Brake system

rajofin
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Re: Brake system

Postby rajofin » Wed Dec 13, 2017 9:49 pm

Our motor does not move without giving power to it and the way we built our buggy, wing nut isn't free to move backwards without rotating wheels. Can we have another set of batteries that we could use to move the motor in reverse (essentially making wingnut move backwards)? Will it be allowed or not at the competition. Hope I made my question clear, let me know if it is not.

shrewdPanther46
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Re: Brake system

Postby shrewdPanther46 » Wed Dec 13, 2017 10:04 pm

rajofin wrote:Our motor does not move without giving power to it and the way we built our buggy, wing nut isn't free to move backwards without rotating wheels. Can we have another set of batteries that we could use to move the motor in reverse (essentially making wingnut move backwards)? Will it be allowed or not at the competition. Hope I made my question clear, let me know if it is not.

Not sure what you mean when you say "without giving power to it"...

I think I understand what you are asking. I would think that would be allowed (my partner and I are also considering this because rotating the wheels slowly can be painful). I think its just a tool and either way, its not really part of the buggy itself, so I see no reason as to why it would not be allowed.
salty

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Re: Brake system

Postby rajofin » Thu Dec 14, 2017 12:07 am

Thank you for your response. Just to explain myself, I thought the motor shaft would be free to rotate by hand but it does not. It does not move until current is passed through it. So to move the wheels backward, shaft needs to move which does not happen until we move the motor shaft backwards with another set of batteries.

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Re: Brake system

Postby shrewdPanther46 » Thu Dec 14, 2017 12:23 am

rajofin wrote:Thank you for your response. Just to explain myself, I thought the motor shaft would be free to rotate by hand but it does not. It does not move until current is passed through it. So to move the wheels backward, shaft needs to move which does not happen until we move the motor shaft backwards with another set of batteries.

Now I'm curious as to what kind of motor you are using. As far as I know, I thought DC motors are all "free to rotate by hand", and in fact, act as DC generators when turned (they produce a current across the armature of the motor). Unless if you are leaving some sort of load after disconnecting power from your motor, there is no reason for a dc motor to resist change from being turned. Could you please explain to me how your circuit is set up:? ? I've never seen anything like that, so I'm super curious as to what motor you are using/how your circuit is set up.
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Re: Brake system

Postby Almandine » Mon Dec 18, 2017 3:53 am

The braking system that I like to use is a Soft Gamma Repeater 1806-20. It works very well, and causes almost no skidding.
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Re: Brake system

Postby GameMaster » Wed Feb 07, 2018 12:00 pm

Can we use electromagnetism for breaking system using wire and metal pieces, please let me know? Have posted my question in soinc.org and still waiting for their response.

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Re: Brake system

Postby shrewdPanther46 » Wed Feb 07, 2018 2:39 pm

GameMaster wrote:Can we use electromagnetism for breaking system using wire and metal pieces, please let me know? Have posted my question in soinc.org and still waiting for their response.


I mean, simply cutting the power from the motor is an electromagnetic brake lol
So everyone's car uses electromagnetic braking (specifically, Eddy current brakes)

But if your gonna try something more legit, without knowing your specifics, I am 99.99999999% sure whatever you plan on doing will be fine rules wise...
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Re: Brake system

Postby M017 » Fri Mar 30, 2018 5:30 pm

shrewdPanther46 wrote:Anyone have advice on how to reduce skidding and get within a millimeter of the target distance consistently using a wingnut microswitch braking method (Other than just trial and error)? Also anyone have any ideas as to what specific microswitch would benefit the vehicle (ex: hinge roller or without)?

Thanks

If your car is going fast enough make sure that you have the motor cut out (but not brake) about 50-100cm before the target, so when it does brake it's slowed down. Put small protractors on the wheels and work out a formula for figuring out how many full turns and degrees it will have to go and turn it accordingly
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Re: Brake system

Postby MadCow2357 » Sat Mar 31, 2018 12:06 pm

builder83 wrote:My vehicles motor does not require the use of all 8 batteries. I actually exploded one by overloading a 6v motor...

So now I am curious if there are different brake systems that are more accurate than a wingnut hitting a switch since I have batteries available. I could not find any online resources showing any. I was thinking of something like a photogate system that shuts off circuit when wingnut passes by and cuts through light path... but not sure if this would work.

Anybody experiment with other brake systems?

The high school in our town did a winch system thing last year for Electric Vehicle. The drive motor had a small wheel thing that was attached to string, and the axle also had a winch wheel thing. When the motor started running, the thread that started on the axle's winch wheel thing would start wrapping around the motor's winch wheel thing. After the string ran out on the axle's winch wheel, the motor's winch wheel would have all of the string, and the vehicle would stop do to a wingnut system in the back. The motor keeps spinning, but that does not matter since the motor stops driving the motor. This is not a complete solution to your question, as it still implements a wingnut braking system, but the wingnut does not have to hit a micro switch. Sorry that I said winch wheel thing so many times, because I do not know what to call it. Maybe this is the solution you are looking for.
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Re: Brake system

Postby drcubbin » Sat Mar 31, 2018 12:13 pm

MadCow2357 wrote:
builder83 wrote:My vehicles motor does not require the use of all 8 batteries. I actually exploded one by overloading a 6v motor...

