New threaded shroud design
I was recently asked by a member here if I could make a shroud that threaded onto the frame adapter. The adapter would stay in the frame, but the shroud tube will come off. I started on this a week ago, and at first I though it just wasn’t going to happen, because the threads have to be so fine. I searched through Machinery’s Handbook to see if I could find a standard thread that worked with the wall thickness and tube diameter, no such luck. So I had to base my thread off of a standard thread to make it work. To sum it up, after some fiddling and small cuts, I got the threads to fir together, and very nicely I might add. I wrote down all the measurement of the threads I made, so i can duplicate them in the future. Here is how it turned out.






I still need to find a finish that is very durable and looks good to. Any suggestions would be appreciated.
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Nice work,
May I ask why you decided to create a thread to deal with the thin-walled tubing rather than put a bushing in the end of the tube that you could thread? Any weight increase from the bushing would be offset by a reduction in the weight of the adaptor on the frame.
Better yet, why not turn a bushing to fit inside the frame and then thread it (female) and then neck down the extension and thread it (male) so that it threads into the frame. By doing that you can also thread a regular cap to fit into the stock shroud, and when the extension isn’t being used it’ll all look stock.
Of course I don’t know why someone would want to thread it into the frame rather than slide it in, but I’m assuming that the customer has a need.
Jimbo – who has many days where he can’t turn a cylinder!