-I need to measure a gap feature of an assembly. The gap specification is 0.010" +/- 0.002". The gap feature cannot be directly measured without cross-sectioning (destructive).
-One potential way to calculate the gap is to measure length of two components of the assembly. The difference...
Hi There:
We did a bias study on a CMM machine using the reference value representing the expected range for the parts that are measured. The average bias is -0.0002" or 16% of the process variation (total variation row of the Study Var (6*SD) column from Gage R&R study). The P-value for the...
Hello All:
I am working on the set-up of a machining process in order to meet 0.30000" inner diameter with +/- 0.000080" tolerance. The plan is to measure the inner diameter with CMM. The following tasks were performed.
(1) Performed a repeatability study using a ring gage on the CMM...
Hi there. Have anyone done a Gage R&R study for surface profile for instance 0.005"|A|B|C? Would you use the min deviation, maximum deviation, or 2X worst case deviation as the response for the Gage R&R study? Any thoughts is greatly appreciated.
Traditionally a non GRR is performed using n=10 parts, three operators, and three trials. For a GRR for surface profile, would you use the same set-up as mentioned previously and the response measured would be the maximum or minimum deviation? To calculate % tolerance, the 6-sigma of measurement...
Surface profile can be used to simultaneously control different geometric tolerances. For instance 0.002"|A|B can be used to control form, location, and position. How would you address process performance/capability of such GDT callout? How would you know that you need to improve location but...
Any thoughts on the method to determine a sampling method in measuring a 5 lobe circle? In other words, I would like to determine min # of point to measure a 5 lobe circle using laser micrometer/CMM such that the sampling method is capable of detecting lobe amplitude with high %. Thanks.
Hell All: I am going to conduct a Gage R&R study on CMM touch probe machine (software is PC-DIMS). The feature that will be measured is maximum inscribed diameter, which is tricky depending on the spots on the circle where the points are obtained. How do you determine a sufficient/adequate...
To determine a cutoff length for surface roughness measurement, the idea is to exclude waviness in the surface roughness measurement. But, how can in determine what cutoff length to use?
Thanks
I am working on a heat treatment project which require a comparison of a profile measurement of a surface before and after the heat treatment process. How can I perform a statistical analysis to compare the profile of a surface before and after?
If an ID is defined as Datum B with RFS on a drawing, can the Datum B be used as a secondary datum for a different feature on the same drawing with MMC call out for Datum B?
I am comparing two designs by evaluating the load vs extension curves. I want to show that the new design is equivalent or better than the old design. How can I accomplish the comparision by comparing two load vs extension curves?
I am working with a Generalized Full Factorial Design with factor A and B. Factor A has three levels and factor B has three levels as well. Three replicates were used for a totoal of n=27 runs. The ANOVA model only shows that factor A is significant with a P-value of 0.009. I believed the model...
I came across a surface profile call out. It associates with a basic dimension too. What is the relationship between the basic dimension and the surface profile?
I am working on a measurement method of an outer diameter of a shaft of 0.200" in length. The OD tolerance is +/- 0.00002. The shaft will meet with an inner diameter (bore) of a different part. I'm currently taking OD measurement using a laser micrometer at the following locations:
Multiple OD...
How you would measure compressed spring outer diameter? The spring free length is 0.150". OD at free length is 0.120". Wire diameter is 0.060". ID is 0.100". Material is stainless steel. I would like to compress the spring at 0.050" and measure the OD expansion. What would be an accurate way to...
I would like to measure the outer diameter of a spring (0.130" ID and 0.030" wire thickness) at free state and measure the outer diameter again when it is compressed at 0.050". Any thoughts as to how to measure the outer diameter of the spring at compressed state? I'm interested to find out...