So now I am curious if there are different brake systems that are more accurate than a wingnut hitting a switch since I have batteries available. I could not find any online resources showing any. I was thinking of something like a photogate system that shuts off circuit when wingnut passes by and cuts through light path... but not sure if this would work.

Anybody experiment with other brake systems?

The high school in our town did a winch system thing last year for Electric Vehicle. The drive motor had a small wheel thing that was attached to string, and the axle also had a winch wheel thing. When the motor started running, the thread that started on the axle's winch wheel thing would start wrapping around the motor's winch wheel thing. After the string ran out on the axle's winch wheel, the motor's winch wheel would have all of the string, and the vehicle would stop do to a wingnut system in the back. The motor keeps spinning, but that does not matter since the motor stops driving the motor. This is not a complete solution to your question, as it still implements a wingnut braking system, but the wingnut does not have to hit a micro switch. Sorry that I said winch wheel thing so many times, because I do not know what to call it. Maybe this is the solution you are looking for.

I have not seen anything that outperforms the wingnut. If designed properly, it is fairly accurate.

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Re: Brake system

Postby drcubbin » Sat Mar 31, 2018 12:15 pm

shrewdPanther46 wrote:
GameMaster wrote:Can we use electromagnetism for breaking system using wire and metal pieces, please let me know? Have posted my question in soinc.org and still waiting for their response.


I mean, simply cutting the power from the motor is an electromagnetic brake lol
So everyone's car uses electromagnetic braking (specifically, Eddy current brakes)

But if your gonna try something more legit, without knowing your specifics, I am 99.99999999% sure whatever you plan on doing will be fine rules wise...

But what about that pesky 0.00000001%?

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Re: Brake system

Postby MadCow2357 » Sat Mar 31, 2018 12:31 pm

drcubbin wrote:
MadCow2357 wrote:
builder83 wrote:My vehicles motor does not require the use of all 8 batteries. I actually exploded one by overloading a 6v motor...

So now I am curious if there are different brake systems that are more accurate than a wingnut hitting a switch since I have batteries available. I could not find any online resources showing any. I was thinking of something like a photogate system that shuts off circuit when wingnut passes by and cuts through light path... but not sure if this would work.

Anybody experiment with other brake systems?

The high school in our town did a winch system thing last year for Electric Vehicle. The drive motor had a small wheel thing that was attached to string, and the axle also had a winch wheel thing. When the motor started running, the thread that started on the axle's winch wheel thing would start wrapping around the motor's winch wheel thing. After the string ran out on the axle's winch wheel, the motor's winch wheel would have all of the string, and the vehicle would stop do to a wingnut system in the back. The motor keeps spinning, but that does not matter since the motor stops driving the motor. This is not a complete solution to your question, as it still implements a wingnut braking system, but the wingnut does not have to hit a micro switch. Sorry that I said winch wheel thing so many times, because I do not know what to call it. Maybe this is the solution you are looking for.

I have not seen anything that outperforms the wingnut. If designed properly, it is fairly accurate.

I personally am using the wingnut, the winch wheel system is just something the high school coach suggested to me.
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Re: Brake system

Postby drcubbin » Sat Mar 31, 2018 12:44 pm

MadCow2357 wrote:
drcubbin wrote:
MadCow2357 wrote:The high school in our town did a winch system thing last year for Electric Vehicle. The drive motor had a small wheel thing that was attached to string, and the axle also had a winch wheel thing. When the motor started running, the thread that started on the axle's winch wheel thing would start wrapping around the motor's winch wheel thing. After the string ran out on the axle's winch wheel, the motor's winch wheel would have all of the string, and the vehicle would stop do to a wingnut system in the back. The motor keeps spinning, but that does not matter since the motor stops driving the motor. This is not a complete solution to your question, as it still implements a wingnut braking system, but the wingnut does not have to hit a micro switch. Sorry that I said winch wheel thing so many times, because I do not know what to call it. Maybe this is the solution you are looking for.

I have not seen anything that outperforms the wingnut. If designed properly, it is fairly accurate.

I personally am using the wingnut, the winch wheel system is just something the high school coach suggested to me.

Good. We have used the winch wheel on scramble with mixed (mostly bad) results, but I am sure anything can be made to perform better :D

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Re: Brake system

Postby MadCow2357 » Sat Mar 31, 2018 12:49 pm

My wingnut is not activating the microswitch. It just hits it for a second, and then travels over the microswitch. Ideas?
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Re: Brake system

Postby cheese » Sat Mar 31, 2018 4:29 pm

Make the lever of the micro switch longer, glue a piece of plastic or someting.
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