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Old 07-21-2011, 01:42 PM   #1
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Default 7075 aluminum vs delrin

Does anybody have a weight comparison of 7075 aluminum to delving thanks

Last edited by LUNAticCrawlingCrew; 07-21-2011 at 03:45 PM.
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Old 07-21-2011, 02:02 PM   #2
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7075 2810 kg/m3

delrin 1420 kg/m3

almost exactly half
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Old 07-21-2011, 02:57 PM   #3
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Of course 7075 aluminum is much stronger than delrin.

The tensile strength of 7075 is at least 55000 psi depending on temper and what not. Delrin has a 9000 psi tensile strength.
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Old 07-21-2011, 03:25 PM   #4
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it is heavier, though you can use thinner material with the 7075 as compared to delrin for links, tie rods, etc
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Old 07-21-2011, 03:51 PM   #5
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thanks i was thinking about making a moonbuggy chassis out of aluminum if mine ever breaks so i was thinking i would use 7075 and ill just make it thinner
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Old 07-21-2011, 03:52 PM   #6
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Quote:
Originally Posted by Erin View Post
it is heavier, though you can use thinner material with the 7075 as compared to delrin for links, tie rods, etc

Think about RPM arms vs. alluminum for links. There's some give and take when yer talkin about high Speed bashin.
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Old 07-21-2011, 07:26 PM   #7
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Quote:
Originally Posted by LUNAticCrawlingCrew View Post
thanks i was thinking about making a moonbuggy chassis out of aluminum if mine ever breaks so i was thinking i would use 7075 and ill just make it thinner
I built my chassis out of an unknown alloy aluminum scrap I had laying around. The problem I have is when it takes a big tumble, like multiple cartwheel type tumble, the chassis can become deformed. I'm wondering if Delrin is much more resilient in this way that it would just absorb some of the impact and return to it's intended shape after a tumble? Or do I just need to design my chassis better so it won't bend in a tumble?
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Old 07-21-2011, 08:12 PM   #8
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Originally Posted by gm0688 View Post
Think about RPM arms vs. alluminum for links. There's some give and take when yer talkin about high Speed bashin.
Absolutely, i have never run aluminum on go fasts. But crawlers are a whole nuther animal. I prefer alluminum for upper links and tie rods. Delrin for lowers because its so slick.
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Old 07-21-2011, 08:57 PM   #9
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Originally Posted by static80 View Post
I built my chassis out of an unknown alloy aluminum scrap I had laying around. The problem I have is when it takes a big tumble, like multiple cartwheel type tumble, the chassis can become deformed. I'm wondering if Delrin is much more resilient in this way that it would just absorb some of the impact and return to it's intended shape after a tumble? Or do I just need to design my chassis better so it won't bend in a tumble?
7075 aluminum is many times stronger than the low grade kind found at most hardware stores and can hold up to tumbles and falls just fine.

If you are going to weld it you need 6061 though as 7075 does not weld well at all.

DMG does a lot of work with aluminum tube chassis and has had great success with them. Many people here run aluminum DMG tube chassis and a really nice bonus is that they are extremely light compared to steel.

Aluminum us great for go fast rigs it just needs to be high quality machined parts from 6061 or 7075. Not the cast garbage most manufacturers sell. I beat the snot out of my 7075 stampede breaking well over 70 mph and not bending anything.
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