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Unread 25-01-2017, 23:02
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Billfred Billfred is offline
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Re: Polycord and polycord pullies

Quote:
Originally Posted by Maldridge422 View Post
This. I believe we bought 3/16" IIRC, solid core, clear (which was mostly a favor to me because orange has connotations where I'm from.)

We also bought UHMW rods, originally 2" but we found 1.75" was closer to what we needed. One of our mentors has a lathe and has been working on cutting them into 3" pulleys with two grooves apiece. Once bored to the correct round size, I take them to work and broach them for 1/2" hex on the arbor press there. We're then sliding them onto 1/2" churro, as the finished pulleys are a little easier to get on and off compared to regular hex stock; we may switch for the final production robot.

(Full disclosure, I work at AndyMark that sells the 1/2" hex broach.)

(And before anyone goes "but where are the kids in all this?": We put them to work as much as possible, but this is a case where the necessary machines and tools aren't in the same town or even the same county as the school. The kids will be getting very good at polycord welding once the rollers are done!)
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William "Billfred" Leverette - Gamecock/Jessica Boucher victim/Marketing & Sales Specialist at AndyMark

2004-2006: FRC 1293 (D5 Robotics) - Student, Mentor, Coach
2007-2009: FRC 1618 (Capital Robotics) - Mentor, Coach
2009-2013: FRC 2815 (Los Pollos Locos) - Mentor, Coach - Palmetto '09, Peachtree '11, Palmetto '11, Palmetto '12
2010: FRC 1398 (Keenan Robo-Raiders) - Mentor - Palmetto '10
2014-2016: FRC 4901 (Garnet Squadron) - Co-Founder and Head Bot Coach - Orlando '14, SCRIW '16
2017-: FRC 5402 (Iron Kings) - Mentor

94 events (more than will fit in a ChiefDelphi signature), 14 seasons, over 61,000 miles, and still on a mission from Bob.

Rule #1: Do not die. Rule #2: Be respectful. Rule #3: Be safe. Rule #4: Follow the handbook.
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