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Unread 22-10-2001, 17:46
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kmcclary kmcclary is offline
Founder 830/1015;Mentor 66/470/1502
FRC #0470 (Alpha Omega Robotics)
Team Role: Engineer
 
Join Date: Aug 2001
Rookie Year: 1994
Location: Ann Arbor, MI
Posts: 491
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Thanks, Jason & Mike!

I went to the McMaster site, and saw their breakers. Pretty nice! See:
http://www.mcmaster.com/catalog/107/html/0864.html

Jason: Which one of theirs did you get? Can you reinsert pins with it, or is it "one way"? Based on your experience, if we decide to buy a breaker from McMaster, which one would you recommend?

I think I have a lead on some chain, but I'm still looking locally for a breaker.

Now I found a BICYCLE chain breaker tool for $5 and tried it. It looks like a cheap C-clamp, and the metal wasn't very hard. I had to tweak the form with a Dremel for the size difference (#35 is a touch shorter center-to-center per link). Unfortunately the "hardened" push pin was TOO soft. It just bent over when I tried to use it for the first time. (Hmmm... I guess that's what I get for a $5 "commercial grade import"... ;-)

For now, I MAY be able to get away with just using a Dremel tool. I found I can grind off a pair of pins on an outer link and pop the link end cap off. It ruins that one link, but luckily we DO have a few master links to work with in the kit. I'd PREFER having a breaker that can open and close links without wrecking them, but if I find a bit more chain I think we can live with this method if absolutely necessary.

Now that we know what one LOOKS like, if we had more time we probably *could* make a breaker in the school's machine shop. (Maybe later we'll have the shop teacher give it to a student as a suggested "project"... ;-)

If anyone else has a better/cheaper breaker source (or simple breaking method that won't damage links) to recommend, please post it here.

Thanks!
- Keith McClary, Huron High Team 830
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Keith McClary - Organizer/Mentor/Sponsor - Ann Arbor MI area FIRST teams
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