scholarly journals Measurement of The Cycloidal Drive Sleeves and Pins

Mechanika ◽  
2021 ◽  
Vol 27 (6) ◽  
pp. 505-512
Author(s):  
Renata ZARĘBA ◽  
Tomasz MAZUR ◽  
Krzysztof OLEJARCZYK ◽  
Damian BZINKOWSKI
Keyword(s):  
Small Area ◽  
Sufficient Data ◽  
Wear Analysis ◽  
Measurement Strategy ◽  
Measurement Results ◽  
Wear Tests ◽  
Roundness Measurement

In the paper, an issue of CMM measurement strategy of the sleeves and pins designed for wear tests in the cycloidal drive. The measurement strategy was proposed, based on initial out-of-roundness measurement in scanning mode. Proposed approach ensured that the pin was measured along its entire 40 mm length with only small area of fixation ca. 5 mm left out, and all probing points for cylindricity deviation assessment were collected in one fixation. It was demonstrated that the cylindricity and roundness measurement results based on 8, 16 and 48 probing points provided sufficient data for further wear analysis. In some cases, the circles calculated from 4 points gave additional insights allowing to accept the part that otherwise might be possibly rejected.

scholarly journals Making roundness measurement applications and control systems on the Roundness Tester Machine

2019 ◽  
Vol 63 (3) ◽  
pp. 17-21
Author(s):  
Dodi Sofyan Arief ◽  
◽  
Eko Jadmiko ◽  
Adhy Prayitno ◽  
Muftil Badri ◽  
...  
Keyword(s):  
Control Systems ◽  
Measurement Data ◽  
Rotating Speed ◽  
Center Point ◽  
Global Quality ◽  
Measurement Results ◽  
Roundness Deviation ◽  
And Control ◽  
Dial Indicator ◽  
Roundness Measurement

Dial indicator is a comparison device usually used in industrial activities, especially in production. To make measurements at this time must be supported by technology that can facilitate operators when using it and when analyzing measurement results. Involving the programme and microcontroller are a solution to developing in roundness measurement, and then the results can be more accurate or thorough between the readable values read from the measuring instrument with the actual value of varying the amount of data. Roundness application is a program that can input measurement data automatically and can do calculations directly. Then, it can display a reference circle, a table that calculates the values of X, Y, R, X’, Y’, R’, Roundness Deviation, Run out Concentricity or a shift in the center point and also the center point shift or Theta. In measuring roundness, the test object is used the Standard Mandrel which has been certified by PT. Global Quality Indonesia, by determining three points or positions, namely in the first position the amount of data is 180, in the second position the amount of data is 90 and in the third position, the amount of data is 60 with a rotating speed of 15 mm/s. The results of the reference circle can be seen in each calculation in each position, in the second position the roundness deviation values are approaching of the Mandrel.

Wear Analysis of Functionally Gradient Composite Materials by FE Modelling of Microhardness Measurements and Wear Tests

2007 ◽  
Vol 537-538 ◽  
pp. 519-526
Author(s):  
David Felhös ◽  
Karoly Váradi ◽  
Klaus Friedrich
Keyword(s):  
Wear Behavior ◽  
Gradient Material ◽  
Material Structure ◽  
Fe Modelling ◽  
Sem Images ◽  
Wear Analysis ◽  
Functionally Gradient ◽  
Sic Reinforcement ◽  
Wear Tests ◽  
Functionally Gradient Composite

Rollers of three different material structures were examined: rollers consisting of pure EP resin; homogeneous EP/SiC composite rollers containing 5 vol.% SiC; and EP/SiC composite rollers with functionally gradient (FG) material structure. Wear tests were performed on the rollers. The wear tests showed that rollers of gradient structure are the most wear-resistant of all. Microhardness measurements were performed on the materials of the three different rollers. SEM images were made of the surface of wear traces. In order to get to know better the effect of SiC reinforcement particles on the wear mechanism, microhardness measurements were simulated by 3D FE micro-models. The SEM images and the FE models were used to explain the excellent wear behavior of the tread of rollers with gradient material distribution.

