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When is a Model A drum under size?

Discussion in 'The Hokey Ass Message Board' started by Brendan1959, Feb 15, 2009.

  1. Brendan1959
    Joined: Jun 26, 2008
    Posts: 288

    Brendan1959
    Member

    Can someone tell me what thickness a model A drum can be machined too befor its under size.
    Thanks
    Brendan
     

  2. You mean Oversize ?
     
  3. Brendan1959
    Joined: Jun 26, 2008
    Posts: 288

    Brendan1959
    Member

    You say potatoe I say patio or something like that, when are they ready for the bin.
     
  4. 4ever4
    Joined: Nov 8, 2007
    Posts: 11

    4ever4
    Member
    from Texas

    Cast iron --or stamped steel? Cast iron can go .050" safely. The stamped steel are not supposed to be machined. Consider using new cast iron drums that look like the original drums.
     

  5. mbshafter
    Joined: Jan 26, 2008
    Posts: 48

    mbshafter
    Member
    from Detroit

    The minimum "safe" wall thickness for steel drums is .120". Anything less than that I throw on the scrap pile.
     
  6. Brendan1959
    Joined: Jun 26, 2008
    Posts: 288

    Brendan1959
    Member

    Thanks
    .120 now I have some thing to look for.
    Brendan
     
  7. fiftyv8
    Joined: Mar 11, 2007
    Posts: 5,157

    fiftyv8
    Member
    from CO & WA

    Bredan the trouble with model A sheet metal brake drums is that they get hot and distort under heavy braking and expand out so they become more over sized than when cold so you loose your brake shoe adjustment when hot.
    If you want mechanical brake may I suggest you find yourself a 1935 front axle complete and install it onto the model A radius rods, that way you get a lower front, open cast iron brake drums and slightly bigger diameter drums, just need to make a steering arm to go onto the spindle.
    All the lever will do right up.
     

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