Posted by EJ at 1/10/2001 2:28 AM EST
Student on team #254, Cheesy Poofs, from Bellarmine.
I was wondering if anyone had put any thought into designing a mechanism to switch the drill moters from high to low gear? If so u can contact me and we could swap some ideas.
Posted by Ken Leung at 1/10/2001 6:18 AM EST
Student on team #192, Gunn Robotics Team, from Henry M. Gunn Senior High School.
In Reply to: high-low gear switching
Posted by EJ on 1/10/2001 2:28 AM EST:
At the white paper section of this site, there is a Gear Switching and Motor Mount Design from Andrew Baker of Technokats. Take a look at it! That design is reliable and well worth the time to look into it.
Posted by Joe Johnson at 1/10/2001 8:03 AM EST
Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.
In Reply to: White paper section
Posted by Ken Leung on 1/10/2001 6:18 AM EST:
Pay attention to the fact that software make the thing work. If you don’t watch yourself, your gearbox will make that terrifying buzzing sound and you will not shift again!
Joe J.
Posted by Anton Abaya at 1/11/2001 4:41 AM EST
Coach on team #419, Rambots, from UMass Boston / BC High and NASA, Mathsoft, Solidworks.
In Reply to: software makes it go!
Posted by Joe Johnson on 1/10/2001 8:03 AM EST:
we thought we dropped an earing inside the gearbox…
heh
-a
Posted by Patrick Dingle at 03/09/2001 6:58 PM EST
Coach on team #639, Red B^2, from Ithaca High School and Cornell University.
In Reply to: Re: WHAT???..
Posted by Thomas A. Frank on 03/09/2001 4:53 PM EST:
Yes, it is clearly me who you meant to address the message to. Until today, I was unaware that chains and sprockets had been on the additional hardware list… And as i’ve mentioned before, I see no reason why they shouldn’t. All I’m saying, is thank you to Small Parts for the discount they are providing, because it did help out our team.
Patrick
: : All I’m saying… for us, it is a LOT cheaper to purchase sprockets through SPI when they charge ONLY SHIPPING for them then when we purchase them through another catalog such as mcmaster carr.
: Jason;
: Assuming SPI has a size that mets your needs, and assuming it is in stock, you are probably right when looked at in a narrow way, but while I can see what you are saying, I think you might be missing the bigger picture.
: Under last years rules, you could have gone over to your local bicycle shop and asked them to donate 20 feet of chain and some sprockets. I guarantee you would have gotten them (probably used, but who cares?), and they would really have been free (ignoring the thank you letters 34 cents postage).
: I don’t have any problem with SPI doing this, and making money at it. That’s how our economic system is supposed to wrok. But with the freedom to engage in such a business, there exists a responsibility that requires that you be able to provide the goods/services required in a timely and cost effective manner. SPI is not always very good at this. Thus I think that FIRST needs to continue loosening the construction rules to make it easier for teams to utilize whatever they have on hand to build the machine.
: It is hard enough getting volunteers to do this without annoying those who do give of their time with absurd rules that do not accomplish anything positive.
: Everybody has access to a “junk bin” of some sort or other. The standard refrain I heard was “why can’t we just use this (fill in the blank) which is just sitting hear”. 'Cause that’s the rules (grumble, grumble).
: Makes it tough to get people to volunteer for next year…
: Tom Frank
Posted by Ken Leung at 1/13/2001 5:39 AM EST
Student on team #192, Gunn Robotics Team, from Henry M. Gunn Senior High School.
In Reply to: Re: White paper section
Posted by Travis Covington on 1/13/2001 2:35 AM EST:
While we are still in the exploration period where we try out different prototypes, we are certainly considering this gear shifting setup as one of this year’s option. We already have a student build a model of it, and it seems quite promising. The we use HDPE block for the part where the servo actually pushes, and it seems quite smooth. We just need to test it under stress and see if its reaction. The only issue we have to think about is if this device will hold the gear setting during competition… otherwise we are going to use a ring to lock the gear in place, and use some other way of shifting external gears to select between torque or speed, that is if we feels that’s necessary for our robot to do well.
As for the motor mount, the paper of Andy baker didn’t include a way of mounting the motor body, so we probably will use our own again. one thing for sure is that we take the drive train extreemly serious this year, and lots of modification to implement to the whole setup including new way of mounting sprockets as well as Dr. Joe’s output shaft and a more efficient drive train system. Be prepare for a unbreakable drive train from us…
Posted by Andy Baker at 1/13/2001 6:26 AM EST
Engineer on team #45, TechnoKats, from Kokomo High School and Delphi Automotive Systems.
In Reply to: Maybe…
Posted by Ken Leung on 1/13/2001 5:39 AM EST:
: As for the motor mount, the paper of Andy baker didn’t include a way of mounting the motor body…
Umm… yeah it did. This is the first that I’ve heard of something that major being missing. Go check again.
Andy Baker
Posted by Ken Leung at 1/13/2001 2:19 PM EST
Student on team #192, Gunn Robotics Team, from Henry M. Gunn Senior High School.
In Reply to: Huh?
Posted by Andy Baker on 1/13/2001 6:26 AM EST:
You are right, Andy. It just seems like the motor is hanging outside of the whole setup without support at the back… it was late at night and I wasn’t thinking clearly. But one thing worth adding to the back of the motors are stree relieve to the wire tab at the back of the motor. We learn this lesson the hard way at competition. The tab broke off because of some reason, and we had to rush to replace the motors with new one’s, but we forgot to call a time out. That cost us the regional. And this year there aren’t even time out.
But hey! Thanks for sharing this setup with everyone out here. It’s an amazing design! How did you manage to create this out of nowhere?
Posted by Andy Baker at 1/14/2001 8:24 AM EST
Engineer on team #45, TechnoKats, from Kokomo High School and Delphi Automotive Systems.
In Reply to: oops…
Posted by Ken Leung on 1/13/2001 2:19 PM EST:
Ken,
It’s my job. I get to design robots and automated equipment for Delphi’s production lines. They even pay me to do it!
Stop by team 45’s pit for some improvements to this design, strain relief included.
Andy B.