2017-01-18
Clio Batali
Clio Batali8:33 PM

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Clio Batali
Clio Batali8:33 PM

@Clio Batali set the channel purpose: For those who hope to agitate, and discuss the means by which this would be best accomplished

Jack Chapman
Jack Chapman8:41 PM

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Julian Bonifaci
Julian Bonifaci10:45 PM

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Cruz Strom
Cruz Strom10:45 PM

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Parker Hutchinson
Parker Hutchinson10:45 PM

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Lucas Rininger
Lucas Rininger10:45 PM

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Finn Mander
Finn Mander10:45 PM

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brian_bonifaci
brian_bonifaci10:45 PM

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Jacob Barfield
Jacob Barfield10:45 PM

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Adrianna Carter
Adrianna Carter10:45 PM

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Jeremy Lipschutz10:45 PM

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Samantha Rosen
Samantha Rosen10:45 PM

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Brian Hutchison10:45 PM

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Ronan Bennett
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Dana Batali
Dana Batali10:45 PM

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Alex Larson Freeman
Alex Larson Freeman10:45 PM

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Enrique Chee
Enrique Chee10:45 PM

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Will Hobbs
Will Hobbs10:45 PM

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Jon Coonan10:45 PM

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2017-01-19
Dana Batali
Dana Batali9:25 AM

my primary concern with respect to the agitator is that we have not yet prototyped the mechanism by which the agitator feeds the shooter. Seems like this aspect has, so far, fallen between the cracks because we've divided these two subsystems into separate groups.

Clio Batali
Clio Batali10:38 AM

That's a really good point - it looks like this will be a weak point to watch out for. Are there any people (students and mentors) who would be interested in making sure this is addressed throughout design discussion and prototyping? This would require awareness and understanding of both the intake and launcher.

Jack Chapman
Jack Chapman4:54 PM

I will try, I do think that a major concern in this respect is making sure the launcher intake and our output are on the same level

2017-01-20
Chris Mentzer
Chris Mentzer11:25 AM

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Dana Batali
Dana Batali12:16 PM

Dana Batali
Dana Batali12:17 PM

more pix in the launcher thread

Riyadth Al-Kazily
Riyadth Al-Kazily12:48 PM

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Timo Lahtinen
Timo Lahtinen12:57 PM

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Kenneth Wiersema
Kenneth Wiersema3:14 PM

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Lia Johansen
Lia Johansen3:16 PM

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Tom Wiggin
Tom Wiggin4:07 PM

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Jack Stratton
Jack Stratton4:14 PM

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Tom Wiggin4:15 PM

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2017-01-22
Binnur Alkazily
Binnur Alkazily1:32 PM

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Jack Chapman
Jack Chapman7:02 PM

@Cruz Strom, @brian_bonifaci, @Julian Bonifaci, just to make sure, we decided to go with a 4 bladed design without the cover plate, and have the top half of the carosel be made of polycarb with a very solid ejector rod, right?

Jack Chapman
Jack Chapman7:10 PM

I'll try to get my drawn design into the channel

Jack Chapman
Jack Chapman7:14 PM

Here is a link (hopefully) to my design

Jack Chapman
Jack Chapman7:15 PM

@Parker Hutchinson, do you want to make sure that this is what we have in cad?

Jack Chapman
Jack Chapman7:15 PM

also do you want to meet sometime so that I can fill you in on what we are doing?

John Sachs
John Sachs8:16 PM

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brian_bonifaci
brian_bonifaci9:19 PM

Yes, I think that's right.

Jack Chapman
Jack Chapman9:50 PM

OK, were going with this s

Enrique Chee
Enrique Chee9:53 PM

Part orders ? Materials ? otherwise nothing for Friday.

Enrique Chee
Enrique Chee9:59 PM

Jack, Can you send me ASAP, like in the next 10 min.

Enrique Chee
Enrique Chee10:00 PM

I want to be done with all orders tonight for Friday's session.

