This work presents some of researches performed by the authors on execution of plastic parts required for repair works specific to certain machines and plants. Authors focused especially on the repair and reconditioning of certain assemblies which include various machine parts: special spacers, machine-tools guides and toothed gears. Methods shown herein are very simple, accessible even to small workshop and they do not require special equipment, thereby involving minimal expenses. The use of simple programs allow fast and low-cost execution of parts with an accurately determined geometry.

In this paper, the authors show a part of research works performed on the use of 3D scanners and 3D printers to execute the molds required for the cast of parts with complex surfaces. 3D scanning allows copying of certain surfaces in our environment, based on existing models. The finished parts may also be executed from metals that are relatively easy to cast (bronze, aluminum etc.). In order to execute the molds destined for the casting, various pieces may be scanned, with a volume size in the range of [150x150x200 mm3 ÷ 500x500x2000 mm3]. Plastic model printing is performed depending on the capacity of the 3D printer used. This paper shows the results achieved with general-purpose scanner and printer, valued at affordable prices.

In this paper, the authors show a part of research works performed on the use of 3D scanners and 3D printers to execute plastic parts with complex surfaces. 3D scanning allows copying of certain surfaces in our environment, based on existing models. Scanned models may represent various objects, made of a wide range of materials: metals, ceramics, fabrics, plastics, leather, organic materials etc. [1]. This paper shows the results achieved using a scanner and a common and affordable - low-price - printer. 3D scanners and printers allow execution of clones of certain parts with irregular surfaces.

In the case of vertical travels of large masses it is necessary to have counterbalancing systems, besides the kinematic chain of feed/positioning. These systems have a positive influence on machine accuracy. The counterbalancing systems are mechanic or hydraulic. In some cases, hydraulic systems containing one cylinder and one or several accumulators in a theoretically closed-loop are used. This paper presents mathematical models and simulation programs for closed-loop counterbalance systems.

In this paper, the authors present some of the theoretical and experimental research conducted on the occasion of rotary tables remanufacturing for CNC machine tools belonging to Boring and Milling Machines family. They give the constructive solutions applied on CNC machines and the specific systems of guiding, locking and driving. The authors present also the modifications required when passing from CC variant to CNC variant in terms of locking - indexing systems and hydraulic suspension systems. The paper presents different achievements but insists particularly on the remanufacture of the rotary table with useful area 1700x2000 mm with longitudinal travel of 1000 mm (MRD 1700x2000/1000).