01-05-2010 00:44

RyanS

Re: pic: 4 Inch Wheel Design

Looks nice. Are you planning to broach the center with a hex or key? If so you might consider indexing the broach so that the "halves" broaches line up. This would allow the halves to be truly interchangeable.

01-05-2010 00:49

Rion Atkinson

Re: pic: 4 Inch Wheel Design

Looks nice to me. ^_^ Course... I'm not the mechanical genus... My questions are only about the CAD program. Which one are you using?

Also, do you think you could get away with fewer spokes?

-Rion

01-05-2010 00:56

MWB

Re: pic: 4 Inch Wheel Design

I am using Solidworks 2009

Yes, i could but i liked the look of 10 versus 6 spokes for some reason.

Yes since my upload i have added the hex broach and the halves line up perfectly. The purpose was to have the halves be interchangeable.

01-05-2010 01:01

R.C.

Re: pic: 4 Inch Wheel Design

Nice Wheel,

How much does it weigh with bolts?

-RC

01-05-2010 01:04

MWB

Re: pic: 4 Inch Wheel Design

0.42lbs With bolts

0.36lbs Without bolts

01-05-2010 01:07

MWB

Re: pic: 4 Inch Wheel Design

Is there any chance that you have the AM Shifter Gen 2 CADDED with the gear teeth? If you do can you send it to me?

Thanks RC

01-05-2010 01:09

sanddrag

Re: pic: 4 Inch Wheel Design

My my that looks mighty familiar. I too wonder about your plans for the bore, and the necessity for symmetrical halves. You might consider not having the bore extend through both halves. Timing/indexing a broach is a pain. Also, you may find it not worth it to have the wheel be two halves at all, if simplifying manufacturing is your goal.

01-05-2010 01:10

Eugene Fang

Re: pic: 4 Inch Wheel Design

Nice! looks kinda familiar! Haha =)



I see you're going "clamp style" for tread, but you need a little groove along your rim that captures the tread so it doesn't fall out (higher quality picture here where you can see the groove better http://604robotics.com/Blog/wp-conte...2/IMG_0296.jpg). I like how you made both halves symmetrical for ease of machining, however, what we do is make them asymmetrical so you can have a locating groove instead of using the screws/axle to center the two halves.

Also, you might be able to get away with less spokes. 7 is a cool number.

Keep up the great work!

01-05-2010 01:12

MWB

Re: pic: 4 Inch Wheel Design

Well i was thinking of broaching it while it was assembled or just simply keying it. The two halves is so that you can clamp the tread along with rivits for a better grip.

01-05-2010 01:16

R.C.

Re: pic: 4 Inch Wheel Design

Ah,

I would try to aim for about ~.3 lbs. How thick and wide are those spokes?


Yes I do have one, when I get home tomorrow I'll make sure to put it up on the CAD Library.

-RC

01-05-2010 01:22

Eugene Fang

Re: pic: 4 Inch Wheel Design

Yeah I agree. As you can see from the pictures I posted, the back of our wheel is just a rim, which saves weight. It simplifies the broaching issue too. By the way, those 6" wheels I posted were 0.28 pounds each.

01-05-2010 01:23

MWB

Re: pic: 4 Inch Wheel Design

Each half has a 1/8 spoke thickness and a 1/4 combined thickness.
The spokes are 1/4 in wide each.

Thanks again RC

01-05-2010 01:25

MWB

Re: pic: 4 Inch Wheel Design

WOW thats light!

01-05-2010 01:32

Bannanakin

Re: pic: 4 Inch Wheel Design

The CAD says it is .28 pounds, but when I weighed one it was .23 pounds.

01-05-2010 01:39

Akash Rastogi

Re: pic: 4 Inch Wheel Design

Psh, 604 needs to bring these babies back.

01-05-2010 10:40

Cory

Re: pic: 4 Inch Wheel Design

There's really no point to making a two piece wheel without having the undercut groove to capture the tread. It won't be any different than a one piece wheel without it.

01-05-2010 15:01

MWB

Re: pic: 4 Inch Wheel Design

Yeah i know ive added it since i just forgot to do it when i took that picture. Thanks Cory

01-05-2010 15:35

=Martin=Taylor=

Re: pic: 4 Inch Wheel Design

Someone explain to me why, in this day and age, anyone would bother making custom wheels.

01-05-2010 15:44

Eugene Fang

Re: pic: 4 Inch Wheel Design

Because they're cool! Although I have to say AM Performance wheels are really good, especially their price. You could get custom wheels about 40% lighter though. If that matters.

http://www.andymark.biz/am-0393.html

01-05-2010 15:52

RMS11

Re: pic: 4 Inch Wheel Design

Ya, we made them this year for weight reasons. Also, Andy Mark 4" performance wheels do not come with the bolt pattern, making direct drive wheels much harder to set up.

01-05-2010 15:56

Cory

Re: pic: 4 Inch Wheel Design

Because we would have spent $1800+shipping to buy AndyMark Performance Wheels this year...and once we got them we would have had to do secondary machining on them anyways.

Instead we made our own for $300 plus ~20 hours of my time.

01-05-2010 16:27

MWB

Re: pic: 4 Inch Wheel Design

How many wheels did you make for yourselves and other teams? Im just curious.

