[Cl...] Posted April 29, 2021 Share Posted April 29, 2021 Can someone (in layman's term's) explain Band Pass filter? Link to comment Share on other sites More sharing options...
[Ri...] Posted April 29, 2021 Share Posted April 29, 2021 https://en.wikipedia.org/wiki/Band-pass_filter It short, it allows you to pick a frequency, and kicks out the data above, and below it. Where as a high-pass allows data above a certain frequency, and a low-pass allows data below a certain frequency. I believe it is mainly used for measuring Waviness. https://www.rlguimont.com/wp-content/up ... tliers.pdf Link to comment Share on other sites More sharing options...
[Ch...] Posted April 29, 2021 Share Posted April 29, 2021 Finally my subwoofer days have paid off. Richard pretty much said it. you choose what frequency bandwidths that you want and everything else, above and below, gets filtered out. Link to comment Share on other sites More sharing options...
[Cl...] Posted April 29, 2021 Author Share Posted April 29, 2021 I have a thin walled cylinder (.010") with a perp callout of .0005 of the face at one end. A manual surface plate check shows it within .0004, but the CMM result is double that. I started playing around with some different settings and it just so happened that the application of Band Pass filter showed what the manual check showed, <.0004". So, I need to know what exactly this filter is doing? Link to comment Share on other sites More sharing options...
[Ma...] Posted April 29, 2021 Share Posted April 29, 2021 Please sign in to view this quote. A bandpass filter would not be appropriate to the task you describe. A bandpass filter would attenuate frequencies (usually described as undulations or wavelengths on physical parts) above or below specified limits. This would attenuate the most basic component of a perp. spec -the tilt. A bandpass filter would be most useful to characterize deviations of form or waviness. Link to comment Share on other sites More sharing options...
[Ow...] Posted April 29, 2021 Share Posted April 29, 2021 _ 😎 Link to comment Share on other sites More sharing options...
[Jo...] Posted April 29, 2021 Share Posted April 29, 2021 Please sign in to view this quote. I'm not questioning your findings, just trying to understand your methods. The end is perp to the cylinder ? I believe in that case, it is the same value as runout. Form is included. If you stood it on end and checked along cylinder on surface plate, that's not the same. Link to comment Share on other sites More sharing options...
[Cl...] Posted April 30, 2021 Author Share Posted April 30, 2021 Really I'm just wanting to know how/what the Band Pass filter setting works/does, and WHY, with it applied does it give me a number that matches the surface plate check? Link to comment Share on other sites More sharing options...
[Ma...] Posted April 30, 2021 Share Posted April 30, 2021 Please sign in to view this quote. Bob Ross might have called it a "happy little accident" Link to comment Share on other sites More sharing options...
[Ri...] Posted April 30, 2021 Share Posted April 30, 2021 Please sign in to view this quote. Link to comment Share on other sites More sharing options...
[Cl...] Posted April 30, 2021 Author Share Posted April 30, 2021 OK, that puts it in a little better perspective, thanks Richard. Link to comment Share on other sites More sharing options...
[Jo...] Posted April 30, 2021 Share Posted April 30, 2021 Please sign in to view this quote. That's great ! In the mechanic lingo the explanation is "it does that" Link to comment Share on other sites More sharing options...
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