build ideas

rajofin
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Re: build ideas

Post by rajofin » October 31st, 2017, 11:50 am

Thank you for your help..really appreciate it!!!

shrewdPanther46
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Re: build ideas

Post by shrewdPanther46 » October 31st, 2017, 1:22 pm

no problem. let me know how it goes

rajofin
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Re: build ideas

Post by rajofin » November 12th, 2017, 6:16 am

shrewdPanther46 wrote:no problem. let me know how it goes
I think you got 600 rpm since you didn't account for gear ratio reduction. With 4:1 reduction, we will need around 2400 rpm. Isn't this right or I am on a wrong path?

Also, I see in many videos wheels used are as https://www.youtube.com/watch?v=SeO5pAGueIA. Any idea where to get those. Couldn't find them on homedepot unless I am getting confused. TIA.

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Re: build ideas

Post by shrewdPanther46 » November 12th, 2017, 7:07 am

rajofin wrote:
shrewdPanther46 wrote:no problem. let me know how it goes
I think you got 600 rpm since you didn't account for gear ratio reduction. With 4:1 reduction, we will need around 2400 rpm. Isn't this right or I am on a wrong path?

Also, I see in many videos wheels used are as https://www.youtube.com/watch?v=SeO5pAGueIA. Any idea where to get those. Couldn't find them on homedepot unless I am getting confused. TIA.
I made the assumption of direct gearing. Depending on the mass of your vehicle (and torque of the motor), and the optimum speed vs. torque ratio for your specific car, you will need different gear ratios. I suggest not thinking too hard right now about your ratio and just buy a generally high quality motor, and then toy around with your ratios. But yes, you are generally thinking along the right path.

Those wheels are banebots wheels. Banebots.com sells them

ramnath.t@gmail.com
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Re: build ideas

Post by ramnath.t@gmail.com » November 29th, 2017, 5:01 pm

Could you please suggest how to attach the BaneBots wheel to the 1/4 in threaded rod.

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Re: build ideas

Post by retired1 » December 1st, 2017, 4:00 pm

You have 2 options. Use T80 wheels which can have a 1/4 bore hub (twice as wide a tire) -- Or buy 6 mm bore hubs for the T40 wheels. These have a .236 bore and the max diameter of 1/4 threaded rod is .242" .
This can very easily be reduced with a drill motor and a file or sand paper. (and you will get a nice snug fit).
I would not try to drill out the hub to the minorly larger size.

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Re: build ideas

Post by SPP SciO » December 3rd, 2017, 11:19 am

ramnath.t@gmail.com wrote:Could you please suggest how to attach the BaneBots wheel to the 1/4 in threaded rod.
You would use a 1/4” banebots hub. www.banebots.com/category/T81H_INCH.html It’s expensive, but they do seem to be the wheel of choice for all wheeled events (scrambler, electric vehicle, maybe mousetrap cars?) so it’s probably not a bad investment.
Coach
MS 821 Sunset Park Prep
http://www.sppscio.com

shrewdPanther46
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Re: build ideas

Post by shrewdPanther46 » December 3rd, 2017, 11:21 am

i believe they don't sell 1/4 inch adapters, so it could be accomplished by 3d printing.

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Re: build ideas

Post by retired1 » December 3rd, 2017, 8:10 pm

They advertise them at $4.50 each, so unless they are out of stock or discontinued, they are available.

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Re: build ideas

Post by retired1 » December 6th, 2017, 9:55 am

shrewdPanther46 wrote:i believe they don't sell 1/4 inch adapters, so it could be accomplished by 3d printing.
If you are going to 3d print an adapter I would make it with a small flange to keep the wheel from moving in, it would need a set screw hole and it would need a method of keeping the wheel on the hub. They use clips. If it were me, I would look at a mini clevis / retaining pin or similar.
A reverse of this would be to put the flange on the outside and a model airplane wheel collar on the inside.
It still needs the set screw port/hole.

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