I like this
Finally, I remind them that geologically speaking, all of this matters very
little - have fun, live in the now and try, try again.
And these are teaching moments for the kids that want to know more. Think
about the mars rover missions. Now that is where precision matters.
All fun.
On Thu, Nov 4, 2010 at 3:56 PM, Jerry Lorengo <[log in to unmask]>wrote:
> On repeatability,accuracy and engineering.
>
> I was trained as an engineer and a pretty intuitive.
>
> Every year, it seems every mission has a degree of repeatability that
> borders on chaos.
>
> My team used to really get frustrated with such randomness of performance
> by the robot.
>
> When it gets bad, I bring things back to earth. I remind them that we are
> here to have fun and learn. Being competitive is nice and winning is better
> but if you get too serious and worry about every little thing that could
> (and will go wrong) then you will spend all of your time juggling the
> what-ifs instead of just trying.
>
> Finally, I remind them that geologically speaking, all of this matters very
> little - have fun, live in the now and try, try again.
>
> Sent from my iPhone
>
> On Nov 4, 2010, at 3:29 PM, Mandy Wilson <[log in to unmask]> wrote:
>
> Turns out that our problem was a faulty motor on the left side which caused
> the merry go round effect when it turned right. My son, who is
> homeschooled, read all of the emails and helpful suggestions that came in
> and ran upstairs to test. Sure enough when the right turn was changed to a
> left, the program worked perfectly. (It didn’t occur to me that was the
> only right turn the team had done in the last few days). When he replaced
> the motor the right turn in that program worked perfectly. Always nice to
> have a motor burn out 2 days before the competition! Now apparently many
> things are just slightly off as this motor is a little different than the
> last and my son is not pleased that he and his friends now have to redo
> almost everything! Maybe this is why people drop out of events? No the
> team is not dropping out, but it will be nice if they can get back to where
> they were. Thanks to everyone who helped. I don’t know what this team
> would have done without all your help as today the merry go round effect was
> occurring 50% of the time. I’m sure the motor would have been completely
> dead in 2 days.
>
>
>
> Mandy
>
>
>
> *From:* First Lego League in Virginia and DC [mailto:
> [log in to unmask]] *On Behalf Of *Eric Palmer
> *Sent:* Thursday, November 04, 2010 1:43 PM
> *To:* <[log in to unmask]>[log in to unmask]
> *Subject:* Re: [VADCFLL-L] NXT merry go round effect
>
>
>
> My team this year had a robot with a particular mission and attachment set
> that had a "veer left bias" They changed the whole robot to our backup and
> it "veered very slightly right" on further inspection the first robot has an
> axle going through a beam that has been damaged so there was more friction
> on the left side.
>
> For the right bias they moved a counter weight to the left and the robot
> goes straight most of the time. But even with that it varies, sometimes
> badly.
>
> We are using disposable batteries this year and they monitor voltage
> closely. The front missions they use fully or nearly fully changed
> batteries and the last mission they use batteries whose top voltage has been
> lowered.
>
> They use a slight moist cloth to wipe the dust off the table before
> practice and we occasionally wipe the dust off the wheels and let the tires
> dry. They store the robot upside down so the wheels don't get flat spots.
>
> The team pays attention to many more factors for repeatability as well.
>
> But that said we still have problems with erratic behavior. Turing for
> example seems to work best (for repeatability) one wheel at a time. That
> slows down the missions but makes the missions more repeatable.
>
> All learning opportunities.
>
> Eric
>
> On Thu, Nov 4, 2010 at 1:24 PM, Nagesh Chintada <<[log in to unmask]>
> [log in to unmask]> wrote:
>
> This is hard to figure out without seeing it, but couple of questions come
> to mind:
> 1. Has your team tried to reduce the power, to say, 50 or below?
> 2. How is the robot balance and center of gravity? For example, does it
> happen if the attachments are removed?
> 3. I noticed that sometimes loose wheels can cause strangest behaviors in
> movement, so not a bad idea to check if the any part of the attachments/
> frame and wheels are not loose.
>
> Just a comment: The great fun of FLL is ruined especially to rookie teams
> because of all the variability in the NXT Robots. These are no doubt complex
> products, and it is not easy to get consistent behavior. It requires some
> experience and lots of practice. This is not my first year, but I am still
> learning.
>
> I wish Lego or FLL would make it easier for all the teams - and improve the
> fun factor - by providing some basic information/ instructions/ best
> practices to reduce variability as part of the NXT kit or FLL kit. Just a
> thought. I'd like to see more teams having more fun than struggle so much.
>
> Nagesh
>
>
>
> On Thu, Nov 4, 2010 at 10:15 AM, Mandy Wilson < <[log in to unmask]>
> [log in to unmask]> wrote:
>
> This turn does not involve sensors. It’s just a plain point turn.
>
>
>
> *From:* First Lego League in Virginia and DC [mailto:<[log in to unmask]>
> [log in to unmask]] *On Behalf Of *Eric Palmer
> *Sent:* Thursday, November 04, 2010 10:09 AM
> *To:* <[log in to unmask]>[log in to unmask]
> *Subject:* Re: [VADCFLL-L] NXT merry go round effect
>
>
>
> I wish I knew what causes this. We see it occasionally. Something lose
> wires. Sometimes changes in battery levels. Do check to make sure that if
> you are using sensors that they are working reliably.
>
> On Thu, Nov 4, 2010 at 10:06 AM, Mandy Wilson < <[log in to unmask]>
> [log in to unmask]> wrote:
>
>
>
>
>
> Our team has a part of its program where the robot is supposed to turn some
> nominal amount (around 30 degrees) and for some reason every 5th run or
> so, it spins about 120 degrees. They have put a reset motor block, a break
> block and even a 1 sec wait block in front of the errant turn in order to
> stop the issue, but nothing they have done works. They’ve even tried
> deleting the block and putting another one in. They thought it was the
> gearing on the wheels coming loose which also causes it to act up, but on
> the 6-9th run it works fine and then at run 10 it does it again. Well not
> quite that predictable, but you get my point. Has anyone else had this
> problem and is there a way to fix it, or should the team just be resigned to
> blow a round at the tournament? Thanks for all the help – this is our first
> year!
>
>
>
> Mandy
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> --
> Nagesh Chintada
> Phone: 703-829-0284
>
>
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