Counting Rotations

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MadCow2357
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Re: Counting Rotations

Postby MadCow2357 » March 9th, 2019, 8:51 pm

Tendan wrote:If the motor is restisting rotation because of the electromagnets, it is probably being short circuited. This could be caused by the braking system you were referring to (an eddy current brake). If you are using an eddy brake again, disengaging the brake should be all you have to do to get it to rotate pretty freely.
If the motor isn’t being shorted, the problem is more likely high inertia and/or high friction in the motor or other parts of the buggy. You could try and fix this in a few ways, including:
1. Replacing the problem part(s). If the part you replace is the motor, your buggy might be able to accelerate faster, since the motor won’t have to overcome as much inertia before moving.
2. Disconnect the motor from the axle. If you are using a coupler with set screws, you could loosen the set screws and make you distance setting with the motor disconnected. Then retighten the set screws before the run. This might not work, depending on your configuration.
I hope this helped. Good luck with your buggy!

I don't think it's an issue of short circuiting or problematic parts - I believe my motor was made that way. According to the website, it has a stall torque of 44 ounces per inch. I'm guessing that it is the reason why I cannot rotate my motor freely. I'll look into motors that have less stall torque, which should function you as described - rotating easily and freely.

The latter of your suggestions won't work in my current configruation, lol.
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Re: Counting Rotations

Postby MadCow2357 » March 9th, 2019, 8:53 pm

(double post - mods please delete)
Last edited by MadCow2357 on March 13th, 2019, 2:00 pm, edited 1 time in total.
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Re: Counting Rotations

Postby invisiblebanana » March 13th, 2019, 12:42 pm

Has anyone calculated the distance that the vehicle would travel for each of the possible target distances?
Or do you just roll the vehicle over the arc during testing and count the rotations then?
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Re: Counting Rotations

Postby MadCow2357 » March 13th, 2019, 1:58 pm

invisiblebanana wrote:Has anyone calculated the distance that the vehicle would travel for each of the possible target distances?
Or do you just roll the vehicle over the arc during testing and count the rotations then?

I would advise against trying to use those distances to calculate your brake setting, since the other factors that can affect your run are numerous and sometimes impossible to predict without extensive testing. It would be easier to test a lot, and base your wheel setting on previous data than use an equation to find the optimal brake setting for every distance.
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Re: Counting Rotations

Postby LittleMissNyan » March 13th, 2019, 2:55 pm

MadCow2357 wrote:
invisiblebanana wrote:Has anyone calculated the distance that the vehicle would travel for each of the possible target distances?
Or do you just roll the vehicle over the arc during testing and count the rotations then?

I would advise against trying to use those distances to calculate your brake setting, since the other factors that can affect your run are numerous and sometimes impossible to predict without extensive testing. It would be easier to test a lot, and base your wheel setting on previous data than use an equation to find the optimal brake setting for every distance.

So I don't know if your Battery Buggies will work like this, but what we do is we set the Battery Buggy at where we want to finish, put a piece of tape on the wheel, and roll the Battery Buggy backwards to the starting line we have, counting the rotations of tape. It makes for a pretty good estimate.
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Re: Counting Rotations

Postby MoMoney$$$;)0) » March 13th, 2019, 7:14 pm

Isn't that illegal?

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Re: Counting Rotations

Postby MadCow2357 » March 13th, 2019, 7:41 pm

LittleMissNyan wrote:
MadCow2357 wrote:
invisiblebanana wrote:Has anyone calculated the distance that the vehicle would travel for each of the possible target distances?
Or do you just roll the vehicle over the arc during testing and count the rotations then?

I would advise against trying to use those distances to calculate your brake setting, since the other factors that can affect your run are numerous and sometimes impossible to predict without extensive testing. It would be easier to test a lot, and base your wheel setting on previous data than use an equation to find the optimal brake setting for every distance.

So I don't know if your Battery Buggies will work like this, but what we do is we set the Battery Buggy at where we want to finish, put a piece of tape on the wheel, and roll the Battery Buggy backwards to the starting line we have, counting the rotations of tape. It makes for a pretty good estimate.

MoMoney$$$;)0) wrote:Isn't that illegal?

Yeah LMN you aren't supposed to do that. You may not roll the buggy on the "track" during competition day, that's a rule.
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Re: Counting Rotations

Postby LittleMissNyan » March 14th, 2019, 6:41 am

MadCow2357 wrote:
LittleMissNyan wrote:
MadCow2357 wrote:I would advise against trying to use those distances to calculate your brake setting, since the other factors that can affect your run are numerous and sometimes impossible to predict without extensive testing. It would be easier to test a lot, and base your wheel setting on previous data than use an equation to find the optimal brake setting for every distance.

