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I first tried making the split nut the way Gingery
describes in his book. I made the pattern that you see here and
cast it in Zinc. |
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This is what it ended up looking like. It
turned out...ok..., but it wasn't very good. Getting that piece of
threaded rod set perfectly straight inside of the mold is damn near impossible.
With the threaded portion of the split nut not perpendicular to the shaft, the
carriage would go one direction real easy and would bind up going the other.
I needed to do something else. |
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What I ended up doing was making a split nut from a piece of aluminum on a mill.
I dilled and tapped a hole through the middle of the piece and machined away
everything else pretty much how Gingery describes making the pattern. The
shaft is a cut-off bolt and the handle is made from a piece of round aluminum
with a cut-off bolt for the handle. I put some washers between the split
nut and the apron so that it wouldn't wiggle around as much and bind. Now
I can move the carriage up and down the ways easily :) |
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Here the split nut is in the disengaged postion. |
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