Abstract: The present invention relates to a honing tool having a tool body in lightweight construction, and at least two radially feedable hone strips, the hone strips being radially feedable via a rack-and-pinion gear, the rack-and-pinion gear comprising a central toothed shaft adapted and arranged to interact with racks associated to the respective hone strips to feed the hone strips, wherein the honing tool comprises a pneumatic measuring device for in-process diameter measurement of a diameter of an opening to be machined in a workpiece.

Abstract: A honing tool for working several separate bores that are arranged coaxially in series and have different diameters. The honing tool includes several cutting bar groups arranged coaxially in series, wherein a diameter of a cutting bar group of the several cutting bar groups, which diameter is formed by radially extendable cutting bars, differs from a corresponding diameter of at least one other cutting bar group of the several cutting bar groups. A centering bar group is arranged in an axial direction to a free end of the honing tool adjacent at least one cutting bar group; or a guide bar group is arranged directly adjacent opposite the free end of the honing tool adjacent the at least one cutting bar group, or both the centering bar group and the guide bar group are arranged accordingly.

Abstract: The present invention relates to a honing tool (31) for working several separate bores arranged coaxially in series (17a, 17b, 17c) and with different diameters. The honing tool (31) comprises several cutting bar groups (3, 4, 5) arranged coaxially in series, wherein a cross section formed by radially extendable cutting bars (18) of a cutting bar group (3, 4, 5) differs from the cross section of at leas one other cutting bar group (3, 4, 5). The cutting bar groups (3, 4, 5) are constructed and arranged in such a manner that a through bore (17a, 17c) can be worked during a single work step by at least one first cutting bar group (3, 5) and a stepped bore (17b) can be worked by at least one second cutting bar group (4).

Abstract: The invention relates to a device (1) for the combined precision turning and honing of a cylindrical borehole (35). The device (1) according to the invention can comprise either only honing stones (29) which can be fed or also cutters (7) that can be fed during machining.

Abstract: The invention proposes a device which prepared a cylinder bore of a combustion engine in one working stroke such that the cylinder bore can subsequently be thermally coated.

Abstract: The invention relates to a device (1) for the combined precision turning and honing of a cylindrical borehole (35). The device (1) according to the invention can comprise either only honing stones (29) which can be fed or also cutters (7) that can be fed during machining.

Abstract: A device which processes a cylinder bore of a combustion engine in one working stroke prepares the cylinder bore for a subsequent thermal coating.

Abstract: A process for manufacturing 5-chloromethyl-2,3-pyridine dicarboxylic acid anhydrides (I) wherein Z is hydrogen or halogen; Z1 is hydrogen, halogen, cyano or nitro; comprising the steps of (i) reacting a compound of formula (II), wherein the symbols have the meaning given in formula (I), with a chlorinating agent, optionally in the presence of a radical initiator in a solvent selected from halogenated hydrocarbons, and (ii) crystallizing the compound (I) formed in step (i) from a solvent selected from chlorobenzene, 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,4-dichlorobenzene, dichloroethane, trichloromethane, dichloromethane, toluene, xylenes, ethyl acetate, methyl tert.-butyl ether, and mixtures thereof. Compounds (I) are useful intermediates in the synthesis of herbicidal imidazolinones.