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Unread 18-12-2012, 12:53
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Re: A Simple Elevator

Patrick.

The 80/20 and similar extrusions are a solid low resource way to make an elevator, but it is a great weight hit.

I'm not saying don't do 80/20, but just hoping people explore the "254 style" of custom aluminum w/ bearings and realize that it doesn't have to be an insane amount of work. It easily can be a day of manually milling (as ours was about a half day of manually milling for a single robot) by someone who knows their way decently on a mill.

In the end, whatever gets the most robot done in the time it needs to get done is the better option, but I hope people don't assume that because "254 did it..." or did something similar, that it is impractical for another team to do it.


Quote:
Originally Posted by JamesCH95 View Post
There are many fastener locking solutions out there, but steer clear of split lock washers. I prefer nylock nuts and Nord lockwashers, personally. There is always safety wire and castle nuts for the supremely cautious.

You can always brute-force it and re-tighten critical fasteners after every match.
Why steer clear?

Often times on our robots, due to our standardization on #10-32s and our love of lightweight manufacture, we can never even get close to proper preload on a bolt before we destroy the parts clamped. In these situations the spring force of a spring lock washer is helpful.

I agree for properly preloaded joints they aren't the solution, but it's surprisingly rare that we can properly preload on our robots without going to impractically small fasteners.
 


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