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Straight Axle Steering Geometry - Slightly Off Topic

Discussion in 'The Antiquated' started by Black_Sheep, Nov 3, 2019.

  1. Black_Sheep
    Joined: May 22, 2010
    Posts: 1,466

    Black_Sheep
    Member

    D80FFF49-AA71-428B-AEC7-CB6700EC8277.jpeg I’m in the preliminary stages of converting an old pedal car into a stroller so my grandkids can enjoy car shows and cruise nights in style. I would like the front wheels to turn for the sake of maneuverability. Any ideas on how much caster is needed for the wheels to return to center? Planning to build a straight axle with no suspension...
     
    Okie Pete likes this.
  2. 55styleliner
    Joined: May 11, 2015
    Posts: 563

    55styleliner
    Member

    As light as it’s going to be I’d use 15 degrees.
     
    Black_Sheep likes this.
  3. 2OLD2FAST
    Joined: Feb 3, 2010
    Posts: 5,262

    2OLD2FAST
    Member
    from illinois

    King pin inclination is at at least , if not more important , in getting the wheels to return ...
     
    Black_Sheep likes this.
  4. squirrel
    Joined: Sep 23, 2004
    Posts: 56,084

    squirrel
    Member

    If the front wheels are that wide, they won't be able to turn very far, and it will be a bitch to maneuver the stroller, without tipping it back (so the front wheels are off the ground).

    they build strollers with small wheels, for a reason :)
     

  5. DIYGUY
    Joined: Sep 8, 2015
    Posts: 883

    DIYGUY
    Member
    from West, TX

    How about a wagon instead?
     
  6. Black_Sheep
    Joined: May 22, 2010
    Posts: 1,466

    Black_Sheep
    Member

    I am planning to follow conventional guidelines for kingpin axis inclination
     
  7. 2OLD2FAST
    Joined: Feb 3, 2010
    Posts: 5,262

    2OLD2FAST
    Member
    from illinois

    Unless you can get your " pushbar" above or slightly forward of the rear wheels , " steering" it from behind will be difficult at best ...
     
  8. jaw22w
    Joined: Mar 2, 2013
    Posts: 1,676

    jaw22w
    Member
    from Indiana

    I know it's not the look you are going for, but if you don't put swiveling casters on the front, just like a normal stroller, it will be a bitch to push in any direction but straight.
     
  9. Oh shit......Time to rethink this........ image1.jpeg
     
  10. Okie Pete
    Joined: Oct 29, 2008
    Posts: 5,036

    Okie Pete
    ALLIANCE MEMBER

    Kool projects Black Sheep and jimi932
     
  11. this might work.......
    drive-nitro-4-wheel-rollator-8.jpg
     
    lothiandon1940 likes this.
  12. wvenfield
    Joined: Nov 23, 2006
    Posts: 5,584

    wvenfield
    Member

    Black_Sheep likes this.
  13. Me too. This is also 1962! Mine had more Patina...LOL

    IMG_4856.JPG
     
  14. Black_Sheep
    Joined: May 22, 2010
    Posts: 1,466

    Black_Sheep
    Member

    Thanks! Everything I have read about steering design in the past week or so says the same thing. I drew it out to scale with 0 camber and 0 scrub radius, KPI will need to be 27 degrees due to the amount of wheel offset. I don't think a lot of caster will be necessary for the wheels to track straight. The axle will be round and held in place with saddle type exhaust clamps so the axle can be rotated to dial in caster.

    Worst case scenario is that it doesn't work and I go the route jim1932 suggested. I was looking at the front wheels on the kids Little Tykes car, the swivels are super simple and would be fairly easy to duplicate.
     
  15. bill gruendeman
    Joined: Jun 18, 2019
    Posts: 833

    bill gruendeman
    Member

    8AE1F8DC-0F0C-4DBC-9852-2D5A0AF41693.png A6AE33BE-2C7F-4544-8F3E-6E963163D32F.jpeg Mark this is how I am doing mine, not a straight axle, but a idea . It will be pulled not pushed, so i don’t have to worry about self centering
     
  16. Black_Sheep
    Joined: May 22, 2010
    Posts: 1,466

    Black_Sheep
    Member

    That's cool Bill!

    My grandson is pretty young so I prefer this to be pushed so I can keep tabs on him while moving. Parts are being gathered up and I have a shopping list for Discount Steel so I can start building axles and a frame.

    Stainless shot glasses for injector stacks
    81qVWx3GnVL._AC_SL1500_.jpg
    Steering wheel
    75424786_2469437963093670_4227042023141539840_o.jpg
     
    bill gruendeman and Shadow Creek like this.
  17. bill gruendeman
    Joined: Jun 18, 2019
    Posts: 833

    bill gruendeman
    Member

    Can't wait to see it done, we will have to have a grandpa race.
     
  18. Black_Sheep
    Joined: May 22, 2010
    Posts: 1,466

    Black_Sheep
    Member

    You’re on!

    I hope to get over to Discount Steel this week with my list of materials, the project is stalled until I do...
     
    bill gruendeman likes this.
  19. Black_Sheep
    Joined: May 22, 2010
    Posts: 1,466

    Black_Sheep
    Member

    0CDCE838-181B-4C8F-8358-80C41A94A640.jpeg The bushings and thrust bearings for the front spindles showed up today, one step closer. My buddy is machining some 5/8" ID DOM tubing, the bushings will go in each end and a thrust bearing and washers will go on top. Everything is 1/2" ID so I can use a steel pin as a "kingpin". The pieces in the background are hinge butts for a semi trailer that I dug out of my big bucket o' junk. They will be welded to a tube to make the axle. With the bushings and thrust bearings the wheels should turn pretty easy.
     
    Last edited: Nov 19, 2019
    Shadow Creek likes this.

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