[To...] Posted September 10 Share Posted September 10 Can anyone explain the difference between these two options in a Position characteristic?position options.JPG Link to comment Share on other sites More sharing options...
[Ke...] Posted September 10 Share Posted September 10 Please sign in to view this quote. (P) is for Projected Tolerance Zones Gotta double click to open and define settings Link to comment Share on other sites More sharing options...
[Du...] Posted September 10 Share Posted September 10 maybe these will help, https://www.gdandtbasics.com/projected-tolerance-zone/Screenshot 2024-09-10 105839.jpg Link to comment Share on other sites More sharing options...
[To...] Posted September 10 Author Share Posted September 10 This really doesn't explain the difference between the two. The default is Projected tolerance zone and is equal to the length/depth of the cylinder, which is what I would consider "normal" or the "standard". I understand if the drawing calls for a projected tolerance zone beyond the considered feature, that this must be additionally defined. Maybe my question should have been what does it mean by "calculation of centerline"? Is this an ISO vs AMSE issue? Link to comment Share on other sites More sharing options...
[Ke...] Posted September 10 Share Posted September 10 Please sign in to view this quote. Ah; yes, that is a different question: https://www.gdandtbasics.com/iso-vs-asm ... tolerance/ I presume that Calypso uses the ISO calculation, by default. I'm not aware of a way to toggle between ISO & ASME (using Calypso2021) Link to comment Share on other sites More sharing options...
[Da...] Posted September 11 Share Posted September 11 Please sign in to view this quote. I don't have it by my hand, try to find a video from Zeiss guy Archimedes Ison talking about this. Post the link if you find it. Link to comment Share on other sites More sharing options...
[Mi...] Posted September 11 Share Posted September 11 I am fairly sure its the same idea as perpendicularity of a cylinder, ASME vs ISO ASME uses the (P) button as it uses the axis of the cylinder, calculated based on whatever evaluation setting you choose ( Technically should be OTE but that's a different discussion). But this does let you use a Projected Tolerance zone like mentioned if it applies, but otherwise the zone defaults to the length of the Cylinder, perpendicularity works the same way. ISO uses the Derived Median Line (Cylinder with Form). And I would guess that if an ISO drawing wanted a projected tolerance zone there would be modifiers on the drawing that tell you how to change the evaluation method to satisfy the requirement. Link to comment Share on other sites More sharing options...
[Ma...] Posted September 11 Share Posted September 11 I think that on the left is real length of scanned feature and (P) is used as defined nominal or if drawing define it. It works like you scan a thread, but it will not give you info about assembly, so you prolong that TP to place where you have bolt head for example. Link to comment Share on other sites More sharing options...
[To...] Posted September 12 Author Share Posted September 12 Are you guys saying that when selecting the Projected tolerance zone, it is following the ASME methodology? Seems to me, the P option is strictly for creating an evaluation outside of the feature's own geometry but still using a derived median line. I don't believe Calypso has ever considered the ASME methodology in any setting, until 2023 when using the beta system maybe. Am I wrong? Link to comment Share on other sites More sharing options...
[Mi...] Posted September 12 Share Posted September 12 Please sign in to view this quote. That's exactly what I'm saying. P uses the calculated axis defaulted to the length of the cylinder, NOT derived median line, so AMSE compliant. The Cylinder with form option uses the Derived median line, which is ISO. It's in the cookbook like that too with a basic explanation. If Zeiss wanted to make it less confusing they would name is better, P can be used to project the tolerance zone, but it doesn't have to. Link to comment Share on other sites More sharing options...
[To...] Posted September 12 Author Share Posted September 12 Please sign in to view this quote. I'm not buying it. Especially due to the topic of applying a projected tolerance zone in ISO. However, since I haven't seen a cookbook since 2018, I don't know what it shows now. I agree, why would you add the confusion of using the P icon option for a position that didn't need a projected tolerance zone? Since it is the default setting, most people probably don't even notice until they have a call out on the drawing. Does everyone that uses ISO automatically click the derived median line icon? If it was meant to be a differentiation between ISO and ASME, identify it as such. Leave the P icon for the calculation of an actual projected tolerance zone, regardless of the evaluation. Link to comment Share on other sites More sharing options...
[Ma...] Posted September 12 Share Posted September 12 Please sign in to view this quote. I am keeping (P) check since it will check for nominal length of a cylinder ( i scan 2mm from edge, sometimes you can not scan whole length ) Link to comment Share on other sites More sharing options...
[To...] Posted September 23 Author Share Posted September 23 I stand corrected. The forum was correct again. https://portal.zeiss.com/knowledge-base?id=2615475 Link to comment Share on other sites More sharing options...
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