STIFFY chassis assembly... final cut!

[zeropointbug]

Hey, im just posting a link to my new Web Album with Picasa2. Thanks Serum ;)

Only 2 pics on it so far though...

[BrianG]

Umm, did you forget the link? ;)

[zeropointbug]

LOL

YES I DID!!! haha

thanks Brian

here's the link : web photos

[Serum]

Hulsebosch?

that's one Dutch name boy..

[zeropointbug]

BTW, has anyone heard of the Titanium alloy 62S? I am reading around the web that it's a low cost Ti alloy, although i don't know the price yet, haven't found a supplier of it yet.

Anyways, it has medium-high strength for Ti alloys @ 140,000 psi Yield strength (MATWEB), and 145,000 ultimate. It's 60% more dense than Alum. though, but twice as strong, and much tougher for impact strength.

Sounds like a good alternative to 7075 @ 73,000 psi (MATWEB). I've seen some Ti alloys up to 280,000 psi. wow

If the price is right...

[Serum]

Machining it will be more expensive.

All titanium costs significant more than aluminum. 7075 is the poor mans titanium.. :p

[zeropointbug]

or the rich man's aluminum... :005:

true, I'll see how much it costs, then I'll inquire about it to my machinist.

It's about 25% stronger for the weight, but again, it would be much tougher, as it would flex alot more, and surface hardness.

[JThiessen]

You dont want to be messing with titanium. The cost in material is only slightly higher (in the quantities you are looking at), but the cost of the machining and bits will be significantly higher. Not enough gained to recover the cost and time.

As was stated before, ultimate strength of AL alloys does nothing for you. You want bending strength, yeild point, and life cycle info if you are getting that in depth. IMHO, just go with 7075 and dont look back. But you still wont go wrong with 6061-T6

[zeropointbug]

LoL, my machinist told me that titanium eats flutes (bits) like it were a pencil sharpener, haha.

Yes, i know nothing matters but Yield strength, and modulus strength. Iw ould have only made the bottom chassis out of titanium anyways, it would be pointless for the braces, as aluminum would prob even be suited better for that part, as it is just more bulky. That's where alum. wins, is for bulkiness (for a given mass), which makes for a rigid part, whatever that may be.

thanks for the comments.

Zero

[Serum]

I do like the design in general; the lower plate looks good IMO. It will be hard to hold the cells in place on a flat plate though.

The braces are too thick, and i would try to do my best to make it not look like a g-maxx. If you add a servo mount to the front plate it becomes more and more a g-maxx.

Another thing about designing, is to make something that is fair easy to machine. Laser cutting would surely bring the costs down. Not as nice, but with the right design you can get away with it.

The part where the two braces come together behind the motor is too chunky IMO.

Making your own drive shafts isn't something i wouldn't do. Use widely available parts, that's a sport, to keep the costs down. (it's a challenge to design around existing parts) it's more of a basher chassis with the rigid centershaft; but if it's a basher,it is a basher with not too much ground clearance. And if you make it so it fits a stock maxx tranny/slipperential it becomes (like you suggested yourself) even more of a g-maxx chassis. (with an integrated motormount.)

[zeropointbug]

Thanks Serum

The more and more I think about making it better, the more I think it's not really worth it (the effort, and cost). About the shaft, the thing about that too, I can only gear it down to go roughly 42mhp MINIMUM. That's using 12T pinion :026:

I'll think about whether I want to go ahead with this thing, if not, mah, at least I learned how to use 3D CAD.

BTW, Gorillamaxx is coming out with new updated parts. Do have any idea what features might be new? If any.

Zero

[Serum]

Check the thread about it, it's all there.

[zeropointbug]

Well, I'm going to revise the chassis to accept a tranny/slipperential instead, then go from there.

The main difference between it and a Gmaxx chassis then, is that this would be 7075 alum., and better chassis braces.