My 1970 Chop Top Volksrod Build Thread

[V8Nate]

Thanks:)

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[Ol'fogasaurus]

Got looking at the front page again and I saw something that needs to be fixed. There is a post of some kind with what looks like a ragged hole in it but it is the bolting of the brackets that bothers me. Those bolts are under improper angle loading of the bracket and could easily break in the threaded areas.

Lee

[V8Nate]

What picture is that?

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[Ol'fogasaurus]

79610c5179aed1b21e6af78b270a3039.jpg

The angle is unsupported, and the fasteners are in not only at an unsupported angle, but the threads are not supported. A bolt with a "shank" (the non-threaded area) is there for a certain amount of shear loading... threads are not for either shear or angle loading as they would fail fairly easily.

A fastener with "cut threads" are not as strong as a fastener with "rolled threads" as the cut threads cut the grain of the fastener while the "rolled threads" squish down the grain (no pix) but not separating the grain (I hope this makes sense).

https://superiorthread.com/what-is-thre ... ly%20break.

I hope this helps.

Lee

[V8Nate]

I see what you mean. This was a quick hit and run get it done job to get a very light decklid on the back of it. It could definitely be built better but I don't think it will before this chassis gets a new body tbh but thanks for pointing out a possible failure

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[Ol'fogasaurus]

That is often referred to as "tack together for a fit check".

I've done it myself but only for a fit check as it was my job to know better and stop other "fit checks" on airplanes.

Fasteners are designed to be pulled in a straight line, not at an unsupported angle(s). The mounts for this complicate the designs but do strengthen the situation also. I've seen fasteners fail at very bad/dangerous times.

The unthreaded part of a bolt is stronger but then the bolt material and design add into the strength also.

Lee