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 Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]

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muckmudd
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 12:45 am

I'm thinking
0* toe
0* camber
10* positive caster?
What do you guys think?
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AllisKidD21
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 12:48 am

That sounds about right! There should maybe be some KPI to help with weight transfer when turning at high speed.

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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 12:49 am

I think you'll want a degree or two of negative camber. Don't go full ricer, but widen out the base just a hair
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 12:50 am

So have the king pin tilted but have the camber be at 0*
KPI is like scrub radius or something like that right?
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 12:52 am

I assume by "scrub radius" you mean ackerman angle? Where the inside tire turns just a little bit sharper so it can make that tighter turn?
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 12:52 am

Haha CQ. You know I even considered it for a minute just for the stance and look but I still want it to steer properly. You think a few negative degrees would help?
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 12:54 am

I thought ackerman angle was where you put the tie rod tabs according to the length of the frame and that triangle you make with the king pin and the middle of the back of the frame?
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 12:55 am

KPI stands for King Pin Inclination, it's basically the angle of the king pin off the spindle when looking from the front of the axle.




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Success doesn't happen to all of us, if it did they'd change it believe me - Red Green

                             Tourque it 'til it breaks, then back it off a quarter turn!
       

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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 12:56 am

I think just a degree or two, and maybe one degree of toe in. I think that helps it track straight. nothing crazy or you'll just wear out tires, but I think a degree or two is good

Yes, that triangle between the spindles and the center of the rear axle is ackerman angle
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 12:59 am

Well that degree of toe in is always adjustable at the end with the tie rods so i'm just gonna forget about it until I get there.
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 7:33 am

@muckmudd The direct steering in that first video that you liked seems like a good setup for speed so it should fit this rig. Imagine that the steering shaft is kinda like an axle, it will need a bushing or bearing at the top and bottom, and some means to keep the shaft from moving up or down, this is usually some kind of shaft collar. I used to believe in eye-balling a little toe in until I actually aligned my tractors with zero toe in or out and they handle so much better now. KPI helps the wheels return to the straight ahead position while driving. My Wheel Horses have a lot of KPI and I have definitely experienced this phenomenon. It helps the wheels come back to straight when exiting a turn.
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 11:22 am

Yeah. What's a good amount of KPI? I will have to go fins some bearings and start working on the front end pretty soon I guess since I don't have much else to do before I can get proper pulleys, my chain in the mail and work out some drive train stuff.
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 11:59 am

i’m getting close to building my front axle for mud rat so I will measure the KPI on the wheel horse spindles that I’m going to use for it.
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 4:38 pm

8*-10* KPI is good to use. It's what I have on Mutt. I added like 2* of positive camber too while I was at it, but you don't have to do that. I think I added 10* (ish) of positive caster too, it's helped a good bit.
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 6:43 pm

I just measured the Wheel Horse KPI... it was 9 degrees right in between 8 and 10.
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 7:06 pm

Ok I will add some KPI as well guys. It should keep it on track. I'ts not gonna be the most accurate though I can tell you because its proably just gonna be somewhat eyeballed lol. I'll try my best to make them the same on both sides at least.
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 9:03 pm

you don't have a protractor laying around?
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 9:47 pm

Yeah but i'm sure not going to be whipping out the dial indicator and the digital micrometer haha.
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Thu Apr 05, 2018 11:34 pm

You can get close enough with a protractor. Don't have to go into trigonometry with it lol.
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PostSubject: Re: Muckmudd's 2018 Build off "Astro Rat" [2018 Build-Off Entry]   Fri Apr 06, 2018 12:30 am

Ok then we're good!
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