How do i make this part??

[Foster]

I can't help you on the fabrication of the hubs.

On the other hand they look pretty close to standard bike hubs, so I would visit a few bike shops / repair places and see what they have for replacement hubs. I'd look to see what I could do some minor changes to and get them. The local bike repair guy is pretty clever, I'd explain what I was trying to do and see what he suggests.

It looks like you want to direct drive the hubs, can you get by with driving a small sprocket that's attached by chain to the drive hub of the wheel?

Good luck!

[IKE]

If you really want to do a custom Hub you can get a quote from emachineshop.com

http://www.emachineshop.com/

They have software that you download and then you make the part. It will take a little time to get used to their software and does require some machining knowledge (but not much). The best part is that you pick the processes, material, and quantity, then press quote and TaH DaH! You have a price and you can order it. Typically it takes 3-4 weeks to get custom parts (that is why it isn't the greatest FIRST Resource).

If you have a lathe and some generic tooling and some metal and skill, you can make this yourself. You will then need a mill and a rotary table to get the holes in the hubs concentric. making this part by hand will be difficult and time consuming.

Overally i personally would not re-invent the wheel (pun intended). I would shop around an find a design that fits your needs that you can get to work. If you are making a scooter do you want it to coast? Direct drive may not be good for coasting.

[RaMoore]

That part will be pretty difficult to make with any accuracy if your school's equipment is as poorly maintained as mine! You should try to make a little one, not to scale, just to learn the process and see how it goes.

We make most of our hole patterns using a small rotary table on just a table top mill and you can get pretty good, but it takes practice!

I have used MFG Quote before with reasonable success.

You can select qty, material quality, etc and then upload your design drawings and company's will place bids and then you can award the part. Most companies will even take "make to model" also if you have Inventor/ProE or any models typically that you can convert to .iges or .step. You can get a huge range of prices, but you have to look at the manufacturer very closely!

[artdutra04]

Oooh, that part makes me cringe when I think about actually milling/turning that part.

Does it have to be one solid piece? It would be a lot easier to make that part if it were two halves that bolt/weld together.

[dfukuba]

The part does need to be once piece, this is because the spokes of the bike wheel would be mounted pulling on those smaller holes to keep the wheel tensioned and true.

I wen to my local bike shop the other day to ask him about lacing the wheel, and what he thought about doing this overall (i will agree that bike shop guys really know their stuff). He hadn't seen someone do this before, and wasn't really sure what another reliable way would be to do it.

I will have to check out the MFGquote place. What do you mean by "but you have to look at the manufacturer very closely!"?

emachine shop is nice, i could say it was the first time i used CAD hehe. I've heard that they're pretty expensive, and i would like to have my part before the amount of time it would take for them to make it :"/

this hub will be mounting to two of these guys i don't want to have this wheel cantilevered over the shaft tooo much (this is the reason for the deep holes on each side of the hub.

--Dan

[SuperJake]

Any shop with a good CNC Lathe can turn that out in no-time. The holes around the perimeter are also trivial on even an NC Mill. The trick is the tools you use to build it. You should be able to use Google to find a machine shop in your area that can quote the part (A really good shop will ask for the 3D files to make the part). Who knows - you might even find a new sponsor for your team this way!

Good luck!

[RaMoore]

I would agree that local is typically a better connection.

If that's not an option, what I meant by my word of caution is that not all shops have same quality or service. I didn't have any real problems with the 4 companies I worked with.

MFGquote will get you a good number of quotes (from around the world) in a day or two and they will have a huge range (just a guess $50 - $800) and you'll just need to look up the suppliers rating on the site. It's just like buying anything else online, sometimes the cheapest will only get you a bad product (and sometimes the most expensive will). Look at local or regional bids and to keep the cost reasonable correctly dimension your drawing with reasonable tolerances.