Performance improvement of the LM device and its application to precise measurement of motion trajectories within a small range with a machining centre

In order to apply the LM device previously developed to precisely measuring small motion trajectories located on the different motion planes, three major improvements are successfully performed under the condition of completely maintaining the advantages of the device. These improvements include 1) development of a novel connection mechanism to smoothly attach the device to the spindle of a machining centre; 2) employment of a new data sampling method to achieve a high sampling frequency independent of the operating system of the control computer; and 3) proposal of a set-up method to conveniently install the device on the test machining centre with respect to different motion planes. Practical measurement experiment results with the improved device on a machining centre sufficiently demonstrate the effectiveness of the improvements and confirm several features including a very good response to small displacement close to the resolution of the device, high precision, repeatability and reliance. Moreover, based on the measurement results for a number of trajectories for a wide range of motion conditions, the error characteristics of small size motions are systematically discussed and the effect of the movement size and feed rate on the motion accuracy is verified for the machining centre tested

Tris(2-amino-1,3-thia­zole-κN 3)(7-oxa­bicyclo­[2.2.1]heptane-2,3-dicarboxyl­ato-κ3 O 2,O 3,O 7)cadmium(II) dihydrate

In the crystal structure of the title complex, [Cd(C8H8O5)(C3H4N2S)3]·2H2O, the CdII atom exhibits a slightly distorted octa­hedral CdO3N3 coordination, defined by the bridging O atom of the bicyclo­heptane unit, two O atoms from the carboxyl­ate groups and by three N atoms from three 2-amino­thia­zole ligands. Uncoordinated lattice water mol­ecules are also present in the crystal structure. N—H⋯O and O—H⋯O hydrogen-bonding inter­actions link the components into a three-dimensional structure

rac-7-Oxabicyclo­[2.2.1]heptane-2,3-dicarboxylic acid–2-amino-1,3,4-thia­diazole–water (1/1/1)

The title compound, C8H10O5·C2H3N3S·H2O, was synthesized by the reaction of 2-amino-1,3,4-thia­diazole with norcantharidin. The crystal structure is stabilized by N—H⋯O, N—H⋯N, O—H⋯O and O—H⋯N hydrogen bonds. In addition, weak π–π inter­actions are observed between symmetry-related thia­diazole ring systems [centroid–centroid distance = 3.9110 (3) Å, inter­planar spacing = 3.4845 Å]

8-Phenyl-10-oxa-8-aza­tricyclo­[4.3.0.12,5]decane-7,9-dione

The reaction of aniline with norcantharidin produced the imide title compound, C14H13NO3, which shows no significant hydrogen bonds in the crystal structure. The dihedral angle between the phenyl and pyrrolidine rings is 48.48 (6)°

Bis(2-amino-1,3-benzothia­zol-3-ium) bis­(7-oxabicyclo­[2.2.1]heptane-2,3-dicarboxyl­ato)cadmate hexa­hydrate

In the structure of the title complex, (C7H7N2S)2[Cd(C8H8O5)2]·6H2O, the CdII atom is located on an inversion center and is O,O′,O′′-chelated by two symmetry-related 7-oxabicyclo­[2.2.1]heptane-2,3-dicarboxyl­ate ligands in a distorted octa­hedral geometry. The 2-amino­benzothia­zolium cation links with the Cd complex anion via N—H⋯O hydrogen bonding. Extensive O—H⋯O and N—H⋯O hydrogen bonds involving lattice water mol­ecules occur in the crystal structure

exo-4-[(1H-Benzimidazol-2-yl)meth­yl]-10-oxa-4-aza­tricyclo­[5.2.1.02,6]decane-3,5-dione

In the title compound, C16H15N3O3, the dihedral angle between the approximately planar benzimidazolyl group (r.m.s. deviation = 0.010 Å) and the pyrrolidine ring is 78.20 (6)°. The C—C—N bond angle of the bridging CH2 group is 112.14 (16)°. In the crystal, mol­ecules are linked via N—H⋯N hydrogen bonds, forming infinite chains parallel to [101] and [10]

4-(3,5-Dioxo-10-oxa-4-aza­tricyclo­[5.2.1.02,6]decan-4-yl)-10-oxa-4-aza­tricyclo­[5.2.1.02,6]decane-3,5-dione

In the title compound, C16H16N2O6, the dihedral angle between the two pyrrolidine rings is 79.38 (14)°

Diaqua­bis(norfloxacinato)manganese(II) 2,2′-bipyridine solvate tetra­hydrate

In the crystal structure of the title compound {systematic name: diaqua­bis[1-ethyl-6-fluoro-4-oxo-7-(piperazin-1-yl)-1,4-dihydro­quinoline-3-carboxyl­ato]manganese(II) 2,2′-bipyridine solvate tetra­hydrate}, [Mn(C16H17FN3O3)2(H2O)2]·C10H8N2·4H2O, the pyridone O atom and one carboxyl­ate O atom of the two norfloxacin ligands are bound to the MnII ion, which is located on an inversion centre, and occupy equatorial positions, while two aqua O atoms lie in apical positions, resulting in a distorted octa­hedral geometry. The crystal packing is stabilized by N—H⋯O and O—H⋯O hydrogen-bonding interactions

Bis(2-amino-3H-benzothia­zolium) bis­(7-oxabicyclo­[2.2.1]heptane-2,3-dicarboxyl­ato)cobaltate(II) hexa­hydrate

In the crystal structure of the title salt, (C7H7N2S)2[Co(C8H8O5)2]·6H2O, the heterocyclic N atom of the 2-amino­benzothia­zole mol­ecule is protonated. The CoII atom is situated on an inversion centre and exhibits a slightly distorted octa­hedral CoO6 coordination defined by the bridging O atoms of the bicyclo­heptane unit and four carboxyl­ate O atoms of two symmetry-related and fully deprotonated ligands. The crystal packing is stabilized by N—H⋯O hydrogen bonds between the cations and anions and by O—H⋯O hydrogen bonds including the crystal water mol­ecules

Poly[bis­(1H-imidazole)(μ3-7-oxabicyclo­[2.2.1]heptane-2,3-dicarboxyl­ato)cadmium(II)]

The title compound, [Cd(C8H8O5)(C3H4N2)2]n, was synthesized by the reaction of 7-oxabicyclo­[2.2.1]heptane-2,3-dicarboxylic anhydride, cadmium acetate and imidazole. The CdII atom is seven-coordinated in a distorted penta­gonal-bipyramidal configuration by five O atoms from carboxyl­ate groups of three 7-oxabicyclo­[2.2.1]heptane-2,3-dicarboxylate ligands and two N atoms from two imidazole ligands. The crystal structure is stabilized by N—H⋯O and C—H⋯O hydrogen-bonding and C—H⋯π inter­actions