It's About Time C
- Rosh93
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Re: It's about time
Well I've been reading this discussion - and it seems a lot of you are using pendulums. Are you just using a simple pendulum with no escapement then? Like you just count the number of swings yourself?
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Western New York 2010 Regionals
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Re: It's about time
I've been wondering-with the constraints given, do you think a pendulum without an escapement mechanism will last 5 minutes? Im inclined towards a no on that...I was also wondering about metronome-like devices, with a counter weight, but I doubt that will also hold up for a max of 5 minutes. This is my first year, and I had very short notice(2 weeks), anyone have some ideas? I developed a spring-based idea, but it seems that with the time left before competition a water clock is the best bet. I've figured a pretty easy way t compensate for the pressure inconsistency in water clocks, but I don't think they'll work out very well to .1 of a second. :-/
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- kmeister87
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Re: It's about time
Careful with a water clock; they can be harder than you think. My partner and I spent many many many hours trying to get consistent data; often it'd be great and then start being really erratic. We think we figured it out... but think it through before you go down that road.SkInventor wrote:I've been wondering-with the constraints given, do you think a pendulum without an escapement mechanism will last 5 minutes? Im inclined towards a no on that...I was also wondering about metronome-like devices, with a counter weight, but I doubt that will also hold up for a max of 5 minutes. This is my first year, and I had very short notice(2 weeks), anyone have some ideas? I developed a spring-based idea, but it seems that with the time left before competition a water clock is the best bet. I've figured a pretty easy way t compensate for the pressure inconsistency in water clocks, but I don't think they'll work out very well to .1 of a second. :-/
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Re: It's about time
If you make a long enough pendulum with low friction it will last for over 5 minutes. It is also important to have a heavy bob on the end.
When it comes to the future, there are three kinds of people: those who let it happen, those who make it happen, and those who wonder what happened.
- Rosh93
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Re: It's about time
Yes but with a longer pendulum I thought the period would be too long. Therefore can you get an accurate measure of time to be close to the .1 sec requirement? How would you read the final place of the pendulum and correspond it to the time if it's not at the end of its swing?
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Re: It's about time
The short answer would be yes. If you were ever in band you learned how to subdivide a beat. This same priciple can be applied.
When it comes to the future, there are three kinds of people: those who let it happen, those who make it happen, and those who wonder what happened.
- Jazzy09
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Re: It's about time
Is anyone interested in trading tests with me? the best way to find out what you need to learn more about is by doing practice tests
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-Lisa Edmondson
-Lisa Edmondson
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Re: It's about time
I have a question about the parameters of this competition. In the rules it clearly states that the entire timing mechanism must fit inside of an 80x80x80cm cube. I am using a pendulum with a falling weight to keep the swinging arm in motion. In order to reach a full 5 minutes my weight must fall 140cm. Will we be allowed to set our timers on top of a table/lab station during the competition? I can always lengthen my pendulum's arm in order to get 5minutes in 80cm of drop but that will make it much less accurate. If we are permitted to set the 'complete timer' ontop of a table than I can probably get away without lengthening the period.
- Sheogorath
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Re: It's about time
The rules state that it must fit within the 80cm^3 box at impound, however it is able to go beyond that during the competition. You should be able to set it up on a table at the test.
2007 Events: Remote Sensing, Astronomy, Fermi Questions, SumoBots
2008 Events: Remote Sensing, Astronomy, Herpetology, SumoBots, Forensics
2009 Events: Remote Sensing 3, Astronomy 2, Fossils 2, Sumobots 1, It's About Time 1, Chem Lab 2
2008 Events: Remote Sensing, Astronomy, Herpetology, SumoBots, Forensics
2009 Events: Remote Sensing 3, Astronomy 2, Fossils 2, Sumobots 1, It's About Time 1, Chem Lab 2
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