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Unread 24-04-2010, 01:11
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Brandon Holley Brandon Holley is offline
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Re: pic: How 125 is rolling this year...

Quote:
Originally Posted by Andy Bradley View Post
Those wheels look sweet, and would be a great off-season project. I looked at the smooth-on site that you mentioned, and found a wide variety of products. Can you tell me exactly which silicone (for the mold) and which urethane (for the wheel) you used? Is it the smooth-cast 305 plastic in the 00M00 30 silicone rubber as shown in their video? Also, what type of fiberglass did you add? Thanks in advance.
The mold was made from Mold Max 30. That is the "multipurpose" silicone, that can be used for pretty much anything. I've used other varieties, but the Mold Max 30 is just awesome stuff and super simple to use. The wheel was made from task 9 urethane. I've had less experience using the rigid urethanes, like the task series, but from my experiences with it in these wheels, it is also very good stuff.

The fiberglass we used was just simple fiberglass cloth you would buy from home depot/lowe's and then chopped via scissors into ~1/2" long strands and added to the urethane.



Quote:
Originally Posted by Jamie Kalb View Post
Hey Brandon,

How were these wheels in retrospect? Are there any changes you wish you had made, or did they perform pretty much the way you wanted? This is such a neat concept!

These wheels show a lot of promise in regards to FIRST robots. There are some definite changes I would make to the wheels in regards to geometry, but thats about it. What we are going to do over the summer is machine a block of wax into a wheel with more ideal geometry. We are then going to use that wax wheel to create a new mold. We want to produce some of those wheels from the mold and put them through some tests. If they perform like we expect they will, we want to make a multi-cavity mold. This will allow us to pop out 2-4 wheels at a time and essentially make wheels a standard item for us to design around.

Let me know if you have any more questions.


-Brando
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Unread 14-10-2010, 10:41
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Re: pic: How 125 is rolling this year...

Has anyone else tried this? Any success? Brando, what mods did you come up with for this wheel? Can I get a picture of the actual mold? I don't quite get how you get the entire wheel molded on all sides without any machining.
Thanks
Bruce
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