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  1. Replies
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    I certainly would not call our car light. Not...

    I certainly would not call our car light. Not only is it our first car (ever), it is fully electric with very heavy batteries. I can't give you a number because it isn't built, but we are certainly...
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    Thanks Jim, Can you share your treatment...

    Thanks Jim,

    Can you share your treatment process? Temp (color), torch, time held at temp, cooling methods etc?

    Thanks,
    Josh
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    Normalizes 4130 Frame?

    Hi all,

    I'm Josh, from Boston University Racing.

    How many of you treat your frame after welding?

    We are using 4130 ChroMoly with ER70-S2. Plenty of sources say that the tubing we use...
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    Ya, I would really like to keep the knuckles...

    Ya, I would really like to keep the knuckles inside my wheel so I don't have to extend them so far, which I really don't think is a good idea. The design posted here has a toe-base of 120mm (4.7").
    ...
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    Hey Ahmad. That sounds like good way to make...

    Hey Ahmad. That sounds like good way to make these. Should I use this design, I will likely waterjet steel and bend the shape, adding a flat plate at the right side. The curved surface is more...
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    Before I do FEA, let's get the preliminary design...

    Before I do FEA, let's get the preliminary design correct, and handle wall thicknesses and webbing later.

    Does this look like what people are suggesting I do to increase my toe-base? With 10-inch...
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    To properly apply forces to my bearing structure...

    To properly apply forces to my bearing structure in FEA, which I agree is where it should be applied, should I really be distributing the face along the whole circumference and depth of the hole, or...
  8. Thread: more on brakes

    by Joshkb
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    Just saw this thread...did you figure out your...

    Just saw this thread...did you figure out your calculations?

    Josh
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    Fyhr, How does your hub mount to your wheels?...

    Fyhr,

    How does your hub mount to your wheels? Is the left image missing a component (other than rotor)?

    Are you running 61816 bearings?

    Josh
  10. Please email me at joshkb@bu.edu interested ...

    Please email me at joshkb@bu.edu

    interested

    Josh
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    Thanks for the feedback Tromoly. Seems like the...

    Thanks for the feedback Tromoly. Seems like the simplest solution.

    Jay, I wish I could do FEA or just hand calcs for the caliper tabs in bending, due to the force from the caliper trying to center...
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    Image is very blurry: Top (red) value = 1.451...

    Image is very blurry:

    Top (red) value = 1.451 E8
    Bottom value (dark blue) = 1.449 E4
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    Back from exams... Here is an updated version...

    Back from exams...

    Here is an updated version of my upright. Main changes include an uneven spacing from bearing center to LCA and UCA connection points, thickening of bearing walls and walls that...
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    Z, 1 - The bearing inner races have a...

    Z,

    1 - The bearing inner races have a .0002-.0005" interference fit on our spindles. For our uprights, they have not been made, but we do not have an internal mic that large, so i'll have to...
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    Thank you for all of the feedback, everyone. ...

    Thank you for all of the feedback, everyone.

    The radius on the back of my rotor hat could have been larger, I agree.

    For the bearing shoulder on my hub, it is small to fit our rotor buttons. A...
  16. Thread: Brake Ducts

    by Joshkb
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    Make a drawing

    Make a drawing
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    Thanks Goost, very helpful. Let me try to address...

    Thanks Goost, very helpful. Let me try to address your comments:

    1 - The uprights havent been made and I agree, the added weight wouldnt be much so why not go stronger?

    2 - The idea here is...
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    Mitchell, thanks for your boot feedback. I agree...

    Mitchell, thanks for your boot feedback. I agree most FSAE boys are oversized and are not necessary. I'll consider your link.

    Z, no problem, I'm here to learn and make next year's team and car as...
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    Hubs with built-in tripod joint

    Hi guys,

    My name is Josh and I'm the president of Boston University Racing. This post is to share my design and manufacturing of our rear hubs, which have built-in tripod joints.

    Any feedback,...
  20. Thread: Bearing C/P

    by Joshkb
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    Bearing C/P

    Hi all,

    What "Safety factor" are most of you running on your hub bearings. I.E. Your bearing's DLC divided by a single bearing's expected radial load under max lateral acceleration. Particularly...
  21. Has anyone used Sens4speed RSL linear pots? They...

    Has anyone used Sens4speed RSL linear pots? They are $200.

    http://www.sens4speed.com/en/products/potentiometers/rsl-125mm_67.html

    Josh
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    Hey everyone, Thank you for your input. Our...

    Hey everyone,

    Thank you for your input. Our pedal guy has since made a new "prototype" box that's very cheap, easy to manufacture and very "basic", for lack of a better term. Everything works...
  23. Thread: RCV Hubs

    by Joshkb
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    apalrd, Thanks. I am very surprised that...

    apalrd,

    Thanks. I am very surprised that these hubs haven't had damage yet, not because they are poorly designed, but because I thought a year or two of use on ANY aluminum hub would cause...
  24. Thread: RCV Hubs

    by Joshkb
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    Thanks Ahmad. We certainly have the...

    Thanks Ahmad. We certainly have the manufacturing capabilities, but what worries me is using hardened inserts and knowing if they will be enough to transmit the power, versus an RCV steel hub or a...
  25. Thread: RCV Hubs

    by Joshkb
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    To clarify, I am referring to the driven hubs,...

    To clarify, I am referring to the driven hubs, not front (we run RWD).

    Josh
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