[Jo...] Posted Monday at 05:25 PM Share Posted Monday at 05:25 PM Hey all, I am looking for some input on general 2d curve evaluation settings. I know this may be generic, but I figured I would put out a post. For some background. I have came across a few instances in my company where the same feature in different programs are being filtered differently. the examples below show a 2d curve evaluated with spline with 50 upr and a second instance where it is evaluated with Gauss with Lc 2.6. Appreciate the help! Link to comment Share on other sites More sharing options...
[Jo...] Posted Monday at 07:33 PM Author Share Posted Monday at 07:33 PM Posted in General for more traffic. Link to comment Share on other sites More sharing options...
[Kl...] Posted Wednesday at 01:33 PM Share Posted Wednesday at 01:33 PM Hey, short handout (pptx) Gaussian versus Spline for curves Aditional customized PiWeb Report (pdf), simulated program. Hope it helps Gauss versus Spline.pptx 30.pdf 3 Link to comment Share on other sites More sharing options...
[To...] Posted Wednesday at 03:22 PM Share Posted Wednesday at 03:22 PM Please sign in to view this username. There is a lot to look over on these. Thank you. Did you use step width for determining the Lc in the powerpoint? Link to comment Share on other sites More sharing options...
[Kl...] Posted Wednesday at 04:34 PM Share Posted Wednesday at 04:34 PM Hey Tom problematic is always inside radius. 1st What's the best stylus radius 2nd probe center path defines step distance, minimum 18 points at 90° arc 3rd Determine the break even Lc for spline filter and compare it to Gaussian I found no background inside the standardisation and the used parameters for Spline-Math is also a mystery The result must be plausible. It is best, if I have similar results, e.g. CMM versus form tester. 1 Link to comment Share on other sites More sharing options...
[Jo...] Posted Wednesday at 05:00 PM Author Share Posted Wednesday at 05:00 PM Thank you Please sign in to view this username. ! That is very helpful. Based on the best practice note. For my example, I am measuring a spiral 2d curve. Since the slope tightens towards the center, I should be using Gaussian. Am I interpreting that correctly? Link to comment Share on other sites More sharing options...
[Kl...] Posted Wednesday at 06:27 PM Share Posted Wednesday at 06:27 PM (edited) Hey Joseph the gradient growes up for inner to outer, means not constant. I prefer Gaussian, because it only can get problems at start and end. An adequate overlap (cutoff) solves this. Additional compare the result Gaussian & Spline with same Lc to get a feeling for the behaviour. In order to make more precise statements, I need to know the exact geometry Please look at inspection Klaus Spiral.zip Edited Wednesday at 06:28 PM 1 Link to comment Share on other sites More sharing options...
[Jo...] Posted 15 hours ago Author Share Posted 15 hours ago Thanks Klause, So my print calls for the below Lambda filtering settings in regards to profilometer measurements. Should I be using 0.8mm for my filtering method when it comes to CMM filtering? Link to comment Share on other sites More sharing options...
[Kl...] Posted 14 hours ago Share Posted 14 hours ago Hey Joseph The typical specification of a roughness Evaluation length 4,000 mm Lc = 0.800 mm Ls = 0.0025 mm Samples = 5 Standard CutOff = 1 Measuring length = 4,800 mm There are no specification evaluate the total profile of the spiral Use the spec above, and the number of samplings = MeasuredLenght/Lc Link to comment Share on other sites More sharing options...
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