Binnur Alkazily
Binnur Alkazily10:02 PM

that was a cool video!!! Woot! :slightlysmilingface:

Enrique Chee
Enrique Chee10:08 PM

Jack, Did you look at all the polycarbs we have ? various thickness and perforated vs solid ?

Jack Chapman
Jack Chapman10:09 PM

no, i did not

Enrique Chee
Enrique Chee10:24 PM

Do you know what you thickness you need in terms of polycarb ?

Will Hobbs
Will Hobbs10:43 PM

1/4 in I believe is what they designed around

Enrique Chee
Enrique Chee10:48 PM

For the hooper ?

Enrique Chee
Enrique Chee10:48 PM

hopper

Jack Chapman
Jack Chapman10:53 PM

I think that .25" thick would probably work, I haven't really taken a good long look at the polycarb that we have so as of right now so I can't make a solid decision yet.

Will Hobbs
Will Hobbs10:54 PM

1/4in for blades

Will Hobbs
Will Hobbs10:55 PM

There are a few sheets of thin polycarbonate you could use for the hopper

Enrique Chee
Enrique Chee11:00 PM

ok, Thanks

Enrique Chee
Enrique Chee11:01 PM

this is waht was order last week: 0.118" Clear Polycarbonate Sheet - 24" x 24" $12.46 1 $12.46
0.06" Clear Polycarbonate Sheet - 24" x 24" $7.14 1 $7.14
0.03" Clear Polycarbonate Sheet - 24" x 48" $9.94 1 $9.94

Enrique Chee
Enrique Chee11:01 PM

no 1/4 inch

Will Hobbs
Will Hobbs11:04 PM

We have those yellow side panels from gaea that I believe are 1/4 in and I think there are also some other 1/4 in pieces

Enrique Chee
Enrique Chee11:06 PM

correct. So wait till Friday for polycarb and al order for agitator from online metal ? Will this agitate the subteam ?

Will Hobbs
Will Hobbs11:08 PM

I think that should be fine

Will Hobbs
Will Hobbs11:08 PM

I also think we may have some other pieces of aluminum that could work

Enrique Chee
Enrique Chee11:09 PM

ok, good night. Great job team on slack !!! Good luck with finals all.

2017-01-23
Lucas Rininger
Lucas Rininger5:00 PM

What is the max height of the storage walls relative to the top of the frame?

Jack Chapman
Jack Chapman5:20 PM

I believe that we were going for having the walls be as tall as is legal, but a section would be lowered for the intake

Lucas Rininger
Lucas Rininger5:30 PM

So ~22 in from the ground?

Jack Chapman
Jack Chapman5:31 PM

yeah

2017-01-24
Riyadth Al-Kazily
Riyadth Al-Kazily9:38 AM

Will the agitator/carousel have the ability to reliably push out a single ball into the shooter? That is, will we have a feedback sensor that the programmers can use to implement a "single shot" mode? It would probably be a very useful thing for aiming (under driver control), so that we can shoot out a single ball at a time while the robot is positioned, and then go full speed.

Riyadth Al-Kazily
Riyadth Al-Kazily9:39 AM

I'm thinking something like a limit switch pushed by a cam on the carousel each time a ball is released (so the motor can be stopped). Better yet, and optical sensor that is pointed at some reflective tape on the carousel.

Riyadth Al-Kazily
Riyadth Al-Kazily9:40 AM

If we don't do this, then we may lose a lot of balls during the aiming process.

Jack Chapman
Jack Chapman3:13 PM

We will have a encoder on our motor shaft, and a half rotation will release a ball, however if you want a limit switch to count the balls, I'm sure that it could be implemented.

Riyadth Al-Kazily
Riyadth Al-Kazily4:09 PM

The trouble with just an encoder is that we don't know where in the cycle of releasing a ball we are. Encoders are relative, and so we would need some other sensor to let us calibrate the "home" position. Once we know that, we can just use the encoder going forward, but each time the robot is powered on we would need to reset the carousel to the home position first.

