[To...] Posted July 19, 2021 Share Posted July 19, 2021 I'm looking for ideas on a good way to tell the customer the helical slot on their part is good. SInce I can't do position of a curve, I'm leaning towards a Line Profile with a 0.050 tolerance. Also considering a series of symmetry points along the helix.Screenshot 2021-07-19 132415.jpgScreenshot 2021-07-19 131406.jpg Link to comment https://qualityforum.zeiss.com/topic/12466-position-of-helical-slot/ Share on other sites More sharing options...
[Ro...] Posted July 19, 2021 Share Posted July 19, 2021 Assuming you're fixturing the part with the cylinder body Vertical to the table..... Take 2 cylinders in the slot ends (i know, wall thickness is only 1MM thick) and intersect them to the outer surface of the part so you have a "pierce point" that are a nice clean 90º apart, you could align 1 to say the X axis and 1 to the Y, then your nominals for the ends will be Z [BOX] Y 0 and Z[BOX] X 0. Then you could snap a 3d line between the 2 points, and a 2ndary alignment rotated 45º would provide a theoretical point between the ends, but it wont be at the surface, but it should be at Z 1/2 [BOX] Y 0 Does that make sense? Link to comment https://qualityforum.zeiss.com/topic/12466-position-of-helical-slot/#findComment-62448 Share on other sites More sharing options...
[Jo...] Posted July 20, 2021 Share Posted July 20, 2021 Please sign in to view this quote. I would try to section it cylindrically using curve and extract a 3D line all around the slot. Hopefully, you won't have to use more than 1 stylus tip. Link to comment https://qualityforum.zeiss.com/topic/12466-position-of-helical-slot/#findComment-62450 Share on other sites More sharing options...
[Ma...] Posted July 20, 2021 Share Posted July 20, 2021 I think this is most suitable for rotary table. With it you could do 3d line ( cut model with cylider ). Create bestfit alignment and make theoretical point with this alignment. This could work for case without "M". I don't know if you can place formula to tolerance input. Link to comment https://qualityforum.zeiss.com/topic/12466-position-of-helical-slot/#findComment-62452 Share on other sites More sharing options...
[An...] Posted July 20, 2021 Share Posted July 20, 2021 Please sign in to view this quote. A helical slot cannot be considered as a feature of size. Use the "Straightness of a constrained Line" in order to achieve a reasonable result without (M). Link to comment https://qualityforum.zeiss.com/topic/12466-position-of-helical-slot/#findComment-62454 Share on other sites More sharing options...
[Me...] Posted July 20, 2021 Share Posted July 20, 2021 Please sign in to view this quote. Sure it can, the helical slot can be considered an “Irregular Feature of Size". The (M) modifier within the position FCF is only indicating that no portion of the slot surface may violate the virtual condition boundary. Use of the line profile characteristic set to “Inwards to Infinity” along the appropriate tolerance will satisfy the location requirement. Link to comment https://qualityforum.zeiss.com/topic/12466-position-of-helical-slot/#findComment-62456 Share on other sites More sharing options...
[An...] Posted July 20, 2021 Share Posted July 20, 2021 _ Link to comment https://qualityforum.zeiss.com/topic/12466-position-of-helical-slot/#findComment-62458 Share on other sites More sharing options...
[To...] Posted July 21, 2021 Author Share Posted July 21, 2021 Please sign in to view this quote. Extract 3D line?….. by recalling points from curve? Link to comment https://qualityforum.zeiss.com/topic/12466-position-of-helical-slot/#findComment-62460 Share on other sites More sharing options...
[Ri...] Posted July 21, 2021 Share Posted July 21, 2021 It would be a 3d Curve. I don't know so much about trying to create a 3d Line. Maybe we should ask the Zeiss Devs to add an "unwind" button. This drawing looks fun. Let's keep it civil in here..................... Link to comment https://qualityforum.zeiss.com/topic/12466-position-of-helical-slot/#findComment-62462 Share on other sites More sharing options...
[Ma...] Posted July 21, 2021 Share Posted July 21, 2021 Please sign in to view this quote. Someone could add this as new feature to "My voice" Link to comment https://qualityforum.zeiss.com/topic/12466-position-of-helical-slot/#findComment-62464 Share on other sites More sharing options...
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