Quote:
Originally Posted by terryp
A bit of an exaggeration, but at least $100 for the pair.
I'll eventually take the old gearbox to a shop to see if there's anything they can do without having to open it. I'll also watch for a used machine with other problems for the right price. But for now, I've ordered a new gearbox.
As for Carl's suggestion that something else might have been damaged, I think that's very unlikely, considering how much torque gets delivered to the wheels.
I'll also pick up a smaller torque wrench. Mine goes up to 150 ft-lbs, so probably isn't very accurate around the 25 mark. It was the only choice at the local auto parts store.
Finally, since the other bolts have survived 50 ft-lbs for years, I'm not too worried that one's going to snap while riding now that I've reduced the torque to half that. <Knocking on wood>
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I don't mean to be difficult, but I cannot understand how you snapped it with only 50 pounds of force. That bolt, if not damaged, should easily withstand that pressure.
Many times, a nut may be stripped, or cross threaded, and then the effort to get it tight is not a function of torque at the tightened point, but trying too hard to get the nut to clamp down on the wheel surface.
In other words, you should be able to make the nuts snug to the wheel with your fingers, and then tighten them down with a wrench (to 25 or whatever poundage torque you want).
If you cannot tighten them down with your fingers, but must use a wrench to just get the nut in contact with the wheel, then there is some other impediment to the threads working as they should. That bind can cause a bolt to break.
In this case, I see from some on line segway manuals that the wheel bolts on an i2 should be at 30 N-m, which is 30 newtons at a meter. That converts to about 22 foot pounds of torque, and even the Gen 1 that were at (I think 50 N-m were only at 36 foot pounds.
I found no reference from segway to either 50 pounds of force, or 25 foot pounds of torque for any wheel bolts.
I work with similar hardware all the time. 25 inch pounds is not much at all, and 50 is not either. Even 50 foot pounds is not too much for this bolt, I believe, but I am not here to debate the factory specs, but to say that there may be some other factor involved in the breaking of this bolt.