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 Post subject: Re: Building a car
PostPosted: Fri 5. Jan 2018 22:01 
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Joined: Tue 7. Oct 2014 22:28
Posts: 55
Hello All
Nice to see you are all still experimenting. I too over Christmas tried to return to the coil setup, I tried two magnets, one magnet, one coil, two coils also and double wound ones (which do help), but the strength is very minimal and as with Wes's original the magnets have to be close to the coil (really close) otherwise there isn't enough strength to pull the steering when needed. on major drawback is magnet strength is related to number of coils and current, but if you do any of this you basically drain the battery more quickly, which is not what we want.
I actually have renewed admiration for what Wes achieved as he said almost every thing you change affects everything else and the mechanism is really on a knife edge to get things working, and even the screw in the back of the coil makes a big difference (An "iron" core focuses the magnetic strength). steering geometry also affects the strength required to operate the steering.
I am back to the servo type steering which has its own issues, but over christmas have now got it to work successfully. The magnet also provides a centre bias to the steering so tends to remove steering shimmy on the straights.
I am very close to releasing the new chassis and electronics for sale using this method. The reason its taken so long is that I wanted to get a car with much better dynamics and an easier setup which i think we now have. everything is now in place so i should have about 5 or so chassis to send out for testing so let me know if you want to be on the list for the first few. I'll probably let these go a little cheaper just to get the ball rolling.

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 Post subject: Re: Building a car
PostPosted: Sat 6. Jan 2018 04:26 
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Joined: Mon 13. Nov 2017 21:40
Posts: 10
Wes , I'm impressed with your servo steering solution. I'm working on a method that uses magnetic repulsion rather than attraction but it's rather more complicated than yours. I'll post a photo when it's farther along. I'm using a servo like yours so maybe I'll try your method also.

I'm afraid reversing the throttle on the transmitter only changes which way is full throttle on the transmitter. There's some info on Utube about reprograming a brushless ESC to provide forward and reverse to a brushed motor. There's lots of small almost free brushless ESCs out there.

Nick


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 Post subject: Re: Building a car
PostPosted: Sun 14. Jan 2018 23:34 
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Joined: Mon 13. Nov 2017 21:40
Posts: 10
Here's my first try at a servo chassis. The servo moves the two side magnets to repel the one in the middle and steer the car. It's all from scratch with the exception of Ned's steering knuckles. It sort of works but needs more development. I need to make it more compact and more adjustable.

Nick


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magracer chassis 3.jpg
magracer chassis 3.jpg [ 53.13 KiB | Viewed 12 times ]
magracer chassis 2.jpg
magracer chassis 2.jpg [ 62.12 KiB | Viewed 12 times ]
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