So I don't know if your Battery Buggies will work like this, but what we do is we set the Battery Buggy at where we want to finish, put a piece of tape on the wheel, and roll the Battery Buggy backwards to the starting line we have, counting the rotations of tape. It makes for a pretty good estimate.

MoMoney$$$;)0) wrote:Isn't that illegal?

Yeah LMN you aren't supposed to do that. You may not roll the buggy on the "track" during competition day, that's a rule.

I mean not during the competition...... we do that beforehand and just use the number we got at the competition
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Re: Counting Rotations

Postby invisiblebanana » March 14th, 2019, 12:43 pm

MadCow2357 wrote:
invisiblebanana wrote:Has anyone calculated the distance that the vehicle would travel for each of the possible target distances?
Or do you just roll the vehicle over the arc during testing and count the rotations then?

I would advise against trying to use those distances to calculate your brake setting, since the other factors that can affect your run are numerous and sometimes impossible to predict without extensive testing. It would be easier to test a lot, and base your wheel setting on previous data than use an equation to find the optimal brake setting for every distance.


I've already calculated how many times I would need to turn the wheel to rewind the brake for each possible distance interval. What are some of the factors that I need to account for?
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Re: Counting Rotations

Postby MadCow2357 » March 14th, 2019, 1:34 pm

invisiblebanana wrote:I've already calculated how many times I would need to turn the wheel to rewind the brake for each possible distance interval. What are some of the factors that I need to account for?

Just to name a few: skidding (big), wheel slippage, oversteer, understeer, drifting
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Re: Counting Rotations

Postby Tendan » March 14th, 2019, 2:10 pm

invisiblebanana wrote:Has anyone calculated the distance that the vehicle would travel for each of the possible target distances?
Or do you just roll the vehicle over the arc during testing and count the rotations then?

There are various modeling programs that you can use to draw a diagram of the track, with an arc representing the path of the buggy through the cans. You can then find information such as the travel distance of the buggy (length of the arc) and the angle the buggy has to start at. I would only recommend this approach if you have prior experience in 2D or 3D modeling, or if you have someone who could show you how to do it. Going into modeling blind can leave you with really odd/inaccurate results. The software that I've been using is called DraftSight. It's free and has a moderate learning curve if you're already experienced in modeling.

Keep in mind that the numbers you get probably won't be perfect for your buggy. You should use these numbers as a place to start testing. They should be adapted as you test your buggy.

The only downside to this is that you have to make a new diagram for every target distance and every bonus you want to try.

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Re: Counting Rotations

Postby Sarvesh » March 15th, 2019, 12:18 pm

Roll the battery buggy back from target distance to your start point

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Re: Counting Rotations

Postby waffletree » March 15th, 2019, 1:18 pm

Sarvesh wrote:Roll the battery buggy back from target distance to your start point

LMN already suggested this method. It's not allowed at competition, but you can do it before competition
LittleMissNyan wrote:So I don't know if your Battery Buggies will work like this, but what we do is we set the Battery Buggy at where we want to finish, put a piece of tape on the wheel, and roll the Battery Buggy backwards to the starting line we have, counting the rotations of tape. It makes for a pretty good estimate.
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Re: Counting Rotations

Postby invisiblebanana » March 15th, 2019, 1:34 pm

waffletree wrote:
Sarvesh wrote:Roll the battery buggy back from target distance to your start point

LMN already suggested this method. It's not allowed at competition, but you can do it before competition
LittleMissNyan wrote:So I don't know if your Battery Buggies will work like this, but what we do is we set the Battery Buggy at where we want to finish, put a piece of tape on the wheel, and roll the Battery Buggy backwards to the starting line we have, counting the rotations of tape. It makes for a pretty good estimate.


Does that work reliably? @MadCow2357 mentioned that other factors could cause the result from rolling the vehicle to be inaccurate.

MadCow2357 wrote:Just to name a few: skidding (big), wheel slippage, oversteer, understeer, drifting
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Re: Counting Rotations

Postby LittleMissNyan » March 15th, 2019, 2:08 pm

invisiblebanana wrote:
waffletree wrote:
Sarvesh wrote:Roll the battery buggy back from target distance to your start point

LMN already suggested this method. It's not allowed at competition, but you can do it before competition
LittleMissNyan wrote:So I don't know if your Battery Buggies will work like this, but what we do is we set the Battery Buggy at where we want to finish, put a piece of tape on the wheel, and roll the Battery Buggy backwards to the starting line we have, counting the rotations of tape. It makes for a pretty good estimate.


Does that work reliably? @MadCow2357 mentioned that other factors could cause the result from rolling the vehicle to be inaccurate.

MadCow2357 wrote:Just to name a few: skidding (big), wheel slippage, oversteer, understeer, drifting

*shrug* It works pretty well for our buggy, it depends on how your buggy works
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