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#31
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Re: VEXpro Build Blitz 2015
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The same criticism can be applied to AndyMark. The build events have always been commercials to me. But I don't see this as wrong. Businesses are going to be businesses and do things that businesses do. Expecting a business to not be a business is silly. Last edited by Katie_UPS : 18-12-2014 at 15:20. |
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#32
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Re: VEXpro Build Blitz 2015
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And I like it that more new and under-resourced FIRST teams can roll and score! It is as if VexPro were mentoring hundreds of teams (ordinarily left to flail) which is a good thing. The more students that leave smiling, the better! |
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#33
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As a mentor I liked the concept of ri3d but at the same time seems to squash the creative side. I try very hard to get the kids on our team to think outside the box.
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#34
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I should have included that much can be learned from the quick build teams though. The choochoo design has been around for a couple hundred years, but until you see it incorporated in new tech people seem to not notice. All the quick build teams do a great job and I will never take that away from them.
Last year I had to flat out tell a couple mentors that wanted to basically copy one of the bots NO. I mentor for one reason.,. To see the members have that ahh ha moment, when what ever we are working on clicks in their head and they get it, and have learned something new. |
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#35
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Re: VEXpro Build Blitz 2015
Here's the list of resources that we're working on for Build Blitz 2015.
http://www.buildblitz.com/recycle-rush-is-here/ Quote:
https://plus.google.com/events/cn261...kk6q9hs5o00t7s |
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#36
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Re: VEXpro Build Blitz 2015
Here's the Strategic Analysis that I came up with in conjunction with the Build Blitz team.
http://www.buildblitz.com/build-blit...egic-analysis/ Paul Copioli and I will be talking about it in depth tonight at 9:00 PM eastern. We'll also be opening the floor for your questions. Make sure you tune in! https://plus.google.com/events/cn261...kk6q9hs5o00t7s |
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#37
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Re: VEXpro Build Blitz 2015
Karthik and Paul are LIVE for their Strategic Analysis here:
https://www.youtube.com/watch?v=coC1j7T0840 Join the conversation, especially the Q&A at the end! |
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#38
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Re: VEXpro Build Blitz 2015
Thanks for a great session, and for answering so many questions! Tying a rope around the starting recycle bins is truly an outside-the-box thinking idea that I had yet to hear.
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#39
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Re: VEXpro Build Blitz 2015
You're very welcome! Hopefully it spurs more outside the box ideas. There's a lot of unexplored territory with the major changes introduced this season.
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#40
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Thanks to the Build Blitz team! Just watched the Elevator Video/Blog on the Build Blitz Blog page. Can someone tell me how the elevator will hold the totes elevated? ( what will keep the gearbox from back driving) Thanks in Advance
Last edited by Mr. B : 07-01-2015 at 16:45. |
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#41
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Re: VEXpro Build Blitz 2015
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This is how The GreenHorns decided to solve this problem. |
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#42
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Re: VEXpro Build Blitz 2015
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To help prevent this form of "backdriving", there are several ways to accomplish this, including using the built in PID functions in the FRC code library to hold the elevator at it's current position. This, combined with gearing the elevator such that the stall current at the motor is minimal (e.g. won't smoke a motor) and adding constant force springs to help counterbalance the weight, will help make a fast and responsive linear motion system. The current iteration of our elevator prototype is geared to quickly pickup totes (<1 second to bottom stack) with a single BAG Motor and 2-stage VersaPlanetary gearbox, while the motor remains at 25% of stall current with an elevator load (carriage + tote weight) of 60lbs. This is without any constant force springs to help counter-balance the system. For implementing PID controls, I've had good success previously (most recently in 2011 when I was on 228) using Sharp IR distance sensors for elevator height control. For this, it was as simple as mounting the sensor on the robot chassis looking up at the elevator carriage to measure the height of the elevator. |
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#43
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Re: VEXpro Build Blitz 2015
Do you have any data or rules of thumb on how much current the CIM/MiniCIM/BAG motors can take for how long before they smoke?
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#44
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Re: VEXpro Build Blitz 2015
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http://www.buildblitz.com/pinchclaw-...drawing-files/ ![]() ![]() |
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#45
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Re: VEXpro Build Blitz 2015
Some more educational resources have been posted.
A full guide on how to design a claw for Recycle Rush. http://www.buildblitz.com/claw-design-guide/ Quote:
http://www.buildblitz.com/drivetrains-for-recycle-rush/ Quote:
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