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Thread: Change Gears Again
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24th January 2011, 07:23 PM #46
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Something like this:
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24th January 2011, 09:11 PM #47
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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.
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24th January 2011, 10:14 PM #48
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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.
