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I log on and see that this thread is at the top....cool....some more pics maybe? Some video? No, it's the same old jackass's thread jacking the thread with their crap.....
Would the cush drive help eliminate shearing off every single bolt holding the sprocket to the central drive hub? Im begining to think that the flat head bolts cant take the load. I sheared them all off this past weekend.
That being said, I acknowledge the problem Doug is suffering with. It happened on the first day we took Ray's buggy out. You know what the solution appears to be? Are you sitting down?They are welding the sprocket to the hub.I kid you not.
I think you're going to find that the countersunk area is not very concentric with the threads. If it were me I'd redesign if possible and avoid their use. My first drive used the CS bolts and even though they never loosened it was impossible to torque to proper value. I was using 7/16" torx drive CS flat head cap screws.
OK I just learned somthing. I take back the possibilty of my bolts being loose. It is very possible without even knowing. I still need to tear the cartridge down to inspect it.What I just learned is that metric flat head hardware is 90* and NOT 82*. This can make a huge difference in the way the bolt heads seat in the countersink. I am ordering a 90* countersink 1" diameter today. To go the extra step I am also going to fixture the bolts in the lathe and re establish that the 90* is a perfect machined finish surface.Not knowing the difference in the degrees, I countersunk the sprockets at 82*, I think this will fix it.I also made a few drive hubs withe the orientation offset to get a nut on the backside. Booyah! All in all it took over a year to fail and alot of hard riding.
The re machining of the backside of the heads will make it concentric with the thread. I do agree maybe redesign it, but Im also trying to help others with the info I have and fix it rather simplified for those without resources. Im going to try it for my own education.
OMG, You're just realizing that a metric flathead is 90 degree.I thought every machinist knew this sort of thing.How many have you made at 82?
How many have you made at 82?
Have you ever seen how thick a machinist hand book is. The machinist hand books still do not contain everything either as we just needed to purchase some other info on DIN undercuts for relieving corners on shafts in the paper industry. No one can possibly have an entire machinist hand book memorised.