01-05-2010 16:41

R.C.

Re: pic: 4 Inch Wheel Design

Martin,

Cory is definitely right, we spent about $1500 plus shipping for a set of wheels for our bot, practice and rookie team.

They also weighed in at 1lb per wheel for a 6 inch wheel. Even with modd'd IFI wheels they were way tooo heavy.

For next season we will be making custom wheels unless "standard" wheels (2009) make a return.

-RC

01-05-2010 16:42

Cory

Re: pic: 4 Inch Wheel Design

We made a total of 72 wheels.

01-05-2010 16:43

Jamie Kalb

Re: pic: 4 Inch Wheel Design

Hey Cory,

I totally understand and agree with what you're saying, but I'm curious as to how much design time the wheels took. Is that included in that 20 hours? Design time was a huge limiting factor for my team this year, and it was probably the number one reason we used off-the-shelf wheels.

01-05-2010 16:45

Brandon Holley

Re: pic: 4 Inch Wheel Design

Wheels are really not that demanding in terms of "design time". A good wheel can be pumped through CAD, verified with FEA, re-CAD-ed and ready for manufacturing in a couple hours.

-Brando

P.S.- Obviously this could vary depending on the wheels you actually design. I'm just speaking from experience in terms of the wheels I've designed in the past.

01-05-2010 16:47

NickE

Re: pic: 4 Inch Wheel Design

The design of our wheels was based off of previous wheels we have made, although it is the first one-piece 4" wheel. It probably took 20-30 minutes to design the wheel.

01-05-2010 16:49

Akash Rastogi

Re: pic: 4 Inch Wheel Design

Jamie,

The Poofs/RAWC also have years of experience perfecting and optimizing their wheel designs year after year. Their standardized drivetrain which is then adapted to the game on a yearly basis is something that always gives them an edge in both manufacturing time and during the robot design process (much the same as Team 25). If you check out their older wheels you can see a pretty cool "evolution in design" process.

.

01-05-2010 16:52

=Martin=Taylor=

Re: pic: 4 Inch Wheel Design

Our traction wheels came in the 2008 kit. So we didn't spend any money on them (besides registration), and they took 0 hours to make.

The kit wheels are highly under-rated.

I see custom wheels as more of a fashion statement then a practicality. They certainly are impressive and cool Props for making awesome things.

01-05-2010 16:55

Cory

Re: pic: 4 Inch Wheel Design

Our drive system does not lend itself well to the kit wheels. it would have been more work for us to modify them (and less elegant) than making our own.

01-05-2010 17:03

MWB

Re: pic: 4 Inch Wheel Design

Yeah Nick those wheels took me about an hour to design, and im a rookie. So they barely took any time at all.

Thats pretty insane.

01-05-2010 17:07

NickE

Re: pic: 4 Inch Wheel Design

8 blue wheels went to 233 for their practice bot and the 64 black wheels were divided up between 254, 968 & 1868.
It sounds like a ton but they're pretty fast to make when its only 2 operations on the mill.

01-05-2010 17:10

MWB

Re: pic: 4 Inch Wheel Design

Yeah, still alot for a team that has one 3 axis machine from 1990.

01-05-2010 17:26

NickE

Re: pic: 4 Inch Wheel Design

Its a lot for any team, but when other teams make parts for us in return, it all balances out.

01-05-2010 17:39

Akash Rastogi

Re: pic: 4 Inch Wheel Design

A bit off topic, but was team 60 the original source of this type of design?

http://www.chiefdelphi.com/forums/sh...ad.php?t=31304

01-05-2010 18:51

Cory

Re: pic: 4 Inch Wheel Design

Yes.

01-05-2010 21:59

Triple B

Re: pic: 4 Inch Wheel Design

actually Nick, we only have 7 blue wheels, no wonder our practice bot makes such a good left hand turn, oh wait, we should have done that in 08.
mike d

02-05-2010 12:46

O'Sancheski

Re: pic: 4 Inch Wheel Design

If you still haven't found the AM Supershifter's or regular transmissions here's the link

http://team1323.com/cad/pages/motors-gearboxes.html

BTW... The wheel looks very nice... I am working on a few wheel designs and a chassis that I will have posted soon... I hope

02-05-2010 18:05

MWB

Re: pic: 4 Inch Wheel Design

Thanks, but i was looking for the Gen 2 shifter.

02-05-2010 18:22

sgreco

Re: pic: 4 Inch Wheel Design

You can get the steps from the AndyMark Website.

http://www.andymark.biz/am-0076.html

Under CAD files you can download it.

02-05-2010 21:32

MWB

Re: pic: 4 Inch Wheel Design

I have that, but I want the gear teeth. Those are just round with no teeth.

03-05-2010 08:40

Borisdamole

Re: pic: 4 Inch Wheel Design

if you plan on hexing them (as you said you were) I would HIGHLY recommend roughing the hex while the wheel is on the CNC....

Having made hex broached wheels quite a few times, we have found if you rough the hex out with a .250 cutter, then use the broach, it is easier on the broach, and who ever is broaching....

For your design, it would also help orient the hex on all the parts....

06-05-2010 19:32

MWB

Re: pic: 4 Inch Wheel Design

Yeah thanks for the idea. i indexed the broach to one of the spokes