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  1. dfoxengr

    CR 12L14 internal stresses causing bowing after machining shaft

    Yes they are cold drawn bars. Thank you all for the suggestions.
  2. dfoxengr

    CR 12L14 internal stresses causing bowing after machining shaft

    I am having some issues with keeping a machined 12L14 shaft straight after machining. The shafe is about 3/8" and a flat of over half the diameter is machined out of a section of the shaft in order to create a spot for a plate to rest on. While not being the best idea to cut over half the mat'l...
  3. dfoxengr

    transfer case: no option of engaging 4 X 2 (low speed mode)

    as someone said. to help even out the loading, plus 99.99% of people would never use it. there are always mechanical or electrical means of bypassing this safety feature though. locked hubs or some vacuum bypass for mechanical, and then there are electrical means that are fairly simply to...
  4. dfoxengr

    LCA angle towards rear question

    Oops is there a delete, lol. I believe I mistyped. What i was getting at is that yes the ball joint moves in side view slightly with respect to the LCA axis. but by and large SVSA is controlled by angles of the LCA and UCA axes to eachother, but passing through the ball joints. So I dont see...
  5. dfoxengr

    LCA angle towards rear question

    SVSA to my knowledge is not controlled by ball joints.
  6. dfoxengr

    Load transferring shaft on control arm - material?

    can you post a picture of the current setup instead?
  7. dfoxengr

    LCA angle towards rear question

    no, bump steer /= ackerman steering
  8. dfoxengr

    LCA angle towards rear question

    please tell us what book that is. I might have it. also the camber change should be explained not as an angle change of the wishbone in plan, but the outward movement of the upright's balljoint, for clarity
  9. dfoxengr

    LCA angle towards rear question

    Right I believe what Greg and I are alluding to is that a complete 3 view drawing is required to ascertain more about the design.
  10. dfoxengr

    LCA angle towards rear question

    again, probably not anti-squat since the zonda's view in plan (top). quickly looking at it would say it is going to toe out on bump, so that the outside wheel in a turn gains toe out. also on launch added toe which could be used to increase traction due to a higher slip angle. many...
  11. dfoxengr

    Bosch LapSim Tire model

    please do post your matlab gui, and other code.
  12. dfoxengr

    LCA angle towards rear question

    Front lower 0\ /0 Front upper 0| |0 excuse me but this is a top view of what it seems the OP is referring to. the 0 is the tire while the lines are the axes of the control arms.
  13. dfoxengr

    LCA angle towards rear question

    I was sure that anti geometries were solely side view kinematics. From RCVD "[the anti effect] It results purely from the angle or slope of the side view swing arm." pg. 617. Basically it is the reaction that the suspension links take on as a result of braking (and their angle w.r.t. the CG)...
  14. dfoxengr

    LCA angle towards rear question

    anti-dive is a side view geometry, no?
  15. dfoxengr

    Small superflow bench scaling and correlation to larger bench

    after some searching I used eqn. 6 here: http://en.wikipedia.org/wiki/Orifice_plate used my known small bench data (mass flow rate,k, and pressure ratio) to coefficients (C*A*sqrt(2M/ZR)) in one variable "X" then I resolved using this "X" and a new pressure ratio to get a new mass flow rate...
  16. dfoxengr

    Pros and cons of 8*8 against 6*6 wheeled vehicles

    there are some road profiles and of course half rounds that are US Mil standards. Look for aberdeen and NATC documents. Aside from the model, look at some video of 6x6 and 8x8 mil vehicles riding on courses if you can find any. The 8x8's that I have seen basically just glise all over the...
  17. dfoxengr

    LCA angle towards rear question

    so from side view the front pivot is lower than the rear pivot on the LCA? sorry i dont understand the description.
  18. dfoxengr

    Sway bar or not?

    "Sway bars can significantly improve the contact patch of the tire while cornering because it reduces the car from swaying like a boat. Your suspension becomes predictable and allows for fine tuning from one track to another." Pretty sure the ARB will decrease the available grip at that axle by...
  19. dfoxengr

    Trailer Rollover

    the stiffness of the suspension is almost a non-issue since lateral migration of the CG in roll is probably a very small component of the overturning moment on the trailer. as someone said, if full or well baffled, calculate the (cg height)/(track width) as a non-dimensional number and compare...
  20. dfoxengr

    Bosch LapSim Tire model

    looks like he was probably referring to a pacejka model which can be derived from empirical test data from a flat track machine or some road testing. the model is probably slip angle/lat force, camber/lat force, etc

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