Creo Parametric - Cosmetic Threads [Tutorial]

[@kalle6850]

im getting delusional using creo but this helped me great tutorial 👍

[@botrox1984]

Please tell about motion skeletons and about Creo Schematics. It would be interesting.

[@CADPLMGuy]

Thanks for your comment. I am going to do more mechanisms videos. I covered Motion Skeletons in my book "Top Down Design in Creo Parametric." However, I recommend creating multiple skeletons with mechanism connections over Motion Skeletons - the functionality is hard to get right and the motion is limited to 2D. I will do videos on both.

[@marcelvanvilsteren4826]

One question: When I make a DRAWING and have a cross section with thread showing there, I need to have the thread indication line IN the material as a thin CONTINUOUS line.. not as a hidden line (which it shows to be now). How do I change the line style in the drawing from hidden to thin continuous for the thread indication lines which are residing in the material?

[@CADPLMGuy]

Have you tried the Edge Display command?

[@marcelvanvilsteren4826]

@@CADPLMGuy Yes I tried. That does not work. We make PDF files of the drawings we make. Inside threads (holes) in the PDF it show a dashed / hidden line. The standard (ISO) demands a thin continuous line in a cross section and only a hidden line when it shows in a view or detail (not cross-sectioned view). Outer thread would be a continuous thin line in both a view and a cross-section and only dashed when it is hidden in a view behind another part of the solid.

[@CADPLMGuy]

I recommend opening a ticket with PTC if you haven't done so. I'm not well versed on ISO drawing standards.

[@MartinezRBA]

Why I cant match a 1/2-13 UNC cosmetic thread with a 0.42 inch hole? It is supposed to be the correct diameter for the drill. Please help.

[@CADPLMGuy]

I’ll have to check the UNC hole file, but in the past I’ve had issues when the hole diameter in the model didn’t match out to a ridiculous number of decimal places (4 I believe). Try a diameter of 0.4219.

[@CADPLMGuy]

This is interesting: the Creo default values matched on holes of 0.421, 0.4219 (the value in the hole file), and 0.422 diameter, but not 0.420 or 0.423. I'll check if there is a specified tolerance in which the hole will match the thread.

[@MartinezRBA]

@@CADPLMGuy after writing my last comment i tried with 0.422 (3 decimal places) and it actually worked. I was not very sure why but now I know. Btw all feedback is appreciated, thanks!

[@CADPLMGuy]

Brandon, I just found the config option: cosmetic_thread_match_tolerance. Default value is 0.001 inches, which explains why it didn't match the 1/2-13 to the .42 diameter hole. You can either (1) create your own .hol files and direct Creo to them with hole_parameter_file_path or (2) increase cosmetic_thread_match_tolerance to something like 0.002. The latter is much easier.

[@MartinezRBA]

@@CADPLMGuy very very useful information, thank you again sir.

[@Miguel_Seabra]

Is there any way to automatically adapt the thread geometrically to the existing geometry? For example, if I have a part with a thickness less than the thread.

[@CADPLMGuy]

You can write Relations that control the diameter of the thread as a function of the surface on which it is placed. I will try to put together a quick video to see if that meets your intent.

[@Miguel_Seabra]

@@CADPLMGuy Thanks for the quick response. What I wanted to say was that if the thread depth is greater than the part if there is any way the thread itself can adjust in depth? I use a UDF with a single hole and a thread to be able, through a ratio, to manage the two diameters and depths relative to the diameter of the screw, works well but when the thickness of the part is smaller than the depth of the thread, which is defended by a relation, stands out and confuses in drawings 2d. If I use holes with tread , standard holes, the thread works the way I like it but I can not manage the diameters through a relations. Thanks.

[@CADPLMGuy]

Miguel, I started making the video before I saw this response, but I think this video addresses your issue by showing how to create a Datum Analysis Feature and using its parameter in a Relation. kzbin.info/www/bejne/ooionqaoeLeXg6s Let me know if this helps.

[@MiklaDfar]

Let's be honest. Thread features in Creo SUCK. A "cosmetic" thread that does not look like a thread is NOT 2021 type of technology. This is VERY disappointing from a company like PTC. There are MANY cases where threads are need and NEED to be shown, not every threaded feature is a nut, bolt or threaded hole for a fastener. How about moving into this century and providing the ability to created MODELED threaded features easily (and I DON'T mean helical sweep). I mean Fusion 360 does it, is it too hard for PTC? BTW, I was responsible for the FIRST $1M sale in the history of PTC way back when so I have always been an avid PTC supporter... but you appear to be losing that innovation drive and turned to a purchase technology business model...