Riyadth Al-Kazily
Riyadth Al-Kazily4:10 PM

And remember, it's not that I want a limit switch, but I'm suggesting that you (the team) probably want a limit switch (or something similar). Preferably not a limit switch that could break (which is why I suggested an optical sensor.

Jim Carr
Jim Carr4:59 PM

@Jim Carr has joined the channel

2017-01-26
Lucas Rininger
Lucas Rininger6:43 PM

Current intake design. Does this work for you guys?

Jack Chapman
Jack Chapman9:20 PM

it should

Lucas Rininger
Lucas Rininger9:35 PM

What do you think about lowering the height of the "blender" portion of the design? I ask that because you basically lose all the storage space that is below the top of the cylinder, and I'm not sure there is a reason for needing it to be 7 inches tall.

Jack Chapman
Jack Chapman9:38 PM

If you mean the carousel, I have it in my notebook as 5 inches tall, which is the smallest we think it can be

Finn Mander
Finn Mander9:39 PM

Are we still going to have a cone of some sort on top of the central mounting point for the fins in the carousel to push the balls to the side?

Jack Chapman
Jack Chapman9:40 PM

No

2017-01-27
Dana Batali
Dana Batali9:06 AM

i'm concerned that the exit point would cause us to lose important volume in the bin... The idea is that the ball can legally transit outside the robot envelope, so I'd guess that the height of the slot could be max-height - .5 * ball diameter... This might also suggest that the siide panels continue to the top of the mechanism.

Jack Chapman
Jack Chapman9:39 AM

Is this for the carousel/agitator or the intake?

Enrique Chee
Enrique Chee9:51 AM

When balls are store at the top of our hopper , are we going to exceed 24 inches in height ? What is the rule with game elements exceeding the required volume ?

Dana Batali
Dana Batali10:01 AM

@Jack Chapman : oops - as you say, I was referring to the intake, not the agitator, sorry.
@Enrique Chee : my reading is that the game elements aren't part of the robot-envelop rule. This, of course, should be double-checked by our rule masters.

Kenneth Wiersema
Kenneth Wiersema11:11 AM

That was my thought, but it was a question I was think about for the Q/A system

2017-01-30
Clio Batali
Clio Batali5:32 PM

Encoder update: looks like we’ll be integrating the srx magnetic encoder instead of the AMT103 shaft encoder. Paul, Peter, and Samantha have been working on how this will work for the launcher, so you may want to talk to them about similar strategies for the agitator. The method you go with entirely depends on how/where you mount the motor, but it’s worth thinking about before our next meeting.

Clio Batali
Clio Batali5:33 PM

If you’re interested: http://www.ctr-electronics.com/downloads/pdf/Magnetic%20Encoder%20User's%20Guide.pdf (page 8 if you’re confused about mounting)

Chris Rininger
Chris Rininger6:50 PM

@Chris Rininger has joined the channel

Chris Rininger
Chris Rininger6:53 PM

I told someone I would ask my mom about stretchy fabric recommendations for ball storage, and she got back to me that something like this should work well: https://www.amazon.com/gp/aw/d/B0189YP7LU/ref=mpsa11?ie=UTF8&qid=1485796195&sr=8-1&pi=ACSX236SY340QL65&keywords=mesh+stretch+fabric&dpPl=1&dpID=619cstghoIL&ref=plSrch. I think it's like the fabric used on the office chairs with stretchy fabric backs

Jack Chapman
Jack Chapman9:49 PM

Thanks Chris, based on the reviews it looks stretchy enough. Does anyone else have thoughts?

Chris Rininger
Chris Rininger9:50 PM

you can also see through it a bit - a plus for the application

Jack Chapman
Jack Chapman9:51 PM

That should make it easier for the driving team

Chris Rininger
Chris Rininger10:07 PM

I know the idea of the stretchy fabric is to allow ball storage volume to expand outside the chassis volume into the bumper volume. Could you also have the floor be slack mesh and allow ball storage below the top of the agitator... and then once the volume is full somehow take up the slack so the balls raise up higher and pour into the top of the agitator? If workable could increase storage capacity.

