tmaxx bulks

[rak12]

FYI: found these on ebay, front and rear NIB 6061 ACNCM bulks for only $40. Seems almost too good to be true, hope it's not I have a set on order. I'll keep everyone posted when they arrive. Also available in polished, and fronts or rears seperately.
The way I figure they can't be any worse than the Integy on my maxx right now.... lol

http://www.ebay.com/itm/T-E-Maxx-3-...Control_Parts_Accessories&hash=item415af91597

 

[Phins Fan]

Keep us posted for sure!!! A complete set (front and rear) for $40 is an awesome (Sorry Rolex) price. The fact they are 6061 and not 7075 makes them stronger as well!

 

[rak12]

expected arrival is Thursday 2-9-12, hopefully I'll have time that night to install at least one set and check for fit and finish. I've done a little research and ACNCM make a decent product, of course that is they really are. Ebay is a gamble sometimes.

 

[rak12]

The bulks arrived today, they were packaged in a sealed bag, one pair per bag. Because of the packaging they had minor minor scratches from rubbing against one another. However, there was no header tag on the bag or other documentation indicating they were in fact ACNCM products, but the looks and finish seem to be ACNCM. Overall still a great deal for $50 shipped. I'll check fitment tonight hopefully.

 

[Snook Man]

ACNCM bulks are pretty common and can be found for even slightly less sometimes.

BTW, 6061 is not as strong as 7075 aluminum.

 

[frickenjoey]

^^ Agreed. Most people use 6061 because it is easier to mill then 7075. But either way it's FAR superior to what Integy puts out. I had those same bulks for years and they stayed solid until I swapped over to hubid bulks.

 

[rak12]

Agreed 7075 is stronger than 6061, but it's also cheaper and that is a factor during my recent overhaul. I'm putting in a .26 max red dot so in addtion to those expenses, I wanted to upgrade my Integy bulks. The Integy's have maybe 1 1/2 gals on them with no wrecks or jumps and the guide holes for the a arm pins are already beginning to wallow out creating slop(especially the fronts). Someday I do want to upgrade to FLM hybrids, but it can wait for now.

 

[rak12]

The bulks fit well. no issues at all. Because of price I was afraid maybe they were knockoffs of ACNCM, but based on fitment and feel they seem to be real. As far as those minor scratches, A little metal polish and elbow grese and they look great. I'm glad to have gotten rid of the Integy junk that was on there.

 

[frickenjoey]

They look the same as the ones I had....They got passed on to another guy and they are still going...good stuff. You made a good purchase there man.

 

[Phins Fan]

Sorry guys but I will respectfully disagree that 7075 is stronger than 6061. While I'm not a Metallurgic Technician, I have over 15 years experience in the machining and anodizing industry. Alot of shops will use 7075 as it is softer due to the extra impurities that it contains than 6061 (Higher copper, zinc,and silicates just to name a few) which make it easier to cut when milling/mfg.. These impurities will help in dissipating heat while in use but in fact make it more likely to fail due to stress deposits in the concentrated areas of these impurities. 7075 will also supply a greater substrate, once anodized, that will absorb primers and paints for a better bond to the aluminum. 6061 anodizes at a smaller pore structure therefore making it stronger yet again.

 

[frickenjoey]

Sorry buddy...6000 series are alloyed with magnesium and silicon, are easy to machine, and can be precipitation hardened, but not to the high strengths that 2000 and 7000 can reach. The 7000 (IE 7075) are alloyed with zinc, and can be precipitation hardened to the highest strengths of any aluminium alloy. Do you homework and try again.

 

[Greywolf74]

Excerpts from wikipedia:

6000 SERIES

The mechanical properties of 6061 depend greatly on the temper, or heat treatment, of the material. [1] Young's Modulus is 10x10^6 psi (69 GPa) irrespective of temper.[2]
[edit] 6061-O

Annealed 6061 (6061-O temper) has maximum tensile strength no more than 18,000 psi (125 MPa), and maximum yield strength no more than 8,000 psi (55 MPa). The material has elongation (stretch before ultimate failure) of 25-30 %.
[edit] 6061-T4

T4 temper 6061 has an ultimate tensile strength of at least 30,000 psi (207 MPa) and yield strength of at least 16,000 psi (110 MPa). It has elongation of 16%.
[edit] 6061-T6

T6 temper 6061 has an ultimate tensile strength of at least 42,000 psi (300 MPa) and yield strength of at least 35,000 psi (241 MPa). More typical values are 45,000 psi (310 MPa) and 40,000 psi (275 MPa), respectively.[3] In thicknesses of 0.250 inch (6.35 mm) or less, it has elongation of 8% or more; in thicker sections, it has elongation of 10%. T651 temper has similar mechanical properties. The famous Pioneer plaque was made of this particular alloy. The typical value for thermal conductivity for 6061-T6 at 80°C is around 152 W/m K. A material data sheet [4] defines the fatigue limit under cyclic load as 14,000 psi (100 MPa).




7000 SERIES


The mechanical properties of 7075 depend greatly on the temper of the material. [2]
[edit] 7075-O
Un-heat-treated 7075 (7075-O temper) has maximum tensile strength no more than 40,000 psi (276 MPa), and maximum yield strength no more than 21,000 psi (145 MPa). The material has elongation (stretch before ultimate failure) of 9-10%.
[edit] 7075-T6
7075 tech sheet T6 temper 7075 has an ultimate tensile strength of 74 - 78,000 psi (510 - 538 MPa) and yield strength of at least 63 - 69,000 psi (434-476 MPa). It has failure elongation of 5-8%.
[edit] 7075-T651
T651 temper 7075 has an ultimate tensile strength of at least 67 - 78,000 psi (462 - 538 MPa) and yield strength of 54 - 67,000 psi (372-462 MPa). It has failure elongation of 3-9%.
The 51 suffix has no bearing on the heat treatment but denotes that the material is stress relieved by controlled stretching.


According to this untempered 7075 is almost as strong as the best 6061.....Unless I'm missing something here which anyone can feel free to point out because I am definatly not an expert I'm just assuming whoever did the wikipedia write ups is

 

[Snook Man]

Sorry guys but I will respectfully disagree that 7075 is stronger than 6061.

I think you are confusing the two alloys…
Both 6061 and 7075 T6 are relatively easy to machine (with sharp tooling both cut like butter, and at proper speeds/feed rates little heat is generated), the machining cost really does not play a part in the cost of the part being machined between either of the two alloys. Billet T6 7075 cost approx 2 to 3 times that of T6 6061.

Below are a few more figures for you to look at.
Everything we want in an aluminum RC part, Strength, rigidity, tensile strength etc is better suited with T6 7075 except for the price.

T6 7075
http://www.makeitfrom.com/material-data/?for=7075-T6-Aluminum

T6 6061
http://www.makeitfrom.com/material-data/?for=6061-T6-Aluminum

I will let you draw your own conclusions, but having worked quite a bit with both materials in making custom rc parts I know which I prefer and which performs the best for me and many others.

From this…

Comes this…

 

[2revo1maxx]

7075 is much stronger, hands down. In something beefy like a bulkhead I'd think that the only problem with 6061 is stripping screw holes. Anything else should be 7075.
Looking good there Snook man. When's the moment we've all been waiting for?

---------- Post added at 12:50 PM ---------- Previous post was at 12:49 PM ----------

Op go to fastlane machine if you want some nice bulks.

 

[Snook Man]

When's the moment we've all been waiting for?

Probably late spring or early summer. I’m at a stand still waiting on the XO-1 wheels and tires to become readily available to finalize a few measurements. Except for small details I’m twitting my thumbs atm.