Surface Finish
Surface Finish
(OP)
Does anybody know the appropriate 'profile of surface' tolerance to achieve a surface accuracy of 0.25mm RMS.
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RE: Surface Finish
you dont say if your part is round or flat. Normaly 0.25 can be acheeved by fine grinding or superfinishing.
RE: Surface Finish
Our customer requires a 0.25mm RMS surface accuracy - the accuracy an antenna assembly is measured by probing approx 500 points and calculating an RMS error.
The reason for the query is that i am trying to equate the RMS value to a 'profile of surface' geometric tolerance to pass on to our toolmaker for machining the form tool surface.
RE: Surface Finish
RE: Surface Finish
RMS Avg. = sq. rt. of ((Ya2 + Yb2 + Yn2)/n)
(the 2 means squared)
The AA average is similar, but does not square the readings and square root the average.