The inclusion of the application of the double ball bar (DBB) measurement to the accuracy calibration of five-axis machine tools into the revision of ISO standards is currently under the discussion. This paper presents the modified DBB measurement device, referred to as “DBB5” in our study, where master balls are supported from the 45 ° direction to the spindle axis. It can perform all the circ...

In this paper, we propose two methods based on quaternions to compute the angles of inclination and the angular velocity with 6 degrees of freedom using the measurements of a 3-axis accelerometer and a 3-axis magnetometer. Each method has singularities which occur during the computation of the orientation of the device in the 3-dimensional space. We propose solutions to avoid these singularitie...

Device for axis-stabilizing of low-rigid work pieces has been presented in the article. The method calculation dynamic parameters “work pieces-supports” subsystem is discussed. influence on by different variants fixation explored.

The main purpose of this study is to develop a measuring device by parallel kinematics for measuring a motion accuracy of multi-axis machining centers. The initially developed measuring device had three displacement sensors and it could measure only position of the spindle because it had only 3 DOF. Optical linear encoders were used for the displacement detecting sensors, while the steel balls ...

The first part of the article provides an overview of both single-axis and multi-axis wave energy converter (WEC) technology, with a particular focus on present and past prototype devices. The second part of the article considers a multi-axis concept device that has been developed and tank tested at Lancaster University by successive Master of Engineering project teams. TALOS is a point absorbe...

Design of a Micro Wireless Instrumented Payload for Unmanned Vehicle Testing Benjamin Edward Hastings The testing of unmanned vehicles presents a need for an independent device capable of accurately collecting position and orientation data. While commercial-off-the-shelf components could be pieced together to sense and record this information, this is an expensive, large, and heavy solution, no...

A cold finger attached to the second refrigeration stage of a DE-201 Displex closed-cycle helium refrigerator has been equipped with a miniature DC motor. The device allows reorientat ion of the crystal at low temperature, without remount ing or warming to ambient temperature. The axis around which the crystal is rotated is inclined by 45 ° to the cryostat axis, which gives a 90 ° change in ori...

background and aims: whole body vibration (wbv) transmitted to drivers is one of the main reasons for several different symptoms such as musculoskeletal disorders. one of the recommendations to decrease the effects of whole body vibration is using a device that acts as an isolator. in this study, we used an air cushion as a device to decrease wbv. we measured whole body vibration transmitted to...

A51-year-old patient presented with a second episode of transient loss of vision. A persistently patent foramen ovale (PFO) was diagnosed with a transesophageal echocardiogram, and percutaneous closure with an implantable device (PfoStar, Cardia, Inc) was done. The PfoStar is a catheter implantable device consisting of 2 polyvinyl sheets spread by 2 crossed nitinol wires. The axis of the left a...