Thread: SPI Wheel coupling cracking like crazy!
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Unread 24-06-2002, 00:56
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Join Date: May 2001
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Re: SPI Wheel coupling cracking like crazy!
Posted by Erik Justen at 2/19/2001 2:12 PM EST


Engineer on team none from none sponsored by The Ohio State University/looking for one.


In Reply to: SPI Wheel coupling cracking like crazy!
Posted by Eric Reed on 2/15/2001 7:36 PM EST:



We too had some problems with these hubs cracking. (for reference, on 8" wheels, with locktite) The conclusion we came to was that there is quite a large gap between the two pieces right were you bolt them together. The cracks we started to see were stress factures, perpendicular to the screws, near the middle of the piece, and always where the screws are. To me this seems to shy away from any degrading issues with the locktite, and more towards stress, as they were away from the surface the locktite was applied to. (but we did have one failure that I would chalk up to the "locktite theory". So... we put some polycarb. spacers in between the two pieces. They weren't hard to make, just time consuming (we used several thin pieces - not ideal, but the sheet was free...). I think this does two things: 1) helps relief stress by filling in that gap, and 2) prevents someone from over-torquing the screws, and pulling the two halves too close together. For the second reason along I think they were worth the effort.

Just our thoughts
Erik
(disclaimer - I am not, nor do I pretend to be, and ME or materials science person - I'm just some lowly EE college student....)


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