Forum: General Forum
01-15-2008, 03:17 AM
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Replies: 25
Views: 3,881
Re: For FRC Student Machinists
I started FIRST a while back not knowing CAD or machining. My tolerance was jigsaw and +- 0.050
Then I got some experience, made some plates and learned to mill on a junky benchtop mill. Tolerance...
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Forum: Technical Discussion
11-14-2007, 11:40 PM
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Replies: 43
Views: 4,520
Re: Cool Frame Ideas?
side panels:
1" thick lightweight aluminum honeycomb, laminated to high density carbon fiber composite sheets on either side of the honeycomb.
internal frame: some 1x1x1/16" box beams to keep the...
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Forum: Technical Discussion
11-14-2007, 11:19 PM
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Replies: 10
Views: 1,872
Re: IFI Traction Wheel stationary?
if you do end up machining your axles out of 1/2" hex, machine it as little as possible. it is very difficult to cut a long, precise diameter in steel hex. One of the transmissions I did earlier...
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Forum: Regional Competitions
03-19-2007, 11:30 PM
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Replies: 157
Views: 11,584
Re: 2007 Davis Sacramento Regional
I'll be at Davis, volunteering. Reffing or inspecting or both, dunno yet.
Davis will be a very tough regional, because most of the teams going there had their first regional at SVR, and will have...
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Forum: Motors
03-15-2007, 03:06 PM
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Replies: 3
Views: 3,309
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Forum: Technical Discussion
03-14-2007, 02:44 AM
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Replies: 8
Views: 1,456
Re: Swerve Module Question
When my team did swerve, we made the gearbox with a steel shaft sticking out the top, and used 2 radial and 2 thrust bearings on each. This was overkill, we realized lated we could have just used...
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Forum: Robot Showcase
02-26-2007, 04:16 AM
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Replies: 19
Views: 3,943
Re: All of Team 100's hard work
awesome looking bot this year guys
seems like you guys liked 2 speed last year and kept it up... hope to see you guys at davis
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Forum: Technical Discussion
02-18-2007, 03:52 PM
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Replies: 2
Views: 966
Re: FRC 48: Transmission Issue
What happens when you shift when the motor speed is really low? From what you posted, I'm taking that the dog is sticky on the hex shaft and/or the servo isnt strong enough to shift. As the servos...
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Forum: Technical Discussion
02-07-2007, 07:56 PM
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Replies: 13
Views: 1,995
Re: pic: 114 2 speed Gearbox
I love how you use aluminum hex stock as your gearbox spacers. Also, I'm guessing you're using this gearbox to direct drive your wheels, right?
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Forum: Extra Discussion
02-05-2007, 01:45 PM
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Replies: 15
Views: 3,766
Re: pic: 1072 Teaser #3
looks yummy. well after much of my criticism and speculation if it would be pulled off, I'm glad you guys went for what you wanted to do and actually put it together. I'll be at Davis and I'll get to...
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Forum: Technical Discussion
01-29-2007, 05:33 PM
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Replies: 15
Views: 2,793
Re: Welding Aluminum MIG or TIG?
1. you need aluminum feed wire
2. you need pure argon gas (not CO2)
3. If you're welding a chassis, and you weld the top side first and then the bottom, the entire chassis will curve upwards. Hence,...
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Forum: Motors
01-06-2007, 01:57 PM
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Replies: 41
Views: 27,125
2007 Motor Specs
This thread is for people to post specs of the 2007 motors.
New motors: the two banebots motors. spec spec spec!
I'm off to work spec-ing them up, will post.
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Forum: Technical Discussion
12-23-2006, 10:54 PM
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Replies: 62
Views: 9,386
Re: Standard vs. Custom Frame
Custom frames are by far the superior in performance, lightweight and strong if well designed.
However, you must design everything first. Randomly drilling mounting holes afterwards with a...
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Forum: Technical Discussion
11-30-2006, 02:57 AM
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Replies: 12
Views: 1,611
Re: Mecanum Suspensions
remember when you weld a frame, it warps because of thermal expansion. In 2005 my team had a frame with a lot of welds. Did one side first, flipped over and did the other side. When it cooled down,...
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Forum: Technical Discussion
10-29-2006, 11:52 PM
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Replies: 54
Views: 5,780
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Forum: Technical Discussion
07-30-2006, 03:30 AM
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Replies: 15
Views: 4,308
Re: Gearing That Cannot Overcome Static Friction
Oh its pretty hard to make a robot not move because its so geared up. Stall torque is so high that it creeps a bit and then kills your breakers. Ive tried it, direct driving 4 CIMS to six inch...
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Forum: Technical Discussion
07-23-2006, 02:27 AM
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Replies: 6
Views: 1,217
Re: Gear alternatives
Aluminum gears, alloy 2024. If you want, anodize them.
Or just take the gear to a drill press and cut some holes. Dont machine lightening holes... too expensive. Just mark it up using cad, and cut...
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Forum: Technical Discussion
07-21-2006, 08:23 PM
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Replies: 19
Views: 24,632
Re: Cutting Lexan
Just a note... acrylic is the real name for Plexiglass. Just like polycarbonate is the same thing as Lexan. These are just registered names of the same plastic.
But yea. Laser cutting works fine,...
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Forum: Technical Discussion
07-20-2006, 11:50 PM
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Replies: 19
Views: 24,632
Re: Cutting Lexan
Remember, Lexan is another name for polycarbonate. Acrylic is... another name for acrylic. Polycarb cuts well with a table saw, acrylic does not. Acrylic melts, shatters, etc. Cut it with a bandsaw...
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Forum: Technical Discussion
06-20-2006, 10:09 PM
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Replies: 8
Views: 2,300
Re: Dual wheel per axle set crab-steer concept
I have pondered the though for quite a while as well. I see the following pros with the design i came up with: you can use small wheels (about 2" diameter) with a differential in between. Also, you...
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Forum: Technical Discussion
06-20-2006, 09:58 PM
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Replies: 8
Views: 2,364
Re: pic: Mecanum Wheel Project - Rev. E
looks fragile. any real life wheels for you to test with? be sure to hammer them a few times with another robot or something, make sure they wont die in competition.
edit: i read the other thread on...
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Forum: Technical Discussion
06-17-2006, 01:44 AM
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Replies: 4
Views: 2,107
Re: pic: 1662's test tranny 5
MY team did this style shifter once. We were running it on an arm, so the torque was a lot higher. We used .375" diameter pins, which were just in a drilled .375" hole with retaining compound. The...
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Forum: Technical Discussion
05-26-2006, 12:05 AM
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Replies: 31
Views: 3,594
Re: Hex Broach Options?
Go to a waterjet shop.
Ask them to demo their waterjet.
By cutting some 1/2" hexes in 1" steel.
And ask if you can keep it as a souvenier.
Proceed.
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Forum: Technical Discussion
04-25-2006, 12:36 PM
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Replies: 31
Views: 7,822
Re: Pic: Easy to make mecanums..
As of now the lab stops are on bolts. This was just for the picture :P
We are in the process of ordering a bunch of .250 ID 1" length bushings to put in all the rollers. They will then run on a...
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Forum: Technical Discussion
04-20-2006, 12:51 AM
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Replies: 31
Views: 7,822
Re: Pic: Easy to make mecanums..
These wheels are for prototyping. We are going to have two such wheels, and two mirrored (and of course spares) on a robot. They will be run direct driven off four KOP transmissions with encoders on...
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I'm sure they liked the size and power output but disliked when they were on fire. - notmattlythgoe [more] 
