expanded...B21F; making pins, needles, or nails Fulltext... Hierarchy... Expanded...B21G; making chains Fulltext... Hierarchy... Expanded...B21L; grinding Fulltext... Hierarchy... Expanded...B24)

|  | B23 |
Note(s) In addition to operations not provided for in any other class, this class provides, in sub-class Fulltext... Hierarchy... Expanded...B23P, for combinations of operations provided for in different sub-classes of classes Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...B21-B24, with the exception of subsidiary operations performed in conjunction with main operations covered by a single sub-class. In the following elaborations: The term "metal-working" should be understood as covering the working of other materials unless the context requires otherwise. The term "kind of operation" and similar expressions relate to such metal-working operations as boring, drilling, milling and grinding. The term "kind of machine" means a machine designed for a particular kind of metal-working operation (e.g. a lathe). The term "form of machine" means a machine of a particular kind adapted or arranged for a particular way of working or for particular work, e.g. face-plate lathe, tailstock lathe, turret lathe. The term "different machines" is to be understood as covering different forms of machines for performing the same type of metal-working operation, e.g. vertical and horizontal boring machines. Sub-class Fulltext... Hierarchy... Expanded...B23Q comprises features, specific to machine tools, which relate to a requirement or problem of a nature which is not peculiar to a particular kind of machine tool, e.g. feeding work, although the realisation of these features may differ according to the kind of machine tool concerned. That sub-class provides in general for such features, even if the feature or a specific function, in any particular case, is to some extent peculiar to, or is claimed only for, machine tools designed for one particular operation; only in exceptional cases are such features to be classified in the sub-class for the machine tool concerned. Certain features of this general nature are, however, referred to sub-classes relating to particular metal-working operations, especially Fulltext... Hierarchy... Expanded...B23B, in which case the sub-classes in question are not restricted, in respect of those features, to the kind of machine tool with which they are primarily concerned. If details, components, or accessories have no essential feature specific to machine tools, the more general class, e.g. Fulltext... Hierarchy... Expanded...F16, takes precedence.

|  | B23G |
THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH (thread-forming by corrugating tubes Fulltext... Hierarchy... Expanded...B21D 15/04; by rolling Fulltext... Hierarchy... Expanded...B21H 3/02, by forging, pressing, or hammering Fulltext... Hierarchy... Expanded...B21K 1/56; making helical grooves by turning Fulltext... Hierarchy... Expanded...B23B 5/48, by milling Fulltext... Hierarchy... Expanded...B23C 3/32, by grinding Fulltext... Hierarchy... Expanded...B24B 19/02; arrangements for copying or controlling Fulltext... Hierarchy... Expanded...B23Q)

|  | B23G |
Note(s) The term "thread cutting" is to be understood as including the use of tools similar both in form and in manner of use to thread-cutting tools, but without removing any material.

|  | B23G 1/00 |
Thread cutting; Automatic machines specially designed therefor

|  | B23G 1/02 |
· | on an external or internal cylindrical or conical surface, e.g. on recesses (Fulltext... Hierarchy... Expanded...B23G 1/16, Fulltext... Hierarchy... Expanded...B23G 1/22, Fulltext... Hierarchy... Expanded...B23G 1/32, Fulltext... Hierarchy... Expanded...B23G 1/36 take precedence)

|  | B23G 1/04 |
· · | Machines with one working-spindle

|  | B23G 1/06 |
· · · | specially adapted for making conical screws, e.g. wood-screws

|  | B23G 1/08 |
· · | Machines with a plurality of working-spindles

|  | B23G 1/10 |
· · · | specially adapted for making conical screws, e.g. wood-screws

|  | B23G 1/12 |
· · | Machines with a toothed cutter in the shape of a spur gear or the like which is rotated to generate the thread profile as the work rotates

|  | B23G 1/14 |
· · · | specially adapted for making conical screws, e.g. wood-screws

|  | B23G 1/16 |
· | in holes of workpieces by taps (Fulltext... Hierarchy... Expanded...B23G 1/26, Fulltext... Hierarchy... Expanded...B23G 1/32, Fulltext... Hierarchy... Expanded...B23G 1/36 take precedence)

|  | B23G 1/18 |
· · | Machines with one working-spindle

|  | B23G 1/20 |
· · | Machines with a plurality of working-spindles

|  | B23G 1/22 |
· | Machines specially designed for operating on pipes or tubes

|  | B23G 1/24 |
· · | portable

|  | B23G 1/26 |
· | Manually-operated thread-cutting devices (features of the threading tool per se Fulltext... Hierarchy... Expanded...B23G 5/00)

|  | B23G 1/28 |
· · | with means for adjusting the threading tool

|  | B23G 1/30 |
· · | without means for adjusting the threading tool, e.g. with die-stocks (tap wrenches Fulltext... Hierarchy... Expanded...B25B)

|  | B23G 1/32 |
· | by milling

|  | B23G 1/34 |
· · | with a cutting bit moving in a closed path arranged eccentrically with respect to the axis of the rotating workpiece

|  | B23G 1/36 |
· | by grinding

|  | B23G 1/38 |
· · | with grinding discs guided along the workpiece in accordance with the pitch of the required thread

|  | B23G 1/40 |
· · | with grinding discs guided radially to the workpiece

|  | B23G 1/42 |
· | Centreless grinding

|  | B23G 1/44 |
· | Equipment or accessories specially designed for machines or devices for thread cutting

|  | B23G 1/46 |
· · | for holding the threading tools

|  | B23G 1/48 |
· · | for guiding the threading tools

|  | B23G 1/50 |
· · | for cutting thread by successive operations

|  | B23G 1/52 |
· · | for operating on pipes or tubes

|  | B23G 3/00 |
Arrangements or accessories for enabling machine tools not specially designed only for thread cutting to be used for this purpose, e.g. arrangements for reversing the working-spindle

|  | B23G 3/02 |
· | for withdrawing or resetting the threading tool

|  | B23G 3/04 |
· · | for repeatedly setting the threading tool in a predetermined working position

|  | B23G 3/06 |
· | for compensating inaccuracies in the pitch of the lead-screw

|  | B23G 3/08 |
· | for advancing or controlling the threading tool or the work by templates, cams, or the like

|  | B23G 3/10 |
· · | for cutting thread of variable pitch

|  | B23G 3/12 |
· · | for using several adjacently-arranged threading tools, e.g. using several chasers

|  | B23G 3/14 |
· · | for cutting thread of conical shape

|  | B23G 5/00 |
Thread-cutting tools; Die-heads

|  | B23G 5/02 |
· | without means for adjustment

|  | B23G 5/04 |
· · | Dies

|  | B23G 5/06 |
· · | Taps (chucks therefor Fulltext... Hierarchy... Expanded...B23B 31/00)

|  | B23G 5/08 |
· | with means for adjustment

|  | B23G 5/10 |
· · | Die-heads

|  | B23G 5/12 |
· · · | self-releasing

|  | B23G 5/14 |
· · | Tapping-heads

|  | B23G 5/16 |
· · · | self-releasing

|  | B23G 5/18 |
· | Milling cutters

|  | B23G 5/20 |
· | combined with other tools, e.g. drills

|  | B23G 7/00 |
Forming thread by means of tools similar both in form and in manner of use to thread-cutting tools, but without removing any material (features of machines or devices not specially adapted to the particular mode of forming the thread Fulltext... Hierarchy... Expanded...B23G 1/00)

|  | B23G 7/02 |
· | Tools for this purpose

|  | B23G 9/00 |
Working screws, bolt heads or nuts in conjunction with thread cutting, e.g. slotting screw heads or shanks, removing burrs from screw heads or shanks; Finishing, e.g. polishing, any screw thread (making washers or nuts by processing metal sheets, tubes or profiles without essentially removing material Fulltext... Hierarchy... Expanded...B21D 53/20, Fulltext... Hierarchy... Expanded...B21D 53/24)

|  | B23G 11/00 |
Feeding or discharging mechanisms combined with, or arranged in, or specially adapted for use in connection with, thread-cutting machines (for machine tools in general Fulltext... Hierarchy... Expanded...B23Q)