Saturday, September 30, 2006
Tommelise sliding thrust collar under construction...
I designed a crude thrust collar which would let the coupling nut move in the x-y plane. This consisted of a poplar sleeve that let the coupling nut move freely in the y direction and guides, also done in poplar, that let that sleeve move in the x direction.
The thrust collar had to more or less match the width of the coupling nut (1 in) which entailed me gluing two strips of poplar together. You can see this assembly drying in the first photo.
At that point I carved seatings for the guide rods out of poplar and glued them to the 320x320 mm double strength glass work surface.
In the second photo you can see them glued in place along with the guides for the thust sleeve. Fender washers keep the coupling nut from slipping along the z-axis.
I got a bit overexcited and tried to run it this evening instead of letting the glue dry overnight. The thrust collar appears to do what I'd intended, that is, to keep lateral movements by the theaded drive rod from reaching the guide rods and requiring dissapation as friction heat.
I was able to run it for about a minute before one of the glued joints came loose. I reglued everything and resolved that video clips of the z-axis platform will wait until tomorrow morning. :-s
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