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Moona, Girija
- Study of Stylus Bending Effects on CMM Measurements and its Stylus Characterization
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Authors
Affiliations
1 Standards of Dimension, National Physical Laboratory (CSIR), Dr. K. S. Krishnan Marg, New Delhi, IN
1 Standards of Dimension, National Physical Laboratory (CSIR), Dr. K. S. Krishnan Marg, New Delhi, IN
Source
Manufacturing Technology Today, Vol 11, No 3 (2012), Pagination: 27-30Abstract
Coordinate Measuring Machines (CMMs) are widely used for a large range of precise measurement tasks. These tasks are expected to be carried out with increasing accuracy, speed and flexibility, as well as the ability to operate under shopfloor conditions. CMM Probe is the interface between coordinate measuring machine and work piece and it is responsible for the coordinate measurement accuracy. The CMM probe acts as a switch by stopping the movement of CMM and freezes the dimensional values os the contact between work piece and probe is made. One of the more prevalent kinds of CMM probes is the Touch Trigger Probe (TTP). TTPs work by sensing the impact of the stylus tip with the work piece. The aim of this study is to determine whether various probe head configurations and probing forces would have an effect on the CMM's ability to repeatedly measure a dimensional feature. During this study it was realized that probing force, stylus shaft length and stylus tip round ness ploys a crucial role in measurement. Relevant data from the study is presented.Keywords
Coordinate Measuring Machine, Touch Trigger Probe, Probe Head Configuration, Probing Force.
- Influence of process variables on surface roughness of 316L stainless steel parts fabricated via selective laser melting process
Abstract Views :55 |
PDF Views:0
Authors
Affiliations
1 National Institute of Technology Delhi, IN
2 CSIR–National Physical Laboratory, New Delhi, IN
3 Indian Institute of Technology Kanpur, Kanpur, IN
1 National Institute of Technology Delhi, IN
2 CSIR–National Physical Laboratory, New Delhi, IN
3 Indian Institute of Technology Kanpur, Kanpur, IN
Source
Manufacturing Technology Today, Vol 22, No 1 (2023), Pagination: 33-38Abstract
Selective laser melting process (SLM) is a metal additive manufacturing technique with excellent design freedom and feasibility. In SLM, a high-energy source is used to melt powder particles into a pattern of successive layers. However, the major challenge associated with the SLM process is that the parts have a high surface roughness (Ra) compared to forming, machining, and rolling processes. In this paper, the core parameters, including scan speed, hatch distance, laser power, and energy density effects discussed as the roughness parameters. The experimental runs were designed based on Taguchi L9 orthogonal array. The results displayed that Ra of samples was largely affected by laser power as compared to scanning speed and hatching spacing. The Ra of samples achieved less at high energy density. In contrast to other surface finishing operations, the polished sample showed the average Ra value of 0.049 μm manufactured at an energy density of 58.83 J/mm3.Keywords
Selective Laser Melting, Process Parameter, Energy Density, 316L SS, Surface Roughness.References
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- Aqilah, D. N., Farazila, Y., Suleiman, D. Y., Amirah, M. A. N., & Izzati, W. B. W. N. (2018). Effects of process parameters on the surface roughness of stainless steel 316L parts produced by selective laser melting. Journal of Testing and Evaluation, 46(4), 1673-1683.
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