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Type: Posts; User: AlfaGTA

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  1. Replies
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    Sorry ,no clue, but i would wager that they are...

    Sorry ,no clue, but i would wager that they are German.....
    Cheers Ross
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    Dave: No I did not use any optical alignment ....

    Dave:
    No I did not use any optical alignment . Stuck with things i felt more comfortable with.
    Did all alignments mechanically. Test bars, indicators plus purpose built fixturing....

    An...
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    Posted this some time back. Thought some might be...

    Posted this some time back. Thought some might be interested in the short update.
    Entire lower end was finished for all machine work. Bearings fitted and all clearances checked.
    Rods assembled with...
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    In this case i don't...use the same indicator...

    In this case i don't...use the same indicator (Interapid) so i believe the error is balanced between the short and long setup.
    Have the same issues with the line boring machine setting the...
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    Thanos: The setup went like this.... First...

    Thanos:

    The setup went like this....
    First setup the case as far from the machine column as practical.
    Align the case using the crank as the reference , making the axis of the crank dead...
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    J: The auto folklore about the frame being...

    J:
    The auto folklore about the frame being pressurized was in effect a crack detection system. Don't know any of the details, but my guess is that it was nitrogen.


    T:
    Pretty sure that the...
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    The crank and gear are one, unlike the 30's Alfa...

    The crank and gear are one, unlike the 30's Alfa Romeo 8C engines which were built up with the center gear being bolted between the two half's of the crank...
    Tricky bit of work there....Got to work...
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    Depth at .001-.0015" on the diameter..... Cheers...

    Depth at .001-.0015" on the diameter.....
    Cheers Ross
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    Matt: Believe you have the concept...

    Matt:
    Believe you have the concept correct....The bar is an arc...not dead straight. But the center of rotation is still centered at the far end of the arc....
    Envision that the bar is made from...
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    Yes clay helps dampen the vibrations........

    Yes clay helps dampen the vibrations.....
    Tooling companies make "silent" bars....but they cost cubic money, and there is nothing this long in this diameter (2.5" or so)

    Might have noticed the...
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    Matt: Calculated droop just at .0032" in 20" of...

    Matt:
    Calculated droop just at .0032" in 20" of length.
    I was taking .001"/.0015" per pass.....
    Not going for a specific diameter, just a full contact clean plus several additional cuts to assure...
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    Need some long reach measuring tools for this...

    Need some long reach measuring tools for this sort of work.....

    https://www.practicalmachinist.com/vb/attachment.php?attachmentid=290470&d=1591114227

    Overall view of the layout after finishing...
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    One of the issues here is that because i can't...

    One of the issues here is that because i can't get the bar to retract fully, i can't indicate off the full length of the bar.
    So to get things in the correct position, the first order is to...
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    Long reach boring,FP4NC

    Bit slow here and folks seem a bit tense so though it might be nice to share a few shots of a job i am finishing up.
    Some time back i posted photos of the parts of a job i was given to straighten...
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