OCCRA
Go to Post I think applying Gracious Professionalism to strictly legal game play trivializes what is a much more important and fundamental FIRST concept. - jimfortytwo [more]
Home
Go Back   Chief Delphi > FIRST > Robot Showcase
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Reply
Thread Tools Rate Thread Display Modes
  #121   Spotlight this post!  
Unread 02-05-2018, 03:13 PM
Thayer McCollum's Avatar
Thayer McCollum Thayer McCollum is offline
Solidly Mediocre Individual
FRC #0159 (Alpine Robotics)
Team Role: Leadership
 
Join Date: Apr 2016
Rookie Year: 2015
Location: Fort Collins
Posts: 518
Thayer McCollum has a reputation beyond reputeThayer McCollum has a reputation beyond reputeThayer McCollum has a reputation beyond reputeThayer McCollum has a reputation beyond reputeThayer McCollum has a reputation beyond reputeThayer McCollum has a reputation beyond reputeThayer McCollum has a reputation beyond reputeThayer McCollum has a reputation beyond reputeThayer McCollum has a reputation beyond reputeThayer McCollum has a reputation beyond reputeThayer McCollum has a reputation beyond repute
Re: FRC 95 2018 Build Thread

Quote:
Originally Posted by JamesCH95 View Post
Thanks!

A few things drove us that way:

-If the ramps are aimed at your superstructure (i.e. side-on) guess what an overly enthusiastic robot is going to crash into? We didn't want to roll those dice!
-Drivers approaching side-on have to deal with the scale's plates
-Drivers approaching side-on have to rely heavily on depth perception to align onto the ramp
-Drivers approaching end-on (i.e. our design) have a good visual indication of how they are aligned without depth perception
-End-on folding geometry lets us make the ramp target as wide as we have height, which is to say much wider than side-on ramps (for the same number of DoFs)
-End-on folding geometry lets us unfold everything with low-force gas springs and gravity more easily than other folding concepts we looked at
We ditched ramps at the end of week 2 because we couldn't come up with a workable, simple, solution. But our mental concept was pretty similar to this. Another reason we favored front on ramps over off the side ones, with side ramps one of your partners has to go through the opposing null territory.
Reply With Quote
  #122   Spotlight this post!  
Unread 02-05-2018, 04:04 PM
D_Price's Avatar
D_Price D_Price is offline
Engineer/Mentor
AKA: Derek
FRC #1708 (Amp'd Robotics (formally Natural Selection))
Team Role: Mentor
 
Join Date: Jan 2007
Rookie Year: 2004
Location: McKeesport, Pa
Posts: 678
D_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant future
Re: FRC 95 2018 Build Thread

How are you holding/folding your ramps up and the legs for the platforms?
__________________
Team member 2004-2008
Team mentor 2008-20XX
http://www.team1708.com/
"Education is a powerful tool. Always use it to better someone else's life"
Reply With Quote
  #123   Spotlight this post!  
Unread 02-05-2018, 04:11 PM
JamesCH95's Avatar
JamesCH95 JamesCH95 is offline
Hardcore Dork
AKA: JCH
FRC #0095 (The Grasshoppers)
Team Role: Engineer
 
Join Date: Dec 2004
Rookie Year: 2001
Location: Enfield, NH
Posts: 2,588
JamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond repute
Re: FRC 95 2018 Build Thread

Quote:
Originally Posted by Thayer McCollum View Post
We ditched ramps at the end of week 2 because we couldn't come up with a workable, simple, solution. But our mental concept was pretty similar to this. Another reason we favored front on ramps over off the side ones, with side ramps one of your partners has to go through the opposing null territory.
Yes. Making at least one side very much defensible.

Quote:
Originally Posted by D_Price View Post
How are you holding/folding your ramps up and the legs for the platforms?
We're planning on deploying with gravity and air springs, with a release mechanism that has been conceptualized but not modeled yet.
__________________
Theory is a nice place, I'd like to go there one day, I hear everything works there.

Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
Reply With Quote
  #124   Spotlight this post!  
Unread 02-05-2018, 07:52 PM
Connor McBride's Avatar
Connor McBride Connor McBride is offline
I live my life 2:30 at a time!
FRC #0166 (Chop Shop)
Team Role: Mentor
 
Join Date: Apr 2015
Rookie Year: 2013
Location: Merrimack, NH
Posts: 152
Connor McBride has a reputation beyond reputeConnor McBride has a reputation beyond reputeConnor McBride has a reputation beyond reputeConnor McBride has a reputation beyond reputeConnor McBride has a reputation beyond reputeConnor McBride has a reputation beyond reputeConnor McBride has a reputation beyond reputeConnor McBride has a reputation beyond reputeConnor McBride has a reputation beyond reputeConnor McBride has a reputation beyond reputeConnor McBride has a reputation beyond repute
Re: FRC 95 2018 Build Thread

How are you deploying the ramps? Also they're 10 pounds each???
__________________
TWITCH - C_MCBRIDE166
FRC 166 2013-2016 (student) 2016-present (mentor/ drive coach)
NHTI VEX U 2016-2017 (treasurer)




Youtube Channel Team Page Facebook Page
Reply With Quote
  #125   Spotlight this post!  
Unread 02-05-2018, 08:09 PM
JamesCH95's Avatar
JamesCH95 JamesCH95 is offline
Hardcore Dork
AKA: JCH
FRC #0095 (The Grasshoppers)
Team Role: Engineer
 
Join Date: Dec 2004
Rookie Year: 2001
Location: Enfield, NH
Posts: 2,588
JamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond repute
Re: FRC 95 2018 Build Thread

Quote:
Originally Posted by Connor McBride View Post
How are you deploying the ramps? Also they're 10 pounds each???
Deployment is not modeled yet, sadly.

We spent tonight making the first iteration of sheet metal ramps. The aluminum substrate weighed ~4lbs. We managed to break them at a suspected weak point, so we're reworking the design to be stronger. We're likely looking at just about 6lbs per ramp for the aluminum structure, 3lbs of 1/16th polycarbonate, then a pound or two for gas springs and hinges. Plus fasteners...

...maybe 10-14 lbs per ramp assembly.
__________________
Theory is a nice place, I'd like to go there one day, I hear everything works there.

Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
Reply With Quote
  #126   Spotlight this post!  
Unread 02-06-2018, 09:38 AM
JamesCH95's Avatar
JamesCH95 JamesCH95 is offline
Hardcore Dork
AKA: JCH
FRC #0095 (The Grasshoppers)
Team Role: Engineer
 
Join Date: Dec 2004
Rookie Year: 2001
Location: Enfield, NH
Posts: 2,588
JamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond repute
Re: FRC 95 2018 Build Thread

I've been a bit light on pictures recently. Here are a few from the last couple weeks.

Start of assembly on the competition robot right after paint.



More competition robot assembly.



Competition robot electronics layout started.



Practice robot was making some weird noises... apparently we had some issues when assembling our ball shifters!



Our first-ever dedicated practice space has been great. A real game-changer for us in terms of getting more practice time in.

__________________
Theory is a nice place, I'd like to go there one day, I hear everything works there.

Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
Reply With Quote
  #127   Spotlight this post!  
Unread 02-07-2018, 12:43 AM
RaKiRosh_3328 RaKiRosh_3328 is offline
Registered User
FRC #3328
 
Join Date: Mar 2016
Location: North Hollywood
Posts: 7
RaKiRosh_3328 is an unknown quantity at this point
Re: Ramps!

Why did you guys decide to have such short ramps and not deploy onto the carpet?
Reply With Quote
  #128   Spotlight this post!  
Unread 02-07-2018, 06:31 AM
JamesCH95's Avatar
JamesCH95 JamesCH95 is offline
Hardcore Dork
AKA: JCH
FRC #0095 (The Grasshoppers)
Team Role: Engineer
 
Join Date: Dec 2004
Rookie Year: 2001
Location: Enfield, NH
Posts: 2,588
JamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond repute
Re: Ramps!

Quote:
Originally Posted by RaKiRosh_3328 View Post
Why did you guys decide to have such short ramps and not deploy onto the carpet?
Good question. Ramps have to extend an impractical amount onto the carpet in order to reach an acceptable approach angle.

This is nominally our geometry with a 21 approach angle, just enough for the AM14U.



Here is a significantly longer ramp with a 24 approach angle, too much for the AM14U.



The shorter ramp met all of our design criteria and was lighter and simpler to make, so we picked it.
__________________
Theory is a nice place, I'd like to go there one day, I hear everything works there.

Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
Reply With Quote
  #129   Spotlight this post!  
Unread 02-07-2018, 02:18 PM
JamesCH95's Avatar
JamesCH95 JamesCH95 is offline
Hardcore Dork
AKA: JCH
FRC #0095 (The Grasshoppers)
Team Role: Engineer
 
Join Date: Dec 2004
Rookie Year: 2001
Location: Enfield, NH
Posts: 2,588
JamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond repute
Re: FRC 95 2018 Build Thread

Quote:
Originally Posted by D_Price View Post
How are you holding/folding your ramps up and the legs for the platforms?
Quote:
Originally Posted by Connor McBride View Post
How are you deploying the ramps? Also they're 10 pounds each???
Ramps are winding up being ~13lbs each with the reinforcements that we think we need. That includes PC decks, two gas springs, 6 hinges, and an estimate on fasteners. Right now we're 90lbs without ramps, so we should be a few pounds under weight. We're also going to explore thinner deck materials because that's a significant part of the weight.

The release mechanism looks like this:



I modeled one state as transparent and one as opaque. We spend most of the match in the 'opaque' state, keeping everything bundled up. When we deploy we latch back to the 'transparent' state which releases the incline and kick stand. We give those a second to deploy with their gas springs, then latch back to the 'opaque' state, allowing the ramp to fall down into place.

This collapsed and deployed ramps shown together.

__________________
Theory is a nice place, I'd like to go there one day, I hear everything works there.

Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
Reply With Quote
  #130   Spotlight this post!  
Unread 02-09-2018, 07:24 AM
JamesCH95's Avatar
JamesCH95 JamesCH95 is offline
Hardcore Dork
AKA: JCH
FRC #0095 (The Grasshoppers)
Team Role: Engineer
 
Join Date: Dec 2004
Rookie Year: 2001
Location: Enfield, NH
Posts: 2,588
JamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond repute
Week 5: Teething Pains

After the burst of productivity in Weeks 3 and 4 we're starting to break things and find many of the weak points in our machine.

The wrist actuators aren't quite strong enough to lift the collector as we would have liked because the collector wound up a little heavier than we originally planned on. We're up-sizing our wrist air cylinders this weekend after attempts to spring-balance it proved unsatisfactory.

Our rail guides took quite a beating in last night's practice driving and will need to be upgraded (someone asked about their strength a few pages back... well...) They performed great during 95% of driving, but one or two hits into a stationary object and:



Wire management on an elevator that moves as fast as ours has also been a challenge. We've made big strides in controlling everything to a satisfactory level, but it's just not quite there yet.

The programmers have squared away set points and closed-loop position control on the elevator though, which is awesome. Next up is closed-loop drive control and auto move development.
__________________
Theory is a nice place, I'd like to go there one day, I hear everything works there.

Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
Reply With Quote
  #131   Spotlight this post!  
Unread 02-09-2018, 08:42 AM
D_Price's Avatar
D_Price D_Price is offline
Engineer/Mentor
AKA: Derek
FRC #1708 (Amp'd Robotics (formally Natural Selection))
Team Role: Mentor
 
Join Date: Jan 2007
Rookie Year: 2004
Location: McKeesport, Pa
Posts: 678
D_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant future
Re: FRC 95 2018 Build Thread

Quote:
Originally Posted by JamesCH95 View Post

I modeled one state as transparent and one as opaque. We spend most of the match in the 'opaque' state, keeping everything bundled up. When we deploy we latch back to the 'transparent' state which releases the incline and kick stand. We give those a second to deploy with their gas springs, then latch back to the 'opaque' state, allowing the ramp to fall down into place.
Actually we are doing something simliar with the ramps being folded up during the whole match until the last 30> seconds. We are dropping the ramp/platform via gravity (not too worried about the drop on the platform damaging the system after extensive testing.) We attached a rotating actuator https://www.mcmaster.com/#=1bhu84k to the rear structural frame of our elevator with an s-hook attached to it. The s-hook is connected to the top frame at the bottom of the ramp with cable. As the platform is dropped pancake pneumatics attached to platform frame push out 4 legs to support up to 200 lbs.
__________________
Team member 2004-2008
Team mentor 2008-20XX
http://www.team1708.com/
"Education is a powerful tool. Always use it to better someone else's life"
Reply With Quote
  #132   Spotlight this post!  
Unread 02-09-2018, 10:08 AM
JamesCH95's Avatar
JamesCH95 JamesCH95 is offline
Hardcore Dork
AKA: JCH
FRC #0095 (The Grasshoppers)
Team Role: Engineer
 
Join Date: Dec 2004
Rookie Year: 2001
Location: Enfield, NH
Posts: 2,588
JamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond repute
Re: FRC 95 2018 Build Thread

Our logo got squared away. Here it is at a decent 10x size increase.




Quote:
Originally Posted by D_Price View Post
Actually we are doing something simliar with the ramps being folded up during the whole match until the last 30> seconds. We are dropping the ramp/platform via gravity (not too worried about the drop on the platform damaging the system after extensive testing.) We attached a rotating actuator https://www.mcmaster.com/#=1bhu84k to the rear structural frame of our elevator with an s-hook attached to it. The s-hook is connected to the top frame at the bottom of the ramp with cable. As the platform is dropped pancake pneumatics attached to platform frame push out 4 legs to support up to 200 lbs.
Link seems broken...

Sounds like a reasonable plan though!
__________________
Theory is a nice place, I'd like to go there one day, I hear everything works there.

Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
Reply With Quote
  #133   Spotlight this post!  
Unread 02-09-2018, 12:18 PM
D_Price's Avatar
D_Price D_Price is offline
Engineer/Mentor
AKA: Derek
FRC #1708 (Amp'd Robotics (formally Natural Selection))
Team Role: Mentor
 
Join Date: Jan 2007
Rookie Year: 2004
Location: McKeesport, Pa
Posts: 678
D_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant futureD_Price has a brilliant future
Re: FRC 95 2018 Build Thread

Ok it seems to redirect you back to the main site.

High-Torque Rotary Air Actuators
__________________
Team member 2004-2008
Team mentor 2008-20XX
http://www.team1708.com/
"Education is a powerful tool. Always use it to better someone else's life"

Last edited by D_Price : 02-09-2018 at 12:21 PM. Reason: Redirection
Reply With Quote
  #134   Spotlight this post!  
Unread 02-09-2018, 09:59 PM
s_forbes's Avatar
s_forbes s_forbes is offline
plz give me red dots
FRC #0842 (Falcon Robotics)
Team Role: Engineer
 
Join Date: Jan 2006
Rookie Year: 2006
Location: Phoenix, AZ
Posts: 1,437
s_forbes has a reputation beyond reputes_forbes has a reputation beyond reputes_forbes has a reputation beyond reputes_forbes has a reputation beyond reputes_forbes has a reputation beyond reputes_forbes has a reputation beyond reputes_forbes has a reputation beyond reputes_forbes has a reputation beyond reputes_forbes has a reputation beyond reputes_forbes has a reputation beyond reputes_forbes has a reputation beyond repute
Re: Week 5: Teething Pains

Quote:
Originally Posted by JamesCH95 View Post
Our rail guides took quite a beating in last night's practice driving and will need to be upgraded (someone asked about their strength a few pages back... well...) They performed great during 95% of driving, but one or two hits into a stationary object and:
Interesting failure mode, I'm curious to see what you guys do to fix it.

This is an elevator part that I was always worried about breaking. We overcompensated on ours:


Last edited by s_forbes : 02-09-2018 at 10:04 PM.
Reply With Quote
  #135   Spotlight this post!  
Unread 02-09-2018, 10:25 PM
Brian M's Avatar
Brian M Brian M is offline
Design Lead
FRC #1360 (Orbit Robotics)
Team Role: CAD
 
Join Date: Feb 2017
Rookie Year: 2012
Location: Ontario, Canada
Posts: 323
Brian M has a reputation beyond reputeBrian M has a reputation beyond reputeBrian M has a reputation beyond reputeBrian M has a reputation beyond reputeBrian M has a reputation beyond reputeBrian M has a reputation beyond reputeBrian M has a reputation beyond reputeBrian M has a reputation beyond reputeBrian M has a reputation beyond reputeBrian M has a reputation beyond reputeBrian M has a reputation beyond repute
Re: Week 5: Teething Pains

Quote:
Originally Posted by s_forbes View Post
Interesting failure mode, I'm curious to see what you guys do to fix it.

This is an elevator part that I was always worried about breaking. We overcompensated on ours:

Why use 2 bearings on that outer block if only 1 contacts the boxtube?
__________________
2016 - Rah Cha Cha Ruckus Winners (3015 & 4039)
2017 - Industrial Design (Durham), Entrepreneurship (McMaster), Quality Award (Ontario DCMPS)
2018 - Georgian District Winner (1305 & 6864) + Innovation in Control, York District Winner (1325 & 6140) + Chairmans Award, Ont DCMP Excellence in Engineering


Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 07:00 AM.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi