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Old November 6th, 2012, 08:02 PM   #21
cerial
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Originally Posted by Muttly View Post
Why would you drive a buggy on the highway for hours?
Think of it as a unlimited class 1 buggy.

This was never designed to be a crawler. It only has like a 60/1 craw for general playing around. It is designed to go stupid fast over rough terrain.
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Old November 7th, 2012, 09:10 AM   #22
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Think of it as a unlimited class 1 buggy.

This was never designed to be a crawler. It only has like a 60/1 craw for general playing around. It is designed to go stupid fast over rough terrain.
What is the drivetrain again, then, for this stupid-fast thing?

Go fast vehicles don't drive fast at 1500 rpm.

Go fast vehicles don't use SM465s.

Last edited by Haggar; November 7th, 2012 at 09:15 AM.
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Old November 7th, 2012, 09:38 AM   #23
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If your gearset looks like the ones in the drawing, I would think you would have some monsterous shear pressures at the corner of the tooth that is squared off.
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Old November 7th, 2012, 10:15 AM   #24
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So you expected to spend about seven thousand on this fucking overdrive? What the fukc ! How would you ever recoupe that loss? Certainly not in fuel savings. So you not only have to make everything as difficult as possible, you wanna spend a shit ton of money to do it? You may actually be retarded.
I think I am retarded also then.I have often wasted money building something that had no chance of paying for itself,or did it? It's more about what you enjoy doing and what you learn then about wasting or recouping money.
College courses are exspensive and boring,hands on is exspensive and fun.I just consider the 7g a tuition payment.
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Old November 7th, 2012, 10:39 AM   #25
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If your gearset looks like the ones in the drawing, I would think you would have some monsterous shear pressures at the corner of the tooth that is squared off.
That is a standard involute tooth profile. Nothing wrong with it at all.
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Old November 7th, 2012, 10:54 AM   #26
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I like your idea.
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Old November 7th, 2012, 11:43 AM   #27
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I think I am retarded also then.I have often wasted money building something that had no chance of paying for itself,or did it? It's more about what you enjoy doing and what you learn then about wasting or recouping money.
College courses are exspensive and boring,hands on is exspensive and fun.I just consider the 7g a tuition payment.
I get that....sort of. I make everything I can but at some point you gotta buy something ready made too. 7k is an awful lot for a fucking part of a tranny. You could build a whole rig for that. Or invest it and buy a new truck twenty years from now. But whatever, it's his pipe dream.
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Old November 7th, 2012, 11:49 AM   #28
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LOLing at trying to perfect gear design over the internet. Gear Design is pretty Fing cloce to rocket science, and I'm not kidding.
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Old November 7th, 2012, 12:35 PM   #29
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LOLing at trying to perfect gear design over the internet. Gear Design is pretty Fing cloce to rocket science, and I'm not kidding.
Yes and no. There are standard formulas out there that have worked for years and years in special machine reducers, drive reductions, pinion stands, etc. The difference I see in automotive is a couple things.
Noise reduction.
High speeds. (most gearboxes don't see anything over 1800 rpm)
Mass production costs/savings.
Optimizing material types, heat treat process, etc for costs.

But if you want to produce a one-off reduction gearbox, it's not rocket science. It's just silly.
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Old November 7th, 2012, 12:47 PM   #30
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I need some freaking help cause I seem to have pitting issues no matter how I figure this.

Not sure where this should be placed so I am placing it in general.

Totally within torque, temperature, and bearing limits giving a long lasting (noisy) drive train.


Here are the numbers I am looking at, the issue is in red.









Any help is greatly appreciated. Any flaming is totally understandable given my regrettable previous threads.

I just emailed this to my indian friend. I'll see if he replies.
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Old November 7th, 2012, 12:47 PM   #31
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Originally Posted by Tab View Post
I get that....sort of. I make everything I can but at some point you gotta buy something ready made too. 7k is an awful lot for a fucking part of a tranny. You could build a whole rig for that. Or invest it and buy a new truck twenty years from now. But whatever, it's his pipe dream.
I wanted a transfer case that I could not break. The overdrive ratio is to reduce stress at the pinion. I looked at atlas and others finding people breaking them. This has very few parts making it reliable compared to others.

The 465 is cheap to run and rebuild same reason why I choose a sbc.It also mates to many diffrent engines without a adapter. The brown lipe is out of a gravel truck so it is more then up to what I have planned. Yes the 465 will take longer between shifts but if you look at the ratios I only need 2 shifts running high rpm or 3 shifts with lower rpm.

I am building this because I have never done a complete ground up build. One of those bucket list things. I could buy a done one at like half the cost but then it would be someone elses ride. If I just wanted something to bash against trees I would buy another BB 77 highboy and run it until it does not move kind of thing.
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Old November 7th, 2012, 01:49 PM   #32
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Fair enough. Good luck.
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Old November 7th, 2012, 02:19 PM   #33
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Originally Posted by cerial View Post
I wanted a transfer case that I could not break. The overdrive ratio is to reduce stress at the pinion. .
Overdrive usually means higher stress on pinion gear.

I just feel bad for you. You clearly want to make this thing. Stop thinking, and make it. THEN if you break, fix it. But your theorys/obsession with insanely low RPMs make no sense.

Yeah, if you read on the internet, people break stuff. They break everything. When you put 600HP and 54" boggers and try to put on a show doing full throttle hill climbs, you will break.

Homemade gears and hundreds of pounds of unnecessary weight will not make your rig any more reliable.
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Old November 7th, 2012, 04:32 PM   #34
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Originally Posted by whiterhino View Post
That is a standard involute tooth profile. Nothing wrong with it at all.
Ok, just my (unqualified) opinion. I can see where the tooth closest to the center lines of the gears would have the highest shear.
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