Missing part for my engine

Discussion in 'General Engine Discussion' started by DOC123, Nov 27, 2010.

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  1. Nov 27, 2010 #1

    DOC123

    DOC123

    DOC123

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    Dear All
    I am currently making a PMR Mill engine 3A as I am describing in this thread.
    http://www.homemodelenginemachinist.com/index.php?topic=11442.0

    I seem to have misplaced the bit of brass that is to be used to make the cross head. It is 3/16" thick and 3/4" square. I don't have any other brass that I can substitute and don't really want to buy more bar stock for this little piece as I have no local supplier and all of my metal has to be mailed.
    I have steel, aluminium and cast iron of a suitable size to make the piece. The cross head slides in an aluminium track visible in the first pic in the above thread.
    I thought that using al on al probably isn't a great idea.
    What would be the best metal to use?

    Thanks
     
  2. Nov 27, 2010 #2

    gbritnell

    gbritnell

    gbritnell

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    From what you have available I would go with the cast iron. Anything other than aluminum on aluminum although the cast aluminum in the kit is a different composition than using bar aluminum.
    gbritnell
     
  3. Nov 27, 2010 #3

    jonesie

    jonesie

    jonesie

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    i also would go with the cast iron,just make sure you have a good slip fit and that you break all the shape edges and corners,and i would emery paper it smooth and it should work fine. i wold also make sure you do not have any sharp corners in the casting. good luck. jonersie
     
  4. Nov 27, 2010 #4

    rleete

    rleete

    rleete

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    Contact PMR. Chances are, they'll send you a new piece for free, or maybe a small handling charge.

    That's one of the benefits of dealing with a good company - they'll do quite a bit to make sure you are a satisfied customer.
     

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