I am wondering if anyone has any information about 233’s telescoping lift, including information about the parts in the gearbox and the claw and how the inner parts of the lift works. From the information I have found on other posts and pictures I have not been able to fully create enough of an understanding of how it operated. Thank you.
Spectrum’s entire folder of “2011 robot pictures” is close ups of 233 (and a single 111 picture).
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Thank You! This helps a lot!
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No problem. The guts of it are essentially a cascade elevator.
The trick to a Pink arm is apparently “a lot of staggeringly beautiful machining.”
On the topic of Spectrum, they also built a Pink arm in 2018 and have CAD online for it.
https://grabcad.com/library/spectrum-3847-infrared-2018-frc-robot-1
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This is Great! The CAD will be really useful for understanding the arm!
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If you’re interested in looking at how some other teams did it, 2168 and 100 both did offseason projects and released the CAD for it.
I recommend looking at both, they’re crazy cool!
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Ok I will check them out!
Well now that I’m digging through the photo…anyone know why they chose to use a double #25 sprocket instead of a single #35 sprocket?
This year we did a Pink arm. I am willing to answer any questions you may have. I also have a full CAD model that I would be willing to share directly with you.
The sheer quantity of design elements aimed at reliability that are built-in to the 2011 PINK arm is absolutely mind-blowing.
I asked them this in DC. Apparently it was for lower backlash.
Would it provide lower backlash if the two sprockets are not slightly offset rotationally? Based on the pictures, it looks like they are not.
Unfortunatly we dont have the 2011 cad or robot anymore. All of our other telescoping bots are still intact tho.
Here’s a long and descriptive old CD thread about it. 233 telescoping arms how do they work?
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Team 27 RUSH had a telescoping arm in 2011 too. I remember that one distinctly. It had a super loud (grinding?) noise when it was articulating.
What was the noise from? That was my first year ever in robotics, and that was one of the things I never understood or could forget
Friction clutch.
From the drill motor?
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It’s using two sloppy methods to over-constrain the DOF. Basically cross your fingers that the tolerances in each stack add up a little differently.
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