https://a360.co/2vqj5lD
Here is my first test, will 3D print tomorrow and see if I'm close or not.
Bengt
Den 2018-08-07 kl. 23:02, skrev Gene Heskett:
On Tuesday 07 August 2018 16:48:47 jeremy youngs wrote:
This brings up an argument against doing it aligned with an axis but
s/b aligned at 45 degrees so there is never an axis direction
reversal while the tool is within the material. Its been my
experience, with the quality of machine and ball screws I can
afford, that one can never get a completely invisible axis reversal
although I do have bearings seated in such carvings, carved on a
micro-mill after very carefully setting the XY axis's backlash.
Sure, lay it out and generate the code aligned with an axis just
because its easier that way, but mount the jaw holding vise at
nominally 45 degrees, measure its angle with a touch probe and sci
calculator, and rotate the co-ord map to match. That will move any
direction reversals to outside of the workpiece. Voila! Perfect
curves w/o any backlash artifacts.
But is you mill good enough to cut a spiral? Getting the g-code
is the easy part.
If you draw the spiral in cad, then choose a section of maximum
radius, and minimum radius that a jaw 'tooth' will traverse.
Now superimpose those two profiles and lop off any excess,
keeping only the intersecting area.
Repeat for all jaw 'teeth'
Then hand code the segment
Brilliant
Thanks for the flowers. :)
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