Still interested also, depending on pricing.
I'm trying to keep 3 transmissions built the same.
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Still interested also, depending on pricing.
I'm trying to keep 3 transmissions built the same.
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I should hopefully know a price here soon. I'm hoping they are $800 range per drum, both drums have to be used since we are using the 904 friction.
Are the drums steel, or aluminum? You guys track test them first; If they don't explode I'm in. and so would be many other racers. Not in any way trying to be a smart a$$. I'm just cautious.
Rob- I currently do not have any gears laying around, my ring and pinion cannot be used with stock transfer gears. So you would have get the transfer gears with ring and pinion. Could you possibly get 3 people interested in a set and I can get a quote. I may even get an extra set.
Warren-the plan is aluminum for both drums, my only concern is with the forward drum is the input shaft splines. But the 7075 material is stronger than the shitty oem material. I have 100% confidence that the drums will not explode, I’ve already ran one of Brian’s aluminum drums for high gear and they use the same drums in the 904. But I do plan to test them before going forward with the rest of the drums. Once I get the test pieces, going to fit everything and then run the car and report back.
7050 Al has the same basic strength as mild steel, which is why it's use in proper AN fittings and as the proper material for AR upper and lower receivers.
It doesn't anodize as nicely (at least not without expensive prep), which is why so many use "aircraft" 6061, which is a bit misleading, it's not a material to be used in a highly stressed area of any aircraft...
All that to say, "good choice of material". It's a good compromise between ultimate strength and cost (better material isn't going to gain much, but the cost sure would!)
Mike
Thanks for that Mike.
I'm anxious to see how this turns out.
Not anxious to have to come up with funds for 3 transmissions worth of parts!
If we miss out on the initial offering of these, how many units would be needed for another batch?
Already thinking too far ahead, sorry!
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The thing you're paying for with true aerospace quality materials is the certifications (the stack of papers) saying that the raw materials and methods used to make the end product are approved to be used on an aircraft. There are *NO* inherent advantages to paying more for "aerospace grade" unless you absolutely *need* it.
I would figure a tougher material with a high surface hardening would be preferred. A 6000 or 7000 series (as has been chosen) with a T6 hardening and maybe a DLC coating on the splines.
Just to be clear, the certifications that trace the manufacturing process (from ore, to the heat the material was made from), don't have a bearing on the actual grade of the material (7075 vs 6061, etc), the chemistry, heat treat, etc. are what determine the grade.
For some industries, aerospace being one, often a requirement will be that the material used be from a US source, which the cert will document, as well as ensure the material actually IS what it is supposed to be.
Mike
Already been in for ring/pinion/transfers but been all silence after I was informed the Drums were going forward.
I saw today that DSM guys have a serious planetary problem (slow high torque cars can kill them) but they also run mid 7's inconsistently. They currently have no fix. I find it awesome to get any good parts for our transmissions, or see we might have more potential than another transmission.
Zin- yea clearly when comparing 7075 aluminum to a better alloy steel the steel is going to win. But I’m comparing to the oem cast steel drums. Comparing the tensile strength of cast steel to the 7075, the 7075 should hold up just fine. We would save money actually going to say 4041 steel the aluminum is more $$$
I agree, 7075 is a good choice, and since the part is restricted in its dimensions so as to fit in the same place, a stronger, yet lighter material is a great choice.
More strength, less rotational mass, a win-win. As for the steel option, sure, it's going to be stronger, but it would also be heavier, and is that added strength even a benefit at this point, other parts will likely prove to be the "weak link in the chain" before this piece.
So, I concur with the choice of materials.
Mike
After test fitting and testing the drums, I’m going to look into hard coating the pieces. Once these are done, I’m hoping to have the upgraded sprag batch done using 12 rollers instead of 8. Next thing would be straight cut planets.
I’ve been half tempted to just swap full dsm drivetrain in. But it’s still going to need developed some.
Well the hosting site I normally use is down. Anyone suggest a site? I have picture of the billet forward drum in my hands finally
Posting for boots:
https://uploads.tapatalk-cdn.com/201...8fb487c7cf.jpghttps://uploads.tapatalk-cdn.com/201...8c812d86fb.jpg
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That is SEXAH!!!
Are they going to be hard anodized for added durability?...
Mike