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In "most" weldment processes. You weld first. Then machine. For a simple round shaft welded to anything. it tends to bow like a banana, you must then put it on a lathe to true it. and if you want threads , it is done last ....usually.
Hello! We manufacture hydraulic cylinders and we thread the cylinder tubes always after some welding operations. It's all about plugging the hydraulic cylinder ends. We screw-thread the cylinder tube ends internally and connect the ends with a plug and hydraulic seals. It means that high tolerance on sealing and threading surfaces inside the tube is a must. The cylinder tube has commonly a welded port/ adapter very close to the threads and the sealing surfaces. The welding operation will always change the size & shape of the machined surfaces and threads, when close enough. Therefore it is clever to do the machining operations with threading after the weldment to prevent jamming of the threads or sealing failure because of uneven sealing surfaces. No idea if the picture, I attached, is to see.
If you work with precision engineering which involves welding and machining you would understand the issue. Some parts needs to be welded on bigger or smaller and afterwards machined to the correct size. A good example is a cylinder, if your cylinder is not true it will jam in the barrel and cost a fortune to fix.
See below before and after pics of cylinder as well as work-around method which is time consuming and not ideal.
Welding stage:
Machining stage & Thread
Workaround method (the thread needs to be suppressed on your fabrication drawing):
Thanks for the replies I have a better understanding.
I have designed flight simulators so precision is key. But we have never ran into issues with our shafts welded to plates. We always made press fit to the plate to ensure the precision and face off the plate after welding to true the plate to the shaft rather the other way around..
We can't dictate welding/manufacturing procedures for other companies. Too many variables to possibly think one solution fits all. We have had many examples from users where this feature is needed, Autodesk and us need to trust them that they are doing what is best for their circumstances. The question now is not why we should have this feature, because it is accepted, but what will it take for Autodesk to get it implemented. I hope they are making it a priority because it sounds like people have needed it for a long time. Dan
In my company the BOM is key to use ordering the correct amount, type & length of materials. Step 1 - to make a rod with an external thread I create an assembly file and place the rod from the Content Centre which populates the BOM.
Step 2 - is to apply a male (external) thread and this is where this feature is needed as it can't be done at the assy level. I have to enter the rod part level to do the thread an then return to the assembly level.
Step 3 - the IDW (drawing ) is then created at the assembly file level but the mass can be wrong as the part that created the BOM (raw material) has been edited and reports that mass instead of the raw un-machined material mass.
Thread support for weldments/assembly is currently being Alpha tested & discussed in the NDA based Inventor Feedback project. If you don't already have access to the feedback project & you would like to try the Alpha & provide feedback then you can apply for access using this link:
This idea has been implemented within Autodesk Inventor 2020. You can now apply an internal or external thread feature to cylindrical face within an assembly or weldment. Special thanks to everyone who cast a vote for it.
Belated thanks to Autodesk developers for this much needed addition.
However the fact that it's taken 6.5 years from first conception should be considered a complete failure. Autodesk, you need to listen more and act quicker. As a paying subscriber I expect more from these fixers instead of the plethora or new features I won't use.
Our cam programmer yesterday tells me the tap drill size is wrong for NPT threads in the hole command. I didn't believe him as how could those be wrong but sure enough I look in the thread file and they are all wrong. We're using 2018 and just installed 2019 so I figured they would fix something that easy but no 2019 has the same incorrect values. Solution I find online, change the thread file yourself. Lol.
You can create a thread in an assembly or in a weldment. It would depend on your product. I am creating a captive screw replacement due to lead times with two of our vendors. I want to purchase a #10 x 1.25 long socket head cap screw, then modify down to an #8 with a retaining ring groove and a smaller diameter shank. Due to existing product I am required to keep the head of the screw and the socket as a #10. I have made all of my modifications in a sketch including a fillet and chamfer (because you cannot do those in an assembly either). It seems strange that not all options are available. Someone will come up with a new idea that has not been done before and will be unable to create it due to the limited nature of Inventor.