Uncertainty Calculation of Roundness by Automatic Differentiation

2010 ◽  
Vol 437 ◽  
pp. 217-221
Author(s):  
Jia Chun Lin ◽  
Michael Paul Krystek ◽  
Zhao Yao Shi
Keyword(s):  
Measurement Uncertainty ◽  
Automatic Differentiation ◽  
Uncertainty In Measurement ◽  
Uncertainty Calculation ◽  
Measurement Results ◽  
Coordinate Metrology ◽  
Data Points ◽  
Roundness Deviation ◽  
Expression Of Uncertainty ◽  
Roundness Measurement

According to the Guide to the Expression of Uncertainty in Measurement (GUM), all measurement results must have a stated uncertainty associated to them. But in most cases of roundness measurement either no uncertainty value is given, or the calculation is not based on the model of the respective association criterion for the geometrical feature, because no suitable measurement uncertainty calculation procedure does exist. For the case of roundness measurement in coordinate metrology, this paper will suggest algorithms for the calculation of the measurement uncertainty of the roundness deviation based on the two mainly used association criteria LSC and MZC. The calculation of the sensitivity coefficients for the uncertainty calculation can be done by automatic differentiation, in order to avoid introducing additional errors by the traditional difference quotient approximations. The proposed methods are exact and need as input data only the measured co-ordinates of the data points and their associated uncertainties.

scholarly journals NiTi Intermetallic Surface Coatings by Laser Metal Deposition for Improving Wear Properties of Ti-6Al-4V Substrates

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Mokgadi Nomsa Mokgalaka ◽  
Sisa Lesley Pityana ◽  
Patricia Abimbola Idowu Popoola ◽  
Tebogo Mathebula
Keyword(s):  
Sliding Wear ◽  
Surface Coatings ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Wear Properties ◽  
Wear Analysis ◽  
Intermetallic Coatings ◽  
Oxidation And Corrosion ◽  
Ti Content ◽  
Wear Tests

The NiTi intermetallic possesses a number of good properties, such as high wear, oxidation, and corrosion resistance. This paper focuses on the deposition of NiTi intermetallic coatings on Ti6Al4V substrate by laser melting of Ti and Ni elemental powder mixtures. The effect of varying the Ti content in the NiTi composition on the microstructure and wear properties of the coatings was investigated. The microstructure of the NiTi intermetallic coatings were characterized by the scanning electron microscope (SEM) equipped with Energy Dispersive Spectroscope (EDS). The wear properties of the coatings were performed under accelerated dry sliding wear tests. The results obtained from the SEM/EDS analysis; show that the coatings consist of Ni and Ti elements from the feedstock, and the NiTi, NiTi2and NiTi3, intermetallic phases. Dry sliding wear analysis revealed that there is correlation between the hardness and the wear rate. The coatings displayed significant improvement in wear resistance up to 80% compared to the substrate.

A CMOS Low-Voltage Super Follower Using Quasi-Floating Gate Techniques

2018 ◽  
Vol 27 (07) ◽  
pp. 1850111 ◽  
Author(s):  
J. J. Ocampo-Hidalgo ◽  
J. Alducín-Castillo ◽  
I. Vázquez-Álvarez ◽  
L. N. Oliva-Moreno ◽  
J. E. Molinar-Solís
Keyword(s):  
High Resistance ◽  
Small Area ◽  
Low Voltage ◽  
Cmos Technology ◽  
Floating Gate ◽  
Process Models ◽  
Cmos Process ◽  
Gain Bandwidth ◽  
Measurement Results ◽  
Improved Performance

A quasi-floating gate (QFG) “super-follower” is presented. The high resistance used by the QFG transistor is constructed by two diodes connected back-to-back, leading to a simple-, temperature-stable- and small-area solution. Expressions for the behavior of the follower are introduced and verified by circuit simulations in LTSPICE using 0.5[Formula: see text][Formula: see text]m CMOS process models, which show an improved performance of the proposed circuit with respect to the original super-follower. To prove the principle, a test cell was fabricated in the same 0.5[Formula: see text][Formula: see text]m CMOS technology and characterized. Measurement results show a gain-bandwidth product of 10[Formula: see text]MHz and power consumption of 120[Formula: see text][Formula: see text]W with a 1.5[Formula: see text]V single supply.

