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Unread 28-04-2015, 15:01
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Michael Hill Michael Hill is offline
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FRC #3138 (Innovators Robotics)
Team Role: Mentor
 
Join Date: Jul 2004
Rookie Year: 2003
Location: Dayton, OH
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Re: VEX Pro Parts Feedback, 2015

I don't think we could be much happier with their performance. I don't believe we had to change any of our 4" omni wheels at all (no defense does help the situation). We ran belt for the first time this year, and used the HTD from Vex. Those worked out great. We used the calculator on West Coast Products' website (with the added [I think 0.003"] between the centers). Didn't have any ratcheting issues. We drove the versaplanetary with a BAG pretty hard. We had a lead screw mechanism. We fortunately didn't have any issues with the snap ring in the gearbox from placing axial force on it like other teams. We had to change gear ratios several times, so I got pretty good at disassembling and reassembling them. The only issue I seem to remember was having not enough material in the mounting bolt holes. There are only a few thousands of aluminum with threads (Either 8-32 or 10-32, I can't recall). We started seeing wear on the threads and eventually stripped them out and had to get a new mounting block. I was initially critical about including so many extra pieces with the versaplanetary wishing you could configure what you wanted online to save a couple bucks, but we eventually used some of what we initially considered extra parts, so I'm glad for that.

We did burn out one BAG motor, but we were admittedly pushing it way harder than we should have. MiniCIMs were great. We used them for our strafing and they worked out great. We used a couple of gears that worked out fine. Actually, one of the most useful VEX products we used this year were the Delrin hex spacers. We found ourselves using them in situations where we weren't expecting. Having pre-made consistently sized spacers were pretty handy keeping on hand, and I'll recommend we buy more next year. We did use the nylon versahubs for our drive and they worked out fine, but when we used them on our arm, they didn't work out so hot. There was a little too much play that they allowed so we had to take them off. Lesson learned.