Lucas Rininger
Lucas Rininger10:15 PM

What if the walls of the storage opened outward after the match started?

2017-01-31
Dana Batali
Dana Batali9:03 AM

i believe the rule is: no part of the robot can extend beyond the established envelope. Even it's a flexible bag, i reckon that that would be against the rules... Still, I defer to the rulemasters.

2017-02-09
Paul Vibrans
Paul Vibrans11:21 AM

@Paul Vibrans has joined the channel

Paul Vibrans
Paul Vibrans11:24 AM

If a referee sees the fabric extend beyond the bumpers and believes the bumpers are at the maximum for robot size, then a penalty will be called. We will have a

Paul Vibrans
Paul Vibrans11:28 AM

difficult time disputing this unless we can show our bumpers are substantially smaller than the maximum, which they are not. Arguing with judges is not considered gracious professionalism.

Jack Chapman
Jack Chapman9:07 PM

That is a good point Paul.

Jack Chapman
Jack Chapman9:43 PM

We should come up with ideas for tomorrow's meeting to prevent the fabric from going outside the bumper zone

Enrique Chee
Enrique Chee9:48 PM

Nothing can extend outside the frame perimeter ( Not bumper perimeter ).

Jack Chapman
Jack Chapman9:49 PM

true

John Sachs
John Sachs9:58 PM

Just to clarify, i believe it's only at the start of the match that everything has to be inside the frame perimeter. Once the match starts, you can extend outside the frame but you can't exceed the max volume, which in our case is pretty much defined by our bumper dimensions.

2017-02-10
Enrique Chee
Enrique Chee7:40 AM

Correct . Thanks for clarifying.

Alex Larson Freeman
Alex Larson Freeman8:00 PM

2017-02-11
Chris Rininger
Chris Rininger10:22 AM

A while back Riyadth shared a link to photos taken by FRC 2877 (Ligerbots) at the Steamworks announce, and one of them was of the turntable inside the boiler. It seems like they have a number of things they're doing to prevent jams - thought it might be useful to dig that up and share. Here's a link to the full set of pictures again in case anyone's interested: https://www.flickr.com/photos/ligerbots/sets/72157678872068725

Kaedric Holt
Kaedric Holt3:00 PM

@Kaedric Holt has joined the channel

Jack Chapman
Jack Chapman10:32 PM

Two quick questions, firstly, who is actually coming at 11 am tomorrow, and secondly, what do we think of making a second agitator instead of spare parts for the first?

brian_bonifaci
brian_bonifaci11:06 PM

I'll be there.

2017-02-12
Chris Rininger
Chris Rininger2:10 AM

Saw this on CD this evening - similar design... https://www.chiefdelphi.com/media/photos/44246

Cruz Strom
Cruz Strom7:49 AM

I will be there

Paul Vibrans
Paul Vibrans9:44 AM

A second agitator is more important in my opinion than spare parts for the first. If needed, parts from the second agitator can be used as spares for the first.

Enrique Chee
Enrique Chee9:53 AM

When we say second agitator , do we mean a different design ? If not , let's focus on finishing the 1st one and mounting it on the robot . Once this is tested and works , then we make spare parts for the agitator which might be a complete identical 2nd one. Am I missing something?

Dana Batali
Dana Batali11:06 AM

I agree we need a combined agitator shooter asap to program... There's so many unknowns at the moment in terms of software control and tuning

Paul Vibrans
Paul Vibrans11:32 AM

With what we know now the second agitator should be the same as the first.

2017-02-15
Alex Larson Freeman
Alex Larson Freeman8:39 PM

We found the shaft!

2017-02-20
Enrique Chee
Enrique Chee7:53 AM

Whose researching ? Can't just rely on programming.

2017-02-21
Will Hobbs
Will Hobbs12:50 AM

The rope on he hopper fabric was beginning to come out at the end of the meeting tonight. Please fix this permanently tommorow

2017-10-25
John Sachs
John Sachs5:39 PM

@John Sachs has left the channel

Jon Coonan
Jon Coonan5:54 PM

@Jon Coonan archived the channel