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Thanks for your input, everyone. I really appreciate it. I think we're going to go with all galvanized hardware (no lock washers). We're pretty sure that with the torque applied in our assembly process it should hold up in the field.

TVP: thanks for the links and the clarification.

Greg, Thanks for the comment. I hadn't heard of Nord Lock washers before. I looked them up, and unfortunately I think they will be cost prohibitive for our application.

racookpe1978, thanks for the suggestion. Unfortunately, SS is going to be cost prohibitive in this application. We have a ton of connections on this thing, and we're up against some very tough competition. Using SS hardware would kill our margin on this thing (which is already small). Also...

Hey everyone, I have a conundrum regarding hardware for a wheel used in pivot (agricultural) irrigation systems. These wheels have several polymer segments that bolt to an inner galvnized steel wheel. The hardware that we had traditionally used was zinc-plated, but as you can probably guess...

Thank you, everyone, for all the responses. I appreciate it!

Hi everyone, I have a question regarding shipping steel parts overseas and corrosion. My company currently purchases a large wheel, made from AISI 1018 steel, from a Chinese supplier. This wheel is fabricated from a steel hoop and a stamped steel center hub, which are then welded. The...

Thank you again for the additional responses. Much appreciated!

Thank you all for the responses - I do appreciate it. There's been a lot of good discussion here about what is and isn't patentable. But if I could steer the conversation a bit, I'd like to ask some of you specifically if you would be comfortable signing a patent application for either of...

Hi everyone, I need some advice on signing a potential patent application in a rather complex situation (apologies if this thread is in the wrong section - I couldn't find a more applicable one). I'll describe the situation: My company makes wheels for pivot irrigation systems. Part of this...

Thank you again for all the responses. I'll try to remember to post an update in the future when we get this issue sorted out.

Thanks for the tip on Stage 8. I'll check them out. I have confirmed that the chamfer used on the irrigation system lug nuts (at least all the ones I've seen so far) is 45°. The center hub fits through the center pilot hole with a slip fit, so there is some centering action there, at least...

The steel wheels don't have any belleville washer profile. It's just a T-wheel with chamfered holes. See attached/linked picture.http://files.engineering.com/getfile.aspx?folder=eca545d0-2bf2-4855-81fa-71456a252369&file=Pivot_wheel.jpg

Thank you all for the responses. I really do appreciate it. I'll try to use what you've said as ammunition to convince my boss that we need to remove the powder coat on the bevels. Just for clarification: these pivot wheels are going on someone else's pivot irrigation system, usually...

Hi everyone, I have a problem that I inherited from a previous designer that I need help with. My company currently builds wheel assemblies for pivot irrigation systems (among other things), and our current design utilizes a steel T-wheel that is powder coated. The bolt holes in the wheel...