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Old 06-11-2006, 09:33 AM   #361
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Quote:
Originally Posted by anthony390
oh sorry that was a careless typo

so what are the pros and cons between the delrin and graphite
delrin is machineable

graphite is strong



basically
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Old 06-11-2006, 02:04 PM   #362
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Anybody,

Seen new photos of the car from tha Nats?


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Old 06-11-2006, 05:30 PM   #363
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[QUOTE=

so what are the pros and cons between the delrin and graphite[/QUOTE]

machined parts are expensive and time consuming to make, moulded plastic or graphite parts are much cheaper and easier to manufacture. Corrally had a car, I think the assasin that had delrin arms and the price of replacments was something like $80 a set here in AUS.
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Old 06-11-2006, 07:39 PM   #364
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For this application, specifically R/C car suspension arms, the carbon material we use is superior to Delrin. However, it's only available in injection molding form whereas Delrin can be bought in billets which can then be machined. So for prototype purposes, we just have to settle for delrin and tell our drivers to please not crash.
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Old 06-11-2006, 11:23 PM   #365
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Quote:
Originally Posted by 414play
machined parts are expensive and time consuming to make, moulded plastic or graphite parts are much cheaper and easier to manufacture. Corrally had a car, I think the assasin that had delrin arms and the price of replacments was something like $80 a set here in AUS.
Injection molded parts are quite inexpensive, but go out and pay what it costs to have an injection mold made. VERY EXPENSIVE!! Bottom line, machined parts (delrin, alum, carbon, etc) are more cost effective for smaller runs. Injection molding only works for very large runs of the same part when you can spread the cost of the mold over 1000's of parts.

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Old 06-12-2006, 01:30 AM   #366
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Quote:
Originally Posted by T. Deguzman
For this application, specifically R/C car suspension arms, the carbon material we use is superior to Delrin. However, it's only available in injection molding form whereas Delrin can be bought in billets which can then be machined. So for prototype purposes, we just have to settle for delrin and tell our drivers to please not crash.
This topic about delrin is a bit confusing...

I replaced my outdrives from the stock graphite plastic to delrin. Because they say that delrin is much tougher than the graphite plastic, and yes, more expensive. So, which is a better material for outdrives and why?

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Old 06-12-2006, 03:09 AM   #367
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from post 354, looks like they are staying with the very easily adjustable sway bar mounts as per the TC4. Thats one part i hate playing with on a conventional sway bar setup.
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Old 06-12-2006, 03:51 AM   #368
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Tough, Strong, and Stiff mean different things. One material may be strong (high tensile strength) but not necessarily tough (high impact resistance). Delrin is a little bit tougher than the suspension arm material but it's not as stiff. And I'm sure you already know them importance of stiffness when it comes to suspension. Yes, impact resistance is also important in suspension arms but you don't want to sacrifice too much of the other properties just to get toughness. For example, the material used on body posts are about as tough as plastics get, however, it has a very low stiffness so you wouldn't want to use that material on arms. Designers have to juggle these properties to select the appropriate material for the desired application.

There are a ton of other properties that must be considered in addition to the three I mentioned. There's chemical resistance, machinability, moldability, cost, optical qualities, density (weight), friction, and so on and so forth. Some work well in high temperatures, others work better in freezing temperatures. That's why you'll notice that diffs, arms, arm mounts, body posts, fuel tanks, shock pistons, bodies, ball cups, and gears all use different materials. They haven't invented a super plastic material that excel in all areas. Well, maybe they have but surely it's expensive as hell.
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Old 06-12-2006, 11:48 AM   #369
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Quote:
Originally Posted by Kevin Boyle
Anybody,

Seen new photos of the car from tha Nats?


Kevin Boyle
yes..how's this shot:
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Old 06-12-2006, 12:33 PM   #370
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that's funny.
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Old 06-12-2006, 12:36 PM   #371
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Delrin: http://en.wikipedia.org/wiki/Delrin
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Old 06-12-2006, 12:50 PM   #372
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Quote:
Originally Posted by rc-zombies
yes..how's this shot:
I want the real picture!!
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Old 06-12-2006, 01:00 PM   #373
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Quote:
Originally Posted by KarpetRacer93
I want the real picture!!
it's Baker's car...he might break his other hand if I show it...
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Old 06-12-2006, 01:07 PM   #374
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Default Why not just show your pic of it?

What's the big deal if people are already seeing it at the races. If it's that important they should leave it at home.
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Old 06-12-2006, 01:07 PM   #375
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Anyone hear anything on when we might see this hit the stores? Is this 1 year out, more? less? Any idea?

I know whatever date we get will be tentative but it would be nice to know where they are withing the lifecycle of design.
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