Y axis spacer
While the X axis motor mount gets attached directly to the right side of the moving table, the Y axis motor mount connects to a spacer block, which in turn connects to the front face of the moving table.
As always, the process started with a rough piece of metal that had to be cut down to its plan dimensions, and squared.
Raw material |
Squaring one side |
insert surfacing video
Finished stock |
With the stock now in a usable form, I reproduced the bolt holes, and the ballscrew pass-through hole onto the part.
Locating the Y axis with an edge finder
Holes center-drilled |
1/4" holes drilled all the way through |
Reaming the ball-screw pass through hole |
The spacer houses two sets of bearings whose purpose is to support and guide the ballscrew.
As you can imagine, the tolerances are getting much closer for the bearing surfaces, and a slow and methodical approach to their milling was necessary. I chose to use a boring bar held in a boring head to machine these countersunk surfaces.
Boring head set |
The boring head is a fantastic tool, capable of high precision IF you know how to use it. I knew how, in theory, but the few times I had the opportunity to actually employ it, I was not very happy with the results.
However, I was eager and hopeful to experiment with different cutting surface angles, feed rates, and depths of cut, and this time around I got a lot better results, indicating that either my technique is indeed improving, or that I just lucked out. More boring practice will be required to settle this argument.
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