[Wi...] Posted May 1, 2020 Share Posted May 1, 2020 I have some standards Im measuring that are basically the shape of a bullet. Its close to a cone but its really a great big radii. Ive been checking dim b and just treating the radii like a cone and using cone calculation. I then use the vision system to verify my results. Do you guys see a problem with how im measuring this part and if so do you have any suggestions?284_Ex.JPG Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/ Share on other sites More sharing options...
[Da...] Posted May 1, 2020 Share Posted May 1, 2020 Cone Vs Bullet It is adding some amount of error.Capture.JPG Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86766 Share on other sites More sharing options...
[Da...] Posted May 1, 2020 Share Posted May 1, 2020 Can you use the circle on a Sphere?Capture.JPG Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86768 Share on other sites More sharing options...
[Wi...] Posted May 1, 2020 Author Share Posted May 1, 2020 Yes.... im about to try that now. Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86770 Share on other sites More sharing options...
[Da...] Posted May 1, 2020 Share Posted May 1, 2020 That would require the shape to be sphericalCapture.JPG Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86772 Share on other sites More sharing options...
[Wi...] Posted May 1, 2020 Author Share Posted May 1, 2020 They are checking real close with cone calculation. I just want to explore a different method. Thank you Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86774 Share on other sites More sharing options...
[Da...] Posted May 1, 2020 Share Posted May 1, 2020 The other would be a Circle on TorusCapture.JPG Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86776 Share on other sites More sharing options...
[Da...] Posted May 1, 2020 Share Posted May 1, 2020 Are you working with a model? If so what does it extract as Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86778 Share on other sites More sharing options...
[Wi...] Posted May 1, 2020 Author Share Posted May 1, 2020 yes.... it pulls a torus. Think about doing a 2d curve and intersection i just have to figure out where the Dim b occurs Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86780 Share on other sites More sharing options...
[Da...] Posted May 3, 2020 Share Posted May 3, 2020 With a Curve your vector will be wrong. It will not be nominal vector to the surface. You will end up with cosine error. The error will depend on the angle of probing vs nominal vector to the surface. I have a question they don't define the Dim of B. They are setting only the Dia for the circle? Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86782 Share on other sites More sharing options...
[Da...] Posted May 3, 2020 Share Posted May 3, 2020 You will need a formula. Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86784 Share on other sites More sharing options...
[Wi...] Posted May 4, 2020 Author Share Posted May 4, 2020 Correct.... where does said diameter occur.... Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86786 Share on other sites More sharing options...
[Wi...] Posted May 4, 2020 Author Share Posted May 4, 2020 Thanks for the help. I figured it out Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86788 Share on other sites More sharing options...
[Wi...] Posted May 4, 2020 Author Share Posted May 4, 2020 Be nice if zeiss came up with something like cone calculations for the obscure cone shape.... I wound up using the vision system and offsetting the midline half the stated diameter and intersecting the cone. I then verified that on the cmm.... Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86790 Share on other sites More sharing options...
[An...] Posted May 5, 2020 Share Posted May 5, 2020 Please sign in to view this quote. See attached.Contribution_05_05_2020_.pdf Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86792 Share on other sites More sharing options...
[Ma...] Posted May 5, 2020 Share Posted May 5, 2020 This may not help you with the measurement but the shape of the object you are showing is called an ogive. https://en.wikipedia.org/wiki/Ogive Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86794 Share on other sites More sharing options...
[Kl...] Posted May 6, 2020 Share Posted May 6, 2020 The CAD department makes the drawing and are able to define and show the missing values. My opinion, without the missing values its not possible to produce the part. The inspection contain two methodes to get the result and the difference between the solutions. My fault, I should read everything. I've now integrated both conditions - diameter at height - height at diameter Local results are different according to the form deviation and Gaussin circle versus the curve calculation. The influence of the dimension (radius) and the position (center) can only be checked on a real part. The function relevant zone correctly described by Andreas, could be the next step, if a higher accuracy (smaller tolerance) is needed. CALYPSO 6.6 Run it by Simulation. Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86796 Share on other sites More sharing options...
[An...] Posted May 6, 2020 Share Posted May 6, 2020 Further insights. See attached.Contribution_06_05_2020.pdf Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86798 Share on other sites More sharing options...
[An...] Posted May 6, 2020 Share Posted May 6, 2020 Deleted ! Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86800 Share on other sites More sharing options...
[Da...] Posted May 9, 2020 Share Posted May 9, 2020 Please sign in to view this quote. Not that Formula. Link to comment https://qualityforum.zeiss.com/topic/15842-cone-calculation-on-a-radius/#findComment-86802 Share on other sites More sharing options...
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