Electric Vehicle C

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NilaiVemula
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Re: Electric Vehicle C

Post by NilaiVemula » March 26th, 2017, 9:04 pm

Bazinga+ wrote:
NilaiVemula wrote:
Bazinga+ wrote:Here is my Electric Vehicle as well as the steering mechanism I used:

https://www.youtube.com/watch?v=pKC8MYR ... e=youtu.be

I highly recommend using the caliper steering method as it has worked very well for me and others that have used it, with the top 3 vehicles at MIT invitationals using this mechanism.
How did you attach the bearing block to the caliper?
Epoxy and metal clips. There was no cleaner way to do it since you can't drill into a hardened steel caliper :'(
You can try using a carbide tipped mason drill bit.
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Re: Electric Vehicle C

Post by NilaiVemula » March 26th, 2017, 9:06 pm

NilaiVemula wrote:
Bazinga+ wrote:
NilaiVemula wrote:
How did you attach the bearing block to the caliper?
Epoxy and metal clips. There was no cleaner way to do it since you can't drill into a hardened steel caliper :'(
You can try using a carbide tipped mason drill bit.
Sorry for the typo. *masonry
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Re: Electric Vehicle C

Post by Bazinga+ » March 27th, 2017, 4:15 am

NilaiVemula wrote:
Bazinga+ wrote:
NilaiVemula wrote:
How did you attach the bearing block to the caliper?
Epoxy and metal clips. There was no cleaner way to do it since you can't drill into a hardened steel caliper :'(
Thanks. Also, what kind of gears did you use between the encoder and the axle? They look really fancy.
That is a metal bevel gear and a crown gear I found in some toy.
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Re: Electric Vehicle C

Post by chalker » March 27th, 2017, 5:28 am

NilaiVemula wrote:
NilaiVemula wrote:
Bazinga+ wrote:
Epoxy and metal clips. There was no cleaner way to do it since you can't drill into a hardened steel caliper :'(
You can try using a carbide tipped mason drill bit.
Sorry for the typo. *masonry
Don't forget to use cutting fluid too. That stuff is amazing in what it can help cut into.

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Re: Electric Vehicle C

Post by NilaiVemula » March 27th, 2017, 2:23 pm

What are some effective ways to reduce skidding? We have tried balloons around the wheels, friction tape, and electrical tape, all with no avail.
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Re: Electric Vehicle C

Post by NilaiVemula » March 27th, 2017, 2:28 pm

Has anyone tried using a PID loop to correct for any error in their Arduino distance programming? If so, has it helped significantly decrease your distance score?
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Re: Electric Vehicle C

Post by windu34 » March 27th, 2017, 4:10 pm

NilaiVemula wrote:What are some effective ways to reduce skidding? We have tried balloons around the wheels, friction tape, and electrical tape, all with no avail.
Make your vehicle heavier
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Re: Electric Vehicle C

Post by 4Head » March 27th, 2017, 7:15 pm

windu34 wrote:
NilaiVemula wrote:What are some effective ways to reduce skidding? We have tried balloons around the wheels, friction tape, and electrical tape, all with no avail.
Make your vehicle heavier
This and accelerate and decelerate gradually if you aren't doing so
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Re: Electric Vehicle C

Post by dcrxcode » March 27th, 2017, 7:32 pm

NilaiVemula wrote:Has anyone tried using a PID loop to correct for any error in their Arduino distance programming? If so, has it helped significantly decrease your distance score?
I wrote some PID code but didn't implement it because there's not much of a point when you can get centimeter accuracy using an encoder. From what I've read, tuning would also be a pain that wouldn't be worth the time.

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Re: Electric Vehicle C

Post by Bazinga+ » March 28th, 2017, 4:16 am

windu34 wrote:
NilaiVemula wrote:What are some effective ways to reduce skidding? We have tried balloons around the wheels, friction tape, and electrical tape, all with no avail.
Make your vehicle heavier
Making the vehicle heavier will not help because your maximum acceleration and decelleration depends only on the traction between the wheels and the floor, the mass of the car cancels out (a(max)= F/m=mgu/m=gu, where u is the friction coefficient) The only way to reduce skidding is to get high traction wheels (most everybody uses 'banebots' wheels, they work great) or to accelerate more gradually.
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