Fabrication and Evaluation of Flowmeter with Focused-Ion-Beam System

2013 ◽  
Vol 389 ◽  
pp. 324-329
Author(s):  
Dae Keun Choi ◽  
Sang Hoon Lee
Keyword(s):  
Silicon Nitride ◽  
Wind Tunnel ◽  
Response Time ◽  
Small Area ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Rapid Response ◽  
Negative Behavior ◽  
Beam System ◽  
Measurement Results

In this paper, we fabricated and evaluated the piezoresistive type flowmeter with focused-ion-beam (FIB) system. The flowmeter body is made up of the low stress silicon nitride, and the nanometer sized piezoresistive layer is deposited with FIB system for the smaller measuring area. The flowmeter is evaluated in the wind tunnel, and the 0~4m/s air flows are applied. Although the sensitivity, ΔR/R shows the negative behavior unlike the conventional piezoresistive layer due to the added materials during the FIB process, the measurement results show the ΔR/R has a suitable sensitivity (-1.04E-2/ms-1) and a rapid response time (0.8sec). Those results represent the fabricated piezoresistive type air flowmeter has the possibility for the small area detection.

A Study on Fast Geometric Form Measurement of High Precision Balls

2014 ◽  
Vol 1017 ◽  
pp. 669-674
Author(s):  
Hui Zong Lu ◽  
Zhi Wei Wang ◽  
Qian Fa Deng ◽  
Bing Hai Lv ◽  
Fen Fen Zhou ◽  
...  
Keyword(s):  
High Precision ◽  
Online Application ◽  
Diameter Variation ◽  
Measurement Results ◽  
Data Points ◽  
Ball Diameter ◽  
Multiple Measurements ◽  
Set Up ◽  
Dual Probe ◽  
Roundness Measurement

A dual probe non-contact ball roundness measurement method is presented in this paper. With two probes aligned in opposite directions, the direct measurement of diameter variation can be obtained. The relationships between diameter variation and out of roundness of a precision ball are discussed. Attempts of error separation using multiple measurements are carried out and the eccentricity of ball and spindle axis is measured. Measurement results indicated that other than the spindle radial run out, which is synchronous in nature, there also exists high frequency non-synchronous variations. Such non-synchronous errors can be effectively eliminated with the dual probe arrangement for diameter variation measurement. The measurement results showed that such set up is capable of measuring high precision balls for diameter variation and out of roundness with uncertainty of less than 10nm. Single measurement can be completed in 10 seconds with over 10,000 data points. Faster measurement is possible with improved air bearing spindle. The method is suitable for online application of precision ball diameter variation and out of roundness measurement.

Design of a 9-bit column-parallel ADC in the MAPS for real-time beam monitoring

2022 ◽  
Vol 17 (01) ◽  
pp. C01021
Author(s):  
B. Cao ◽  
Y. Wang ◽  
Y. Wen ◽  
Y. Tian ◽  
J. Liao ◽  
...  
Keyword(s):  
Small Area ◽  
Cmos Process ◽  
Effective Number ◽  
Signal To Noise ◽  
Fully Differential ◽  
Differential Nonlinearity ◽  
Active Pixel ◽  
Measurement Results ◽  
Integral Nonlinearity ◽  
Beam Monitoring

Abstract This paper describes a 2 Msps 9-bit column-parallel ADC for monolithic active pixel sensor. It is designed in fully differential cyclic architecture and takes eight clock cycles to perform a 9-bit conversion. This ADC is fabricated in a 130 nm CMOS process. Each ADC covers a small area of 100 µm × 300 µm and consumes ∼5 mW. The measurement results show that this ADC has a signal-to-noise and distortion ratio (SNDR) of 46.8 dB. The DNL (Differential Nonlinearity) and (Integral Nonlinearity) INL are 0.168 LSB and 0.112 LSB, respectively. The effective number of bits (ENOB) is 7.48 bits.

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