Adam Myszkowski

A Simulative Study Approach for Improving the Efficiency of Production Process of Floorboard Middle Layer

The subject of this paper is the simulation study into the improvement of the production process of floorboard middle layer. The object of our interest in the manufacturing process of wooden floorboard which consists of three layers: lower—made of softwood pieces glued together; middle—in a form a module, made of softwood slats and plywood, and hardwood upper layer. The process improvement involved a better use of raw materials in the form of plats (of variable dimension groups) by reducing losses caused by defects such as wane and knots. A simulation model of the manufacturing process was created by using DES software. Thanks to that model, buffers size and a performance of the designed systems including their anticipated breakdowns were estimated. As a result of the study, a concept of the entire production system meeting the requested production capacity and material efficiency was devised.

Kinematics of a Novel Type Positioning Table for Cast Alignment on Machine Tool

The paper presents a study into the kinematics of a novel type of a rotary positioning table based on the constrained parallel mechanism. Fixture and leveling a workpiece on a machine tool table is an essential stage in machining or layout process. In this study, a compact low-height rotary table is presented for automated leveling, which can be mounted directly on the machine tool table without a significant decrease of the workspace. The authors propose a modification of parallel mechanism by introducing four extensible leg design with specific geometrical constraint for workpiece positioning and in order to achieve higher rigidness. The table is driven by four hydraulic linear actuators which are integrated in the linkages. The designed model allows to rotate the table about the sphere center about three independent axis. Procedures using meta-heuristic methods were implemented to optimize the geometrical dimensions of the entire mechanism for the required workspace.Copyright

Development of Force Feedback Controller For the Loader Crane

The publication describes development process of the haptic joystick electronic controller design. The system proposed here was used for positioning of an electrohydraulic manipulator (laboratory model of the loader crane). Authors built controller basis on the 32-bits microcontroller type STM32f407 equipped with DMA controller (Direct Memory Access). The joystick prototype was equipped with DC motor and incremental encoder. Authors implemented an on–off current regulator for DC motor. This allows to control motors torque and therefore the force generated at the end of the joystick effector. The actual current value for on–off regulator was taken from the hall effect sensor. The haptic joystick with its controller was tested with use of an electrohydraulic manipulator equipped with proportional valves.