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by ichaelm
January 29th, 2012, 1:58 pm
Forum: 2012 Build Events
Topic: Robot Arm C
Replies: 531
Views: 64758

Re: Robot Arm C

I completely understand why you'd want to do that! I had to do that before, just not with RC equipment. I used to control my arm with a gamecube controller, and even if I could remove the springs, I didn't want to have to leave the stick in a certain position just to keep the arm poining a certain w...
by ichaelm
January 21st, 2012, 7:12 am
Forum: 2012 Build Events
Topic: Robot Arm C
Replies: 531
Views: 64758

Re: Robot Arm C

I just want to say that personally, I've had bad experiences with using normal hobby servos to handle loads like this. Even if you balance the torque with counterweights or springs, you still have the weight of your arm resting on the servo horn, unless you use an axle/bearing system to ensure that ...
by ichaelm
January 6th, 2012, 9:42 am
Forum: 2012 Build Events
Topic: Robot Arm C
Replies: 531
Views: 64758

Re: Robot Arm C

I agree that 70 cm of servo wire won't be a problem, assuming your servos aren't huge. About wired vs. wireless systems, the only advantage to using a wireless system (besides the freedom of holding your controller wherever you want, which I see as a very minor issue) is that they often come in stan...
by ichaelm
December 3rd, 2011, 4:13 pm
Forum: 2012 Study Events
Topic: Astronomy C
Replies: 176
Views: 34717

Re: Astronomy C

First of all, Trees, that question isn't a question. But I'll assume that you meant to ask how many times brighter one star was than the other. In that case, the inverse square law is all you'd need. Flavorflav was assuming that it was asking for the difference in astronomical magnitudes which is al...
by ichaelm
December 1st, 2011, 8:06 pm
Forum: 2012 Lab Events
Topic: Keep the Heat B/Thermodynamics C
Replies: 661
Views: 95576

Re: Keep the Heat B/Thermodynamics C

Clay is mostly inorganic, so no. Organic doesn't just mean eco-friendly, it means something very different. Look it up in the glossary of any biology or chemistry textbook (preferably both :))
by ichaelm
November 3rd, 2011, 2:48 pm
Forum: 2012 Lab Events
Topic: Optics B/C
Replies: 559
Views: 66920

Re: Optics B/C

I just spent half an hour trying to figure out what your words meant, including looking through that powerpoint. I couldn't understand. Then I asked a few of my friends. They came up with a different answer each. I will include them in case any of them actually answer the question you were trying to...
by ichaelm
November 2nd, 2011, 5:32 pm
Forum: 2012 Lab Events
Topic: Optics B/C
Replies: 559
Views: 66920

Re: Optics B/C

Two things. First, the sun is brighter in the near infrared than in the visible spectrum, in terms of wattage with respect to wavelength. Second, assuming his thermometer was made primarily of glass, it's important that glass is opaque in infrared even though it's transparent in the visible spectrum...
by ichaelm
October 28th, 2011, 8:35 am
Forum: 2012 Build Events
Topic: Robot Arm C
Replies: 531
Views: 64758

Re: Robot Arm C

I was talking more about a system to translate signals from your input device into signals for your motor drivers. Like a Vex system. This is especially relevant if your motors don't have the drivers and servomechanism built in.
by ichaelm
October 24th, 2011, 8:50 am
Forum: 2012 Build Events
Topic: Robot Arm C
Replies: 531
Views: 64758

Re: Robot Arm C

Speaking of computer control, has anyone here done any work on actually using computer programming to control the arm, such as with VEX, Legos, or some other custom system? I would think it could be a big advantage over traditional servo systems, not just because of easier control but also because o...
by ichaelm
October 22nd, 2011, 10:57 am
Forum: 2012 Lab Events
Topic: Technical Problem Solving C
Replies: 53
Views: 16537

Re: Technical Problem Solving C

Yes, according to the event parameters, event supervisors must provide a list of mathematical relationships, formulas, or constants.

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