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3d indicator design

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BillTodd:

--- Quote from: Topos on April 20, 2012, 09:45:43 AM ---Add my standing Ovation to a super presentation of a wonderful design. :clap:

--- End quote ---

Thanks  :)  :beer:

The thrust washers and bearing balls have arrived, and I finished re-painting the kitchen so, hopefully, I'll get a start on the prototype this weekend.

I've decided to screw the probe into the with a M4 thread since this suits commonly available  Renishaw probes (and I happen to have one here) . I still have yet to come up with a simple locking mechanism so a tommy-bar will have to do.

Bill

BillTodd:
Interruptions, interruptions...  :bang:

only managed to get a few bits made.  Not too happy about the finish on the mounting shaft, sizes are OK but  too many rpms on the finishing pass left banded marks.

The 45° cone was easier to cut that I expected , I was able to use a tiny boring bar to enlarge and finish after a an initial cut with a 45° spotting drill.

More tomorrow...

BillTodd:
Made the upper taper and lapped  it into the main shaft. The two cones work as expected :)

The two ball cages were a bit of a disaster - I forgot to change the design (PCD of the ball holes) when changed it to use larger thrust washers  :scratch:  so the balls fell out when assembled  :hammer:

Also, real world tolerances of the thrust washers  (20.7 diameter instead of 21 with a 0.2 bevel on the edges etc.) mean that the over-lap between the washers is smaller than expected, leaving the slide a little short of travel (I am aiming at 4mm in all directions). So, although I had hoped to use standard parts, I may have to make the thrust washers myself :(

Bill

BillTodd:
Made the larger thrust washers from stainless steel (after three attempts!) - just need to lap the surface to a good finish.

Made the body from a piece of 40mm aluminium bar.

I still have to make the correct sized  bearing cages and the DTI mount.

BillTodd:
Made the DTI mount and pressed it into the body, then spent all afternoon and most of this evening wondering why the mount hole is in the wrong place...

..slightly ironically,  given that I'm making and edge detector,  it's because I forgot to subtract 2mm from the DRO when I set the edge of the vice with the (4mm) edge detector .  :doh: :doh: :doh:

Never mind, I'll just have to bore the body 2mm deeper and reposition the cir-clip groove.

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