• Shahidkhan G. Pathan
• PM George
• VA Pandya

The most important part for machine tool system is spindle housing system. The spindle housing system of precision lathe is one of the main parts of CNC lathe, and also a executive part of the main motion of the machine tool, it directly clamping the work piece and drive it to rotate. the running accuracy directly relate to assembly accuracy. The machine tool accuracy directly affects the dimensional accuracy of the machined products. This study has been undertaken to incorporate GD&T requirements in spindle housing of CNC lathe using Process Capability Analysis(PCA) and Root Cause Analysis(RCA) to ensure the assembly accuracy of the spindle housing system, improve the assembly quality and shorten the assembly cycle. The geometrical requirements to be met by the spindle housing apart from dimensional requirements are: Circularity, Cylindricity, Straightness, Concentricity, Flatness, Total Runout etc. This work depicts the application of GD&T rules and standards to modify the Conventional drawing by incorporating the GD&T characteristics, viz., cylindricity, concentricity, flatness to increase the assembly accuracy and get interchangability. Incorporate geometric requirements in this project work are: Concentricity, cylindricity, flatness. Since they have direct influence on the functioning of the components. In spindle housing, it was found that concentricity of bore plays a major role on the assembly as well as function of the spindle housing system, here, attempts based on the carefully planned and conducted experiments, process capability can be measured. Process capability analysis along with root cause analysis are carried out to eliminate or control the causes of variation in process parameters to improve the manufacturing process capability. Tapered in bore and failure of hydraulic system in honing process was controlled by 5-why analysis and FMEA to improve Cpk value from 0.74 to 1.34 which were contributing for poor process capability. From coordinate measuring machine, the concentricity of 0.05 mm for spindle housing and cylindricity of 0.02 for spindle are found.

GD&T, Spindle Housing, Process capability, assembly, concentricity, cylindricity

"INCORPORATING GD&T REQUIREMENTS IN SPINDLE HOUSING OF CNC LATHE TO IMPROVE THE DESIGN AND MANUFACTURING PROCESS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 6, page no.b126-b146, June-2021, Available :http://www.jetir.org/papers/JETIR2106161.pdf

"INCORPORATING GD&T REQUIREMENTS IN SPINDLE HOUSING OF CNC LATHE TO IMPROVE THE DESIGN AND MANUFACTURING PROCESS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 6, page no. ppb126-b146, June-2021, Available at : http://www.jetir.org/papers/JETIR2106161.pdf