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  1. #46
    Join Date
    May 2010
    Location
    Lower Lakes SA
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    58
    Posts
    2,607

    Default

    Something like this:

  2. #47
    Join Date
    Apr 2009
    Location
    Kingswood
    Posts
    930

    Default

    Bryan,
    I did try to post with a copy of my spreadsheet(just love computers !), but yours is the same as mine.
    Note that for the nominated metric threads, the errors are plus/minus.
    I tried 61 and 59 teeth with the obvious systematic error one way or the other,
    You are on to a solution now, leave it with you.

    One thing, however, intrigues me; the presence of the 70 gear.
    Is it possible that the 70 gear is part of the metric set ?
    If 70 gear was on the QC input, the compound would have to be adjusted.
    Instead of N/60 it would be N/(60x40/70) = N/34.2, say 34 teeth.

    I have attached my spreadsheet showing the result.
    Some better, some worse.
    But, you can set it on the banjo/quadrant no problem.
    The N/34 with N meshed to 70 could be the original design intent.

    John.

  3. #48
    Join Date
    May 2010
    Location
    Lower Lakes SA
    Age
    58
    Posts
    2,607

    Default

    John, all I can tell you about the 70 is that it's intended to be an idler. It has no keyway or dowel hole or any way to drive anything.

    That's a neat way to show the errors. I copied that on mine and got no more than .54%. Pretty happy with that. I also expanded the highlighting. Those two tables will cover diameters from 5-36 in coarse and 4-100 in fine. Oughta do me.

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