"BJohnson11" (brettjohnson01)
12/29/2014 at 20:24 • Filed to: None
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"BJohnson11" (brettjohnson01)
12/29/2014 at 20:24 • Filed to: None | 4
| 13 |
Got the sprocket carrier for the Formula car all done. Didn't take too long, and seeing as I had already machined almost the same exact part for the Formula Electric team, it wasn't a headache. Only nerve wracking part was that the pre-broached hunk of 7075 billet aluminum cost around $250, so messing up wasn't much of an option.
RallyWrench
> BJohnson11
12/29/2014 at 20:45 |
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Beautiful work. How much does it weigh?
Captain of the Enterprise
> BJohnson11
12/29/2014 at 20:45 |
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Nice drexler we use those too
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BJohnson11
> RallyWrench
12/29/2014 at 20:49 |
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Probably under half a pound.
gogmorgo - rowing gears in a Grand Cherokee
> RallyWrench
12/29/2014 at 21:17 |
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Too much!
Coming from my FSAE experience, everything always weighs too much. Especially spinning things. An independent diff is likely sprung, though, so it's not the absolute worst kind of mass – the rotating unsprung kind – but it's up there.
uofime
> BJohnson11
12/29/2014 at 22:52 |
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how much is the complete assembly with the gears inside?
Chuck 2(O=[][]=O)2
> BJohnson11
12/29/2014 at 23:31 |
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Seriously??? that thing looks like it weights 5.
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BJohnson11
> Chuck 2(O=[][]=O)2
12/29/2014 at 23:58 |
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Oh. Just the sprocket carrier alone is under a half pound. The differential is close to 5 pounds.
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BJohnson11
> uofime
12/29/2014 at 23:59 |
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The Drexler diff is around 5 pounds, plus the weight of the carrier.
orcim
> BJohnson11
12/30/2014 at 02:29 |
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Ya know what makes that porn for me? I don't even know what it is. I have a yearning to know, but it's also exciting that I don't know what it is. Machines - precision - function (even if I don't know what that is.) Love it.
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uofime
> BJohnson11
12/30/2014 at 10:05 |
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Don't forget the tripods or the bearings for the carrier! all the details really add up
Redbulldidlo
> BJohnson11
12/30/2014 at 10:22 |
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This is really, really cool, but the more interesting thing to me is what level of 'formula' racing is this for?
You can tell a Finn but you can't tell him much
> BJohnson11
12/30/2014 at 11:28 |
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Are these "sealed" by rules, or why are there only paint marks on one set of screws? This bothers me because a lot of places will put paint to indicate the screws have been tightened and I can't help but wonder if all the rest have been properly torqued or if only one set per side has been torqued.
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BJohnson11
> You can tell a Finn but you can't tell him much
12/30/2014 at 22:18 |
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Not sealed by rules, but yes I agree that does bother me. I'm used to having bolts all be torque-striped when they're torqued down. I'd guess they marked the bolt they tightened first then went and tightened around in a circle and that's how they know they tightened them all? Idk.