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Experiment Engraving Machine Dials
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awemawson:
Mark, the last version that you saw was 'drag engraved' ie the cutter was not rotating and was just a 40 degree conical point pushed and pulled across the work. In the earlier example I used a high speed rotary engraver with a commercial carbide 'D bit' engraver which is 90 degree included angle.
RotarySMP:
Thanks. Looks really nice.

Mark
awemawson:
The more I look the more I find  :bugeye:

Watching the machine engraving another version I was looking at the displayed angle of the 4th axis incrementing away - 100 divisions over 360 degrees so why is it incrementing by 3.575 degrees and not 3.6

So I looked at the G code that it was obeying, and sure enough if you look at the difference between successive values for A they are 3.575 degrees apart as you can see in the attached file of G code
awemawson:
Much head scratching ensued  :scratch: :scratch: :scratch:

Much coffee consumed  :coffee: :coffee: :coffee:

But it wasn't until a period of awakeness at 3 o'clock this morning that it dawned on me. The wrapping program works out the extents of the code that it is wrapping in terms of maximum X and Y then applies it's clever mathematics. The lines to be engraved are fine and in the right places BUT THE ZERO DESCENDS BELOW THEM  :bang:

This means that the length of the wrap is wrong as half of the width of  '0' is added to the Y length as you can see in this picture:
awemawson:
The solution is trivial. add some lines below the zero, remove some lines at the other end of the scale and all should be hunky dory.  :ddb:

As per these pictures:
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