Battery Buggy B

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bernard
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Battery Buggy B

Postby bernard » Thu Aug 31, 2017 7:20 pm

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Re: Battery Buggy B

Postby cheese » Thu Sep 14, 2017 8:44 pm

Well I guess I should get this forum going. I think forums are one of the best places to learn from so I suggest others to join in!

Looking at the rules, It looks to me that the main variable is the distance. What do you think of braking systems?
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Re: Battery Buggy B

Postby SPP SciO » Tue Oct 03, 2017 4:48 pm

Regarding rule 3.g - wheels in their entirety must fit in a 30 x 60 cm space - Would it be correct to imagine a 30x60 box drawn on the floor, and the "footprint/shadow" of all wheels has to be contained within? Or is it possible that test would allow some configurations that are actually prohibited?

My students used a 12" threaded rod as an axle for a prototype, which is slightly longer than 30.0 cm. The wheels would fit in the box, and I wouldn't think that the axle ends sticking out would count as part of "wheels in their entirety" - is that a correct assumption?
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Re: Battery Buggy B

Postby kinghong1970 » Tue Oct 03, 2017 5:09 pm

hacksaw? just to make sure you don't leave anything to interpretation of the event supervisor?

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Re: Battery Buggy B

Postby SPP SciO » Tue Oct 03, 2017 6:13 pm

kinghong1970 wrote:hacksaw? just to make sure you don't leave anything to interpretation of the event supervisor?


I'm sure that's doable, but in my experience, it's really tricky getting anything screwed on afterwards; there's usually some bending or thread deformation. It may be easier to find a shorter, pre-cut threaded rod. 12" is a pretty common size though, and threaded rods are pretty popular axles, so I'm guessing more than a few teams will encounter this eventually.
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Re: Battery Buggy B

Postby bernard » Tue Oct 03, 2017 6:16 pm

SPP SciO wrote:
kinghong1970 wrote:hacksaw? just to make sure you don't leave anything to interpretation of the event supervisor?


I'm sure that's doable, but in my experience, it's really tricky getting anything screwed on afterwards; there's usually some bending or thread deformation. It may be easier to find a shorter, pre-cut threaded rod. 12" is a pretty common size though, and threaded rods are pretty popular axles, so I'm guessing more than a few teams will encounter this eventually.

Cut the rod using a hacksaw at a slightly longer length, then sand off threads that have been damaged. Use appropriate PPE to avoid eye or lung irritation.
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Re: Battery Buggy B

Postby cool hand luke » Tue Oct 03, 2017 8:13 pm

Thread a nut on from the other end, spin it all the way down.

Thread 2 nuts on the other end, and lock them against each other. Put a wrench on the two locked together and one on the other nut. Spin it off and it will fix the threads.


That's the redneck way if you don't have access to a tap and die set. But those aren't hard to come by either.

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Re: Battery Buggy B

Postby kinghong1970 » Tue Oct 03, 2017 8:52 pm

when clamping on vise, clamp the short end where you want to cut off, then use the vertical surface of the vise as a guide for your saw...

i manually "chamfer" the cut end and it usually helps grind out the ugly threads... but as said, thread the nut from other end.

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Re: Battery Buggy B

Postby builder83 » Fri Oct 06, 2017 2:20 am

Wheels and axles are too different things. I think you are correct in assuming the axle or any other part of the vehicle may extend beyond the wheel dimensions.

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Re: Battery Buggy B

Postby retired1 » Wed Oct 11, 2017 5:30 pm

AliExpress has ball bearing thrust washers in various sizes -- 10 sets for $6.50. Needle bearing thrust washers are also available for $7 something for a set of 10. They are great for allowing a closer fit and still reduce friction.

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Re: Battery Buggy B

Postby shrewdPanther46 » Fri Oct 13, 2017 12:01 am

I would also consider bushings, as they are considerably lighter and meant for high impact scenarios (braking). They are also superior for lateral loads, and provide much more stability while being cheaper and easily installed.
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Re: Battery Buggy B

Postby retired1 » Wed Oct 18, 2017 9:23 pm

shrewdPanther46 wrote:I would also consider bushings, as they are considerably lighter and meant for high impact scenarios (braking). They are also superior for lateral loads, and provide much more stability while being cheaper and easily installed.


Any decent bearing will stand all of the abuse that a battery buggy will give it.
Bushings are definitely cheaper and on some set ups a lot easier to install. There are some very low frictions ones available in nearly any ID.

If you want to use plastic pillow blocks, PM me and I will tell you how to get them for free. My second prototype has a 10 mm bore that I am using flanged 10 mm ball bearings in. Would have saved time energy and weight if I had just gone with the plastic bore. With the weight savings, I now think that it would have been more effective.

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Re: Battery Buggy B

Postby samuel.barlow003 » Fri Nov 10, 2017 4:25 pm

What are you guys using for the frame?

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Re: Battery Buggy B

Postby shrewdPanther46 » Fri Nov 10, 2017 4:32 pm

I am using thin plywood. I have seen metal chassis as well.
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Re: Battery Buggy B

Postby memebigboy » Mon Nov 20, 2017 7:42 pm

I got a score of a 100. Can I just bribe them with my solar panel pics? :D :geek: (Looking for a strong man)
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