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MattTavares
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PostSubject: New Materials?   Wed Apr 29, 2009 11:05 pm

We all know about 2024, 6061, and 7075 aluminum, Grade 5 titanium, S7 tool Steel, etc.
Has anyone stumbled upon some other grade of material they think is worth looking at for one reason or another on the robots. If we find some really promising grades I can order some and test it with my research budget then report my findings back here. Otherwise my research budget is just going to go away at the beginning of next year.
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PostSubject: Re: New Materials?   Wed Apr 29, 2009 11:10 pm

try heat treating 4130? or explore the wonders of 4340? both chromoly steels...
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MattTavares
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PostSubject: Re: New Materials?   Wed Apr 29, 2009 11:15 pm

yeah. I havn't used those but I know some other teams that have.
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PostSubject: Re: New Materials?   Wed Apr 29, 2009 11:47 pm

we used annealed 4130 for copperhead's frame... it worked great but we were considering heat-treating it, so I'm curious as to how that would have worked. The teeth on Eddie's (Quasar) shell were 4340, which he claims is harder than Ti...

If I think of anything else, I'll let you know.
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MikeNCR
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PostSubject: Re: New Materials?   Thu Apr 30, 2009 1:14 am

Interstellar Overdrive used heat treated (45hrc) 4130 for the front wedge and my new 30lber is using some garolite in a somewhat non-structural portion of the chassis
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MattTavares
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PostSubject: Re: New Materials?   Thu Apr 30, 2009 12:47 pm

what is garolite?
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MattTavares
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PostSubject: Re: New Materials?   Thu Apr 30, 2009 12:47 pm

Also I remember reading somewhere that one team was using masonite because (they claim) it has the same strength and density as aluminum but flexes less.
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PostSubject: Re: New Materials?   Thu Apr 30, 2009 5:07 pm

garolite is a non metal that comes close in tenslile and impact strength to aluminum(according to mcmaster catalog) BUT I DO NOT SUGGEST UNLESS YOU HAVE A FAIRLY LARGE BUDGET THE STUFF IS EXPENSIVE AS HELL
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MattTavares
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PostSubject: Re: New Materials?   Thu Apr 30, 2009 6:23 pm

probebly an acetal base like delrin
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MattTavares
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PostSubject: Re: New Materials?   Wed May 06, 2009 1:33 pm

Alex Udanis wrote:
MattTavares wrote:
We all know about 2024, 6061, and 7075 aluminum, Grade 5 titanium, S7 tool Steel, etc.
Has anyone stumbled upon some other grade of material they think is worth looking at for one reason or another on the robots. If we find some really promising grades I can order some and test it with my research budget then report my findings back here. Otherwise my research budget is just going to go away at the beginning of next year.

We've used 17-4ph stainless steel in the past with great success.

That is a new one to me. Ive always stuck with 404 for the really strong parts and 303 for stuff that I need made in a hurry (its easier to machine). Im going to have to check this stuff out.
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Cody
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PostSubject: Re: New Materials?   Wed May 06, 2009 4:52 pm

I think we used it for the weapon plate on original shockwave, if im not mistaken.
The guy who now does or zirconium finish is an amazing metallurgist and has contracts with the dep. of defense and GMC and the such, he turned us onto it
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PostSubject: Re: New Materials?   Wed May 06, 2009 4:56 pm

Cody Harris wrote:
I think we used it for the weapon plate on original shockwave, if im not mistaken.
The guy who now does or zirconium finish is an amazing metallurgist and has contracts with the dep. of defense and GMC and the such, he turned us onto it

Other than making your robot sound like it is from outer space, what other advantages does a zirconium finish give you?
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Cody
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PostSubject: Re: New Materials?   Wed May 06, 2009 4:59 pm

Really the only downside to it is its brittleness, biggest advantage, its Rockwell hardness isnt measurable
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PostSubject: Re: New Materials?   Wed May 06, 2009 5:03 pm

A cheaper alternative to the zirconium could be an industrial chrome plating - it may eliminate the brittleness problem for only a slight trade-off on the hardness.
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PostSubject: Re: New Materials?   Wed May 06, 2009 5:05 pm

hmm i never actually thought about that
My dad just got a pair of american racing torque thrust wheels for his car and they have an electroplated chrome finish on them that is said to never chip or flake
I think they coat the wheel in copper first and magnitize it though
I wonder what the hardness of it would be?
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PostSubject: Re: New Materials?   Wed May 06, 2009 5:09 pm

Industrial chrome plating is a bit harder than the shiny polished stuff - Mohs hardness of about 8.5. I think the main difference between ornamental & industrial coatings though is thickness.
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PostSubject: Re: New Materials?   Wed May 06, 2009 5:13 pm

i like our black bots tho hahaha
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PostSubject: Re: New Materials?   Thu Oct 15, 2009 2:09 am

jeeves_m_d wrote:
garolite is a non metal that comes close in tenslile and impact strength to aluminum(according to mcmaster catalog) BUT I DO NOT SUGGEST UNLESS YOU HAVE A FAIRLY LARGE BUDGET THE STUFF IS EXPENSIVE AS HELL

1. Garolite is cheap as hell.

2. Think of it as the poor man's carbon fiber. It's rigid and light. Commonly used in sublight (mainly insect) baseplates.

3. Unlike carbon fiber, radio waves go straight through garolite.

4. Garolite is basically circut board material. It's glass or paper fiber in resin. It also comes in funky colors from mcmaster.
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PostSubject: Re: New Materials?   Thu Oct 15, 2009 2:12 am

Dan Curhan wrote:
we used annealed 4130 for copperhead's frame... it worked great but we were considering heat-treating it, so I'm curious as to how that would have worked. The teeth on Eddie's (Quasar) shell were 4340, which he claims is harder than Ti...

If I think of anything else, I'll let you know.

Annealed 4130 is just expensive mild steel. Seriously.

4130 is a material that is just dying to be heat treated.

4340 teeth? Most places only stock 4340 rounds. You can heat treat steel to be way harder than 6AL-4V but it will just be really brittle.
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PostSubject: Re: New Materials?   Thu Oct 15, 2009 2:23 am

MattTavares wrote:
We all know about 2024, 6061, and 7075 aluminum, Grade 5 titanium, S7 tool Steel, etc.
Has anyone stumbled upon some other grade of material they think is worth looking at for one reason or another on the robots. If we find some really promising grades I can order some and test it with my research budget then report my findings back here. Otherwise my research budget is just going to go away at the beginning of next year.

Other cool materials that are uncommon here are:

AR400 (farm steel) sounds cheesy I know. I've never used it but I've heard and seen awesome things. Like TPC using it here on pipe wench. The plow is thin but holds up really well. Shock mounting plus that Abrasion Resistant steel (AR400).

Hardox is another steel alloy that's common in british bot's.

Suprised that nobody's mentioned UHMW.

Composite armor, ie uhmw or 6061 plated with some thin spring steel or something. Light structure that can absorb blows covered by a hard surface that it "bite" resistant.

Magnesium also comes up when people start talking about interesting materials but its just too expensive and 2024 and 7075 (in the proper tempered states) are just better.
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Will Bales
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PostSubject: Re: New Materials?   Thu Oct 15, 2009 7:52 am

as far as composites go, we used a sandwich of spring steel, rubber, and 6061 to armor one of our robots.
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PostSubject: Re: New Materials?   Thu Oct 15, 2009 10:53 am

Woops forgot highspeed video. Terminal velocity vs Pipe Wench with a 1/8 or 3/16" AR400 plow.

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PostSubject: Re: New Materials?   Thu Oct 15, 2009 7:10 pm

will bales wrote:
as far as composites go, we used a sandwich of spring steel, rubber, and 6061 to armor one of our robots.

Word.
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PostSubject: Re: New Materials?   Thu Oct 15, 2009 11:05 pm

don't forget, Sean.. It was my idea.

How's gulliver's robotics program coming along? Smile
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PostSubject: Re: New Materials?   Thu Oct 15, 2009 11:24 pm

my $.02 i always thought garolite was cheaper then CF but heavier
UHMW is great for insect bots even for use in 15lb class
Magnesium while being lighter then Al is much more brittle and can ignite and mush